700r4-transmission

700r4 Transmission Specifications, Identification & Information

In Transmission by Josh S22 CommentsLast Updated: February 5th, 2019

700r4 transmissionSo you are looking for information and specs of the 700r4 transmission on the web?

So did I, and I couldn’t find any useful or relevant information about this common transmission.

That’s why I decided to write this guide for you about the 700r4 transmission. This is a widespread transmission on GM/Chevy cars, and I’m shocked about the lack of information out there, so I did go through a lot of websites and books to collect all the information you probably need about this transmission in a single blog post.

I hope you like the information and if you have any other questions, leave a question in the comment field at the bottom of the article, and I will answer your questions as soon as possible.

700r4 Transmission Specifications Chart

Name7004r
Type4 Speed Automatic
ApplicationsGM Cars - GMC, Chevy/Chevrolet, Buick 1982-1990

Blazer, Suburban, Camaro, Corvette, Impala, Oldsmobile 350 and more
Gears3 + 1 Overdrive 30%
Weight170 lbs dry~
Lenght23.5"
Gear Ratios1: 3.059
2: 1.625
3: 1.00
4: 0.696
R: 2.294
Case MaterialAluminum
Input Spline-1984 27 splines

1984- 30 splines
Fluid Capacity11 Quarts
Fluid TypeDEXRON VI
Max Torque350nm +/-
Image700r4 transmission
Gasket/Bolt Pattern16 bolt

700r4 gasket
Name Before-1982 TH350
Name After1990- 4L60

700r4 General Information

700R4

So what is exactly a 700r4 transmission? Well. The 700r4 Transmission came in the year of 1982. The 700r4 and the 200-R4 transmission replaced the TH350 transmission at that year. The TH350 was a 3 geared transmission without the last overdrive gear. The 700r4 was a big upgrade with an additional gear (Overdrive), the 1st and 2nd gear became longer, and the transmission case itself became a bit longer.

You usually do find the 700r4 transmission in GM cars like Chevy Blazer, Suburban, Camaro, Corvette, Impala and even in Oldsmobile Cars with a lot more. To mention all cars this transmission was fitted in; the list would be very long.

A lot of people like the 700r4 because of the excellent durability. It is also effortless to find replacement parts for this transmission. The 700r4 transmission was not electronically controlled yet; it was hydraulic pressure controlled with a TV cable which acted as a throttle position sensor to control the gear shifting. In 1991~ the 700r4 transmission was replaced by the popular transmission 4L60.

The transmission did then became electronic controlled instead of the TV cable, with some other changes which I will go through further down in the article.

So for a summary, the 700r4 transmission was a 4-geared hydraulic automatic transmission with the 4th gear which was an overdrive gear (30% increase). The transmission was made between 1982-1992. It had a case length of 23.5″~ and weight of a 170 lbs~ without fluid inside it.

The recommended transmission fluid is Dextron VI with a capacity of 11 Quarts. The transmission case had 16 bolts and a transfer case of aluminum. The transmission is pretty reliable and can handle torque up to around 350nm~, remember that this is only reported numbers and it can differ a bit.

K-Case Differences

A lot of you reported and wondered what the differences are between a k-case and the typical case for the 700r4 transmission. The name “K-case”, came because the transmission case was stamped with a “K”. The K-case 700r4 transmission had a thicker transfer case and were stronger because it was made for the heavier 4×4 trucks. You would find these in the 1980’s trucks, and this transmission was very coveted because of the strength by the 4×4 offroad-community.

How to identify a 700r4 Transmission?

The most of the GM automatic transmission looked almost identical and were difficult to identify for an untrained eye. However, there are some ways to determine if you have a 200-4r, 700r4, TH350 or a 4L60 transmission.

Transfer Case Gasket Bolt Pattern

700r4 gasketThe easiest way to identify if you have a 700r4 is raising your car and checking the bolts around the transfer case. The 700r4 and the 4L60 transmission uses a bolt pattern of 16 bolts, so if the transmission looks like one of the pictures above and you can see 16 bolts, you do most likely have a 700r4 or a 4L60 transmission. So how can you know which one of these you have?

