My1st

I need to either replace or have my transmission rebuilt this winter in my 89.

I’m seeing a lot of low mileage 700r4’s for sale but which ones will work?

Does it have to be out of a corvette or do you just replace the tail piece so you have the mount for the C-Beam?

leesvet

It needs to be out of a Vette or get recon with a Vette kit. The valve body has some control parts that are specified "Corvette Only" that control shifting and how hard/soon shifts are made working with the TCC and TV cable.

Cliff Harris

There are multiple differences between the various years of 700r4s. The main thing to watch for is to get a '88 or later. They made many changes in late '87 to fix problems with earlier years.

The Corvette specific 700r4s have a large "V" molded into the side of the bell housing. The main differences are a special valve body (and corresponding case passages, called "worm tracks") and larger servo.

You can use a non Corvette transmission by swapping the tail shaft housing (you need the C beam mount). The output shaft is shorter on a Corvette, but you can cut off the end to make it compatible. You won't be happy with the result.

Flame Red

Take my advice, have your original rebuilt by someone that has a good reputation and do not replace it. There are many specialized internals in the Vette tranny, and if you get some other GM unit it might end up shifting like a truck. Ask me how I know...

My1st

Thanks, I was thinking the same thing. I’m not sure what’s wrong with mine it shifts just fine through the gears but when I hit passing gear the RPM’s go up but she don’t go. Very bad slip.

cadmaniac

Not to mention the tailshaft housing and overall length is different to the corvette!!

383vett

I've got a passenger car 4l60e with a shift kit. 5/8" off the outputshaft, Corvette tailshaft housing. It works pretty well.

Marv02

My 700R4 out of a Truck it has thicker K case.
The inspection cover is cast aluminum the tail shaft been cut down 3/4 inch for the Vett tail housing shift kit works great for me.

I asked around before I replaced my stock 700r4 mainly it was rebuilt 4 times everytime it came back worse so I said enough is enough it's time for anouther trans.

I went with a performabuilt.
http://www.performabuilt.com/

No core I not pushings Meg HP but so far I glad I purchased this trans I had about 6 months now and 5000 issues free miles on it.

twin540

It can also be you're converter.

pricesgarage

corvette and gmc syclone and typhoon had the best 700 r4 calibrations definally stick with a vette tranny

87 vette 81 big girl

Have your original 1989 C4 trans rebuilt & blueprinted.

Find the best transmission man in your area with experience building 700R4 & 4L60 E transmissions.

Pete K is an excellent veteran auto transmission man here on C4.

I have had 100 % success rebuilding & blueprinting my own 87 vert 700R4 trans.

Either 1 of us can help with C4 auto trans tech.

Pete sold his own transmission rebuild hand picked kits & torque converters in the past.
He may still do so yet today.
have to ask him.

I sourced all my own parts needed piece by piece for my 700R4 trans.

BR