Replacement Auto Transmission?
#1
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Location: Maple Grove Minnesota
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Replacement Auto Transmission?
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?
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?
#2
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.
#3
Race Director
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.
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.
#4
Le Mans Master
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...
#5
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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.
#7
Race Director
I've got a passenger car 4l60e with a shift kit. 5/8" off the outputshaft, Corvette tailshaft housing. It works pretty well.
#8
Burning Brakes
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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.
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.
Last edited by Marv02; 12-07-2011 at 11:04 PM.
#9
#11
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
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