Well, the 700r4 use a TV cable as the speedometer, and the 4L60 is an electronically controlled transmission, so if you see wires coming to the transmission on the rear of the transmission on the passenger side, you have a 4L60.

Identification tag

700r4 identification tagThe safest way of checking your transmission is to look at the identification tag on the transmission. You will find it on the rear side of the transmission on the passenger side. On older cars, it can be pretty tough to see so you may have to clean up your transmission to find it.

If you can see it correctly, you will find an identification number of 7-8 letters and numbers.

1st number is the year model of the transmission. For example, if the number is 0, the transmission is from 1990. But it’s not that easy, because the transmission was made in the 1980s also. So you have to check the next letters of the.

2 letters 80's3 letters 80's3 letters 90's  
9 = 19826 = 19860 = 1990
3 = 19837 = 19871 = 1991
4 = 19848 = 19882 = 1992
5 = 19859 = 19993 = 1993

Next 2 or 3 letters identifies the model of the transmission. These numbers tell us the application, engine size, wiring type, and solenoids.

If you find 2 letters, The transmission is made between 1982-1985.

If you find 3 letters, the transmission is made between 1986-1993.

The last way to identify if it’s a 4L60 or a 700r4 is to look at the rear of the transmission for the Aux TV Cable or wirings as discussed before.

Wirings = 4L60

Aux TV Cable = 700r4

The last numbers and letters indicated the manufacturer date, rebuild date, plant of manufacturing and serial number.

This is everything you should need to identify your transmission correctly if you still have questions about it you are welcome to comment in the comment section at the bottom of your article and ask your questions.

700r4 Troubleshooting Guide

Even if the 700r4 transmission was pretty durable and reliable, they do sometimes fail. We have to remember that these transmissions are old and old things do often fail at some time. I work as a diagnostic technician, and I’m solving problems with cars all days long.

Here I will write some common symptoms of the 700r4 Transmission and will write a short line underneath it to explain where you should start looking.

1. Torque Converter won’t lock and slipping

When your 700r4 Transmission is slipping or won’t lock, it’s most likely a problem with the converter inside the transmission. However, the first thing you always should to when your transmission is slipping is to replace the transmission fluid and to flush the transmission. So the first thing I could recommend is to check the transmission fluid level.

700r4 Transmission Fluid Level Checking

Let the transmission fluid became hot and let your car idle at Park while you are checking the dipstick. If the fluid level is low, try to fill it up to see if it solves the problem.

If you find out that the transmission fluid looks dark red, brown or even black, it’s time to replace the transmission fluid and flush your transmission. However if the transmission fluid seems good, and the converter is slipping I do still recommend you to replace the fluid and do a transmission flush.

There could be a problem with the converter itself which may need a replacement. Other causes could be due to the adjustment of the TV cable, which I will discuss further down.

2. Revs up but won’t move

If your car revs up, but it will barely move, you should start with checking the transmission fluid as discussed before. Check the level and the color of the transmission fluid.

Red = Okay
Brown = Worn out
Black = Burned

If the fluid seems okay, it’s time to check the adjustment of your TV cable between the transmission and the throttle body. I have included a movie to simplify the procedure of the TV cable adjustment. You should also make sure that the switch on the brake panel is working properly.

700r4 TV/Aux Cable Adjustment

700R4 TV (throttle valve) Cable Adjustment

3. The speedometer is not working properly

If your speedometer is not working, there are two different variants you have to know about before starting the troubleshooting. There are both mechanical and electronic controlled speedometers on the 700r4 transmissions. First, you have to check if you have a mechanical or electronic speedometer. 

If you raise the car and take a look at the area around the rear of the transmission if the cable coming out of it is pretty thick with a big circle that screws into it, you have a mechanical speedometer, and if you find a speedometer sensor, you have an electronic speedometer.

