TCC locks and unlocks with a kick

[jpratt]

I have a Century built trans and a Precision 5 disc lock up convert. Using Type F trans fluid.

When driving normal the trans shifts firm, maybe a little too firm. Around 45 MPH under light throttle the TCC lock and snaps your neck neck back. Then if I lift the throttle a little it unlocks and almost makes you lunge forward. Then it seems a few seconds later to lock back up again. This only happens under light throttle and around 45 MPH. Well most speed limits around town here are 40 - 50 so I seem to be at 45 a lot. It is better if I drive in D instead of overdrive. Under heavy throttle the shifts are crisp, firm and sometimes will break the tires loose. No complaints under heavy throttle.
I am thinking about switch fluid to something a little easier or maybe installing a switch. 1. prevent the TCC from locking up under computer control. 2. allowing computer control. 3. manual lockup for racing.
I was told type F fluid gives better harder shift, does it also affect TCC lock up?

 

[TurboDave]

It is normal for the TCC to unlock when lifting off the throttle (very low tps). Then relock when moving into the throttle. The type of fluid wont affect TCC lockup, but it sounds like you're experiencing normal operation for a multi disc vigilante. Yes they lock and unlock firmly. The best bet would be to get your chip modified to set cruise lock closer to 55. Or better yet, get a chip that has adjustable TCC parameters that allow different cruise lock settings, and also allows computer control of WOT lockup. (Extender/Commander).

 

[turbojimmy]

It is normal for the TCC to unlock when lifting off the throttle (very low tps). Then relock when moving into the throttle. The type of fluid wont affect TCC lockup, but it sounds like you're experiencing normal operation for a multi disc vigilante. Yes they lock and unlock firmly. The best bet would be to get your chip modified to set cruise lock closer to 55. Or better yet, get a chip that has adjustable TCC parameters that allow different cruise lock settings, and also allows computer control of WOT lockup. (Extender/Commander).

^ What he said. I have a 5-disk Vigilante and it locks and unlocks hard (that's a good thing). I usually program my Extender to lock around 55-60 MPH.

Jim

 

[jpratt]

Thanks guys.