allright allright I know its all been said before so installed the sonnax tv plunger and sleeve kit 77966-94mk. supposed to eliminate the 4-3 downshift at wide open throttle. problem is it still down shifts. any thoughts on this? could the tv cable still be adjusted wrong?

 

I can't speak for the Sonnax but some of the a/m valves still allow the downshift.
Try: https://www.thirdgen.org/forums/tran...wot-3-4-a.html

 

yeah ive seen the modification was hoping to avoid it. the new sleeve was supposed to cure it.

 

From their website:

http://www.sonnax.com/parts/2513-thr...nger-valve-kit

"Prevents forced 4-3 kickdown below three-quarter throttle"

The B-Body fix kit (discontinued) or the stock sleeve modified is the way to go.

RBob.

 

With the modified sleeve, I could do a 4-3 shift at anything below 85 mph. Once you get past that, it would stay in O/D. So yes, you can still make a 4-3 shift when you're on the highway and want to pass somebody.

 

Yes, that is correct. Depending on the rear end gear ratio, will mostly determine when the 4-3 downshift goes away. 80 - 85 mph seems to be the numbers I have seen when it stops downshifting using the modified TV plunger sleeve.

 

that's good to know. wonder how it would be with 4.11 vs your 3.27 gears. and is it going to try and make a wot 3/4 upshift above 80-85?

 

With the lower the gears 3.73's, 4.11's, 4.56's the lower the speed to get 3-4 WOT shifts and eliminate 4-3 downshifts when blocking the 4-3 passages in the TV plunger sleeve or the aftermarket sleeve.