If you have a mechanical speedometer – Check if you can see any problems with the speedometer wire, replace it if you can look at any signs of worn or other damages. These wires can jump out from the dashboard cluster sometimes, so make sure its installed correctly.

If you have an electronic speedometer – Check the wirings between the cluster/control unit and the transmission and make sure there is no corrosion inside the connector. If the wires are okay, it’s time to replace the sensor on the transmission. If the problem still insists, there might be a problem with your instrument cluster.

4. Vibrations on acceleration

If you are feeling vibrations in while you are accelerating with your car, there is most likely a problem with the driveshafts, prop shaft or the torque converter. If you are feeling vibrations at all the time and not only on acceleration, you may have unbalanced tires.

5. Not shifting properly

If your transmission is not shifting correctly, you might want to check the TV cable adjustment as discussed before. Also, check the transmission fluid level and replace it if it’s worn.

Common 700r4 Problems

There are some common problems that you always should check first when you are troubleshooting your 700r4 transmission.

The Switch at the brake pedal: There is a switch on the brake pedal which you want to check the function of to make sure it works correctly. There are two different variants of these, either its a combined switch with the brake switch and cruise control switch, or there are several separated switches. Check the wirings diagram and make sure the switch is working correctly and make sure you get voltage to the switch.

Worn out TV cable/Adjustment. A worn out TV cable or a faulty adjustment is another common problem on the 700r4 transmission. Make sure to adjust the TV cable with the help of the video a bit higher up in this article. If you can see any signs of worn out or damages on the TV cable, Replace it!

Low fluid level/burned fluid The 700r4 transmissions are sometimes leaking which can cause low transmission fluid levels which you always want to make sure is okay. Some transmission has gone a lot of years without a transmission fluid change also, which can cause damages inside the transmission. Check the fluid level and replace and flush the transmission fluid if it looks dirty.

Faulty Converter. Sometimes the torque converter can fail on the 700r4 transmission, unfortunately. These are often pretty expensive and you need some skills to replace these. If you have done everything above and the transmission is still slipping, you might have to replace it. There are some videos on youtube on how to replace the 700r4 converter.

700r4 Teardown Film

To understand a bit more about the function of the 700r4 transmission to make your troubleshooting simpler, I have included a teardown film of the 700r4 transmission which might give you a clue about how the things are working inside the transmission.

700r4 Transmissions for Sale

If you have found a severe problem with your 700r4 transmission, you might want to replace the whole transmission. Because it’s a popular transmission, the parts for the transmission are pretty cheap both new and used, and you can find both used and new transmissions for a reasonable price.

However, if you are going to replace parts for your transmission, I do always recommend you to install new components and never install used parts if possible. Remember that most of these transmissions are old and are starting getting worn out and the price for new parts are not very high.

Brand New Transmissions & Parts

If you are looking for either just any parts for your 700r4 transmission or are looking for a brand new transmission, I can recommend you to check it out on Amazon if you live in the USA or Europe. There are a lot of new parts there for this transmission, and most of them are pretty high quality.

Check the recent customer reviews of the part to get a clue of the quality of the product. To see the parts you can go to Amazon either by clicking Here700r4 Transmission Specifications, Identification & Information or checking the ad down below.


Used

If you are looking for used transmissions, you can either find them online or because they are pretty standard, you can probably find them on any junkyard near you. Remember to check the transmission closely before you are making your purchase. Try to get as much information as possible about it, like the mileage, how many transmission fluid replacements were done, etc.

Conclusion

I guess you do now have got a clue about what the 700r4 transmission is and how it works. If you still have any questions about the transmissions you are welcome to write your questions in the comment field down below and I will answer it as soon as possible.

I’m going to write more reviews about different swaps and conversions between these transmissions, but write your question, and I will try to write an article about the topic. I hope you enjoyed the information, see you in the next article!

