thefightback

Hi all. I recently purchased an 86 Z28 here in Perth, Australia and am having problems with the trans. It feels like the torque converter is locking in when i hit low throttle in 2nd gear. Has anyone else had this problem and if so what needs to be done? Thanks

thefightback

so should i assume no-one else has had this problem?

dimented24x7

iTrader: (2)

Might just be the way the computer is set up. Its set up to lock early and if you have 2.73s, itll easily lock up in second gear. As long as it unlocks during 4->3 shifts and when you punch it the TCC function is probably ok.

Abubaca

iTrader: (3)

I had a similar problem. I'll spare you the how and why, and jump right to my solution.

I wired a manual switch up to the brake switch. That fools the computer into thinking the brakes are on and it won't lock the converter. With the flip of a switch I can go back to "normal" mode for highway driving, but around town I leave it off.

I had 2.77 gears and a 2200 stall converter. When I swapped in a 3.27 rear axle it was no longer a problem.

thefightback

thanks for the info guys. the TC unlocks when you do put your foot down but when it locks up so early (like in 2nd) it causes the car to shudder a bit. also, because its locking up so early, it is constantly unlocking again when driving in the city (like when you slow down to take a corner) and ive heard this can damage the trans. there isnt any way to adjust the computer is there??

3.8TransAM

Hit the DIY-PROM board(my sig). Lots of info on tuning and reowrking the annoying factory TCC setup :-)

later
Jeremy

thefightback

i have decided to go with Abubaca's idea of a manual switch. anyone know where i can get a wiring diagram and how do i make it so the brake lights wont come on when the switch is on?

Abubaca

iTrader: (3)

OK, don't quote me on this, but I "think" it was a pink wire. I'll have to go out and stick my head under the dash tomorrow. Anyhow, I just bought a switch from autozone and wired it inline with the appropriate wire.

Maybe it was purple?


....lemme see if I can't do a search and find out.

Abubaca

iTrader: (3)

Hah! It was both pink (power to switch) AND purple (switch to tranny).

Here's the thread. About halfway down, IrocZZ3 suggests the method that I used.

https://www.thirdgen.org/techbb2/sho...hreadid=265783

thefightback

excellent! even easier than i thought. thanks for all the help!!!

thefightback

had a mate install the switch today.... took about 10 minutes and car runs smooth like it should now. thanks for all the help guys!

88Camaro350

Hey, Abubaca. How did it run with the stall and 2.77's?

I haeve 2.73s now. I plan on upgrading gears later but my front seal is leaking so I need to change that now. No better time to throw a stall in it either.

I want a 2400. But I'm afraid the trans will get to hot. Think it would be ok with my cooler and if I put a lockup switch on it.