700r4 Lost 1st Gear Engine Braking
 

Hello
I've lost engine braking in 1st gear only
Trans Go Shift kit 2-3 in Manual configuration installed
Fluid is red
Lucas Additive in the pan
After the shift kit installation I had engine braking in all the gears. After 40 miles 1st gear freewheels

Re: 700r4 Lost 1st Gear Engine Braking
 

Anyone?
I've checked the fluid today and is not cherry red anymore...it's kinda pink but still clear and transparent.
https://cimg5.ibsrv.net/gimg/www.thi...6fc388927.jpeg
Fluid il clear but left some black stuff around the rag

Re: 700r4 Lost 1st Gear Engine Braking
 

Low reverse clutch pack is responsible for engine breaking. Might have an issue there.

Re: 700r4 Lost 1st Gear Engine Braking
 

Low reverse clutch pack is responsible for engine breaking. Might have an issue there. Did you rebuild it yourself?

Re: 700r4 Lost 1st Gear Engine Braking
 

I'm experiecing long delays in reverse gear engaging when cold.
2nd and 3rd gear have engine braking as normal

Re: 700r4 Lost 1st Gear Engine Braking
 

you need to pull out the shift kit and find the problem you created.

Re: 700r4 Lost 1st Gear Engine Braking
 

When my 700 did that, (no engine braking in manual 1st) it was the low/reverse sprag. It's the one way clutch that provides engine braking in manual 1st. Might also explain the reverse issue you're having. They break. Mine failed right after a rebuild and shift kit install. Could have been my driving habits. Could have been poor assembly. After another rebuild, that trans lasted almost forever.

https://cimg6.ibsrv.net/gimg/www.thi...655b5aea1a.jpg
Forward Sprag

EDIT: Didn't see that this thread was from April. Hope the OP has it figured out.

Re: 700r4 Lost 1st Gear Engine Braking
 

If you are having problems now with it. It sounds like you have lost the low reverse clutch pack. When you have it apart, I will give you some help as to how to prevent this from happening again. Was the valve body (since this is a 1987 unit) the first design GM or second design GM valve body?

Re: 700r4 Lost 1st Gear Engine Braking
 

I solved the problem:
Added a bottle of Lucas Trans Slip fix, installed a Corvette Servo and now it shifts perfect with engine braking in all the gears

Re: 700r4 Lost 1st Gear Engine Braking
 

Lucas Trans Slip fix is a very bad idea... :(