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Comments

  1. First off, thanks for all the great information. Is there a site somewhere to fully decode the Identification Number? I have one installed in my 1969 C-10 and I’m sure it is not original, but am very curious as to what vehicle it was originally installed.

    I also noticed here under Common Problems. It says

    “Faulty Converter. Sometimes the catalytic converter can fail on the 700r4 transmission, unfortunately.”

    I’m thinking instead of Catalytic Converter, you mean Torque Converter?

    Thanks again for the great information.

    1. Author

      Thanks for your input! I have also searched for a full decoding software for the identification number, without success, unfortunately. If I do find one, I will link to it!

      Oh yes, it should be torque converter, edited thanks for your report!

  2. I have a 1991 Chevrolet Silverado with a leak around some electrical part on my transmission or drive shaft. Can you tell me what part I would need to replace to stop the leaking? I have a picture of it but not sure how I could send it to you. I am a 55 year old female who trusted a so called Chevrolet mechanic, and all he did was cause me more problems. I need some help!! Thank You!!

    1. Author

      If the driveshaft is leaking, you have to make sure that the breathing is okay in the transmission and replace the rear driveshaft seal. If there is an electric part that is leaking, there is a seal there too which have to get replaced or sealed 🙂

  3. hello, I have a corvette with the 700r4 gearbox, the fourth gear runs at 130 km / h is normal?
    the TV cable has been changed and adjusted, oil is perfect, can it be the governor? thank you so much…

    1. Author

      To me it sounds normal, does it feel like the transmission is slipping while you press the accelerator pedal?

  4. Great information! Thank you for taking the time to share!!

    I have a 1990 700r4 in a hot rod and 1st gear holds out till around 2800 rpms before it shifts.
    This is being easy on the throttle.
    I actually unhooked the tv cable and took around the block being easy on the throttle. Still held 1st to 2800 rpms.

    I do have the edelbrock correction lever coming for carb.
    With this information what could cause these symptoms?

    Also,… was watching video on adding the lockup kit.
    They showed the 4 TH gear port by a round cover on pass side to put switch in. I don’t see this on my trans.

  5. Hello I have a 1985 K5 Blazer with a 6.2 diesel.
    My question is do I need to get a 6 bolt torque converter to go with my 700r transmission? Or should I use a 3 bolt torque converter?
    The problem is that I had my transmission rebuilt and it was driving fine until I punched it on the freeway way and it slowed down and it started sounding like bad lifters. So I pulled over and turned off the truck. Then I restarted the truck again and the noise went away. I took of driving and I punched it again and it drove fine. And after a half mile it started doing the same thing again. And it lost power.
    I turned the truck off again and restarted it. While driving around 30 to 40 miles an hour is fine. No problems until I get to high speeds.
    Right know I have a 3 bolt torque converter.
    So my question is should I get a new 6 bolt torque converter or a 3 bolt torque converter.
    Thank you in advance
    Mel

  6. Im converting column shift PRND21 to B&M floor shift PRND321 in my 1971 Chevy C10 which has a 700R4 transmission. I cannot get the shifting lever and transmission actual gear position to match. Now I’m confused as to how the stock column shift with 3 speed settings worked, and why the B&M 4 speed settings won’t work.

  7. Hei , My name is Magnar and i live in Norway. I have a Corvette c3 modell 1978. The gearbox in this car is aTH7004TH R 4 Preppet for 502
    It is standing a number at the side on the transmission . nr 8676359 and it is stamt a big K on the side of it
    I bought this Trasmission new in 2009 and the motor in the car is a 383 With 450 horspower
    Could you tell mee the part number at the filter kit for this transmission.
    If you could help mee i vil bee very greatfull
    I am not so good in Your Language but i hope you understand mee, It is about 45 years agoe sins i vas at scool for to try to loern somthing

