TB22

iTrader: (2)

I just recently rebuilt my 4l60e, and after reinstallation the car now "bucks" when the converter locks and I let off of the throttle. Ive done much research and have removed and dissasembled the transmission three times now and cant seem to find anything wrong.
HERE ARE THE PARTS I'VE USED.

KOLENE STEELS
RED FRICTIONS
CARBON FIBER 2/4 BAND
NEW TCC SOLENOID
TRANS GO SEPERATOR PLATE
SUPIERIOR SHIFT KIT

performabuilt

iTrader: (25)

I would first verify that the converter is being commanded to unlock

TB22

iTrader: (2)

When i apply the brakes it does unlock, and stops "bucking". I forgot to add that above 65 mph it seems to smooth out.

TB22

iTrader: (2)

Duh, now i understand what you're saying, when the throttle is closed it shouldnt be in lockup?

Badazz 97 TA

iTrader: (18)

do you have a bigger cam or anything like that?

TB22

iTrader: (2)

yes ms4, prc stg 2.5s but didnt have this issue before the rebuild

performabuilt

iTrader: (25)

Well since when you hit the brake it stops that means the lockup function is working properly. I would say you need to look at data and see whats happeing there.

TB22

iTrader: (2)

I think your on to somthing, because now that i think of it it did not unlock when i was off the throttle and correct me if im wrong but i think that the tcc/pwm solenoid is controlled by throttle postion.

Badazz 97 TA

iTrader: (18)

Maybe the LS1 PCM and trans's are differnet, but my car doesnt unlock when i take my foot off the gas. It will unlock once i press the brake or obviously go below the lock up point. Other then that it stays locked. i was thinking maybe its just some cam surge but i guess not.

TB22

iTrader: (2)

I've been told that by several people but, it was perfect before the rebuild, i'm definetly missing something.

big wally 55

The brake pedal kills the voltage supply on most tcc setups .The pcm supplies the ground and closed throttle should command unlock . You need to scan it if possible to find out what's being comanded .
I have also seen a shorted wire on the ground side of the solenoid circuit cause the symptoms that you have !!

FLT

iTrader: (1)

Tuning would be my first guess. However on this rebuilt you posted that you installed a superior kit. If I remember correctly the late model kit comes with a converter clutch valve for the pump. Does it also come with a spring to pin the regulated apply valve and the isolator valve in the valve body? To be honest it has been over 5 years since I have installed one of these kits. It seems to me if memory serves me correctly we had issues if both were installed at another shop I worked in. You might want to try to remove one or the other and return back to the factory set up to see if it helps any. I believe the pump mod was the one we skipped in this kit. Good luck. Vince

SSIRBY

iTrader: (44)

just wondering, when ya wanna get on it and it doesnt kick down, does that mean the converter is still locked up or what? sometimes it would let me, sometimes, it wouldnt.