  8. I put Dexron 3 instead of Dexron 6 transmission fluid in my transmission what problems is it going to create

  9. Liked your comments on the 700r4. I have the early 700 in a 82 corvette. It has been modified with Kevlar clutch pack, better shell, 30 spline input shaft, TransGo shift kit and a few other mods that I don’t remember. The trans seems to shift fine and 1st to 2nd is firm, not violent, 3rd is OK as well and sometimes going into 4th is a tad slower than I would like, but I hardly use 4th/OD. However, when at WOT it does not shift by 6,000rpm and I have to lift off to make it shift. The governor also has lighter weights and maybe springs? Would the governor be the first place to look at? Any other comments on for sure things to look at would be appreciated. Thank you.

  10. Author

    Because of high demand and a high amount of comments, I do not have time to answer these specific transmission questions that require a lot of research to be answered correctly right now. I will come back to these later.

    If you have a problem with the 700r4 transmission shifting, check out the cable TV adjustment after this guide: http://static.summitracing.com/global/images/instructions/700r4%20cable%20adjustment%20instructions.pdf

    If you have specific questions that you need answers for fast and correct, you can ask a certified master technician here:
    https://mechanicbase.com/ask-a-mechanic/

  11. Great read and reattach on your part I just purchased one to replace into my which lost overdrive. It used to vibrate when going into over due so I’m thinking it was to torque converter now.

  12. I have a 1995 Chevy Silverado pickup truck 4×4 I am trying to identify the transmission it has a big K on the side of the transmission. Also it has an electrical plug in on the passenger side of the transmission .can you tell me what transmission it is ?

    1. Lots of good info here -thanks . I have a friend/customer coming in next week with a problem he Hope’s could be TV cable adjustment . But I haven’t seen it yet and have my doubts. The car is an old street car and has a old 3.0 rear gear ratio, the first 50 -60 miles it’s fine after that going at highway speeds it can’t stay in hi gear but goes between hi and 3rd gear back and forth. Always the same to. Thanks in advance. Rog.

  13. I have a 1970 oldsmobile 455, is there an easy way to tell if a 700r4 is a unibolt version or Chevy only? I’m trying to put one in my car so I have overdrive but finding one has become a bit of a headache because idk which ones are which and most people tend to tell you what they think you wanna hear when they are selling them. Also are there different size bellhousings on them because I’ve seen some people post that theirs has a small bellhousing. Thanks

  14. Hi Josh , Great write up … I just bought a 89 model Chevy Truck with a 350 and the 700R4. The thing has very late shifts, hits 2nd gear at about 50 mph and if you stop throttling up before the shift takes place it goes into free wheel and will slip until you let off the throttle again and make a new attempt at the 50 mph shift. Is the Tranny junk or just the T/V cable out of wack, or is there a governor with the centrifugal weights giving me fits?

  15. Do you have a printable copy of the schematics to do a full rebuild of 700R4 I have an 1987 GMC s15 Sierra classic pickup truck and I would like to learn how to rebuild it

  16. Great info!! learned a lot! My problem is this – i have a bbc with 700r4 in my 1970 Chevy 3/4 ton pu. when it shifts from 3rd to 4th at around 35-40 mph i lose accelerator power. it seems as if the tranny is searching for a gear – it will rev up and down until such time as the veh speed increases to about 55-60 mph then it will smooth out. I have the TCI lock up kit in it.
    Any thoughts or ideas?

    Thanks,
    Roger

  17. If the TV cable is not properly adjusted, what could that do to the transmission? I recently did a motor swap on my 91 k15. Well my transmission was working fine when I parked it one night, the next morning it will only go through 1st and 2nd 3rd just revs the motor and obviously it then won’t reach overdrive.

  18. thanks for the info. on the tv cable adjustment. how can I tell what stall speed I have on my converter. I don’t see any info. on it . thnks

  19. Due to a very high demand and high ammount of comments, you have to wait for some time for your car questions to get answered. If you want to get fast answers from a certified master technician you can ask your questions here:
    Ask A Mechanic

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