Bullit95T/A

I got a 1995 4L60E with the pwm pump.I was wondering how can I disable the lock-up feature in the trans? for testing and maybe even permanently, And if your wandering why, I'm having a problem with it stalling when I shift into reverse and drive I can get it to move down the road and it shift very hard & well into all gears but when I come to a stop and hold the brakes at the stops it wants to die also king of chuggs& tuggs a little at low speeds.This leads me to believe there is something wrong with the TCC feature aka-lock-up.This is a fresh rebuild with a new TCI lock-up converter and a PCMforless tune.

Lee12609

iTrader: (3)

you can do it in the tune or by snipping the wire going to the lockup circuit, but i would get a good scanner on it and see if its the TCC or not first. sounds more like an idle issue to me, maybe a slow IAC motor.

Bullit95T/A

I replaced the IAC no cure to the problem I'm going to check foe a wiring issue today.

mrvedit

I had this EXACT same problem and the problem turned out to be a burnt Torque Converter lockup clutch that was no longer fully disengaging.

Bullit95T/A

Ya I'm starting to think my converter is the problem.

fat60

The tcc valve in the pump may be stiking causing convertor to stay locked at all times, makes shifts very hard & feels like you forgot to put the clutch in if it was a manual trans when slowing down.
You said it was a fresh build so check this valve first, could have been misassembled or may have debris left from before build

Bullit95T/A

I'll take a good look at the pump as soon as I get my new stall converter in.
I'll remove the pump and check the valve.

mrvedit

You don't need to remove the pump to check the TCC valve in it. Just need to drop the pan and using snap-ring pliers remove the plate that holds everything in.
The smaller hole is the TCC valve; the larger hole is the Boost valve.

Bullit95T/A

OH! I got you, I remember seeing that, but the trans is coming out any how.
I thought it was the longer converter clutch valve not the pressure regulator valve that's with boost valve.

Bullit95T/A

I installed this kit and suspect it's cause of my problems it's the first time I ever used this kit.here the link....http://www.ebay.com/itm/GM-Chevy-4L6...2259ae&vxp=mtr Has anybody ever used this before?

mrvedit

The parts in there look like a very basic shift kit. I don't think it is the cause of your problem.
I confirmed I had a converter problem by ensuring there was no TCC apply fluid by doing two things:
1. Removed the TCC apply valve on the pump and removed its o-ring.
2. Reinstalled the TCC apply valve with 1/8" spacers to make sure it was
no sealing in any way. (I would have removed it completely were it not wired to the harness.)

Bullit95T/A

I give this a try before i pull the trans out this weekend

mrvedit

Its a long shot, but sure beats pulling the trans.

Bullit95T/A

Ya, I tried it and it didn't work so I'm going to install a REVMAX stage 3-3600 nitrous stall converter and see if this clears up my problem if not it's has to be something bleeding across in the hydraulics.I just don't get it! It shifts real good and hard but the dam thing still stalls out when shifted into gear from park or neutral.

mrvedit

Sorry that didn't work, but it was a long shot. That test pretty much ensures that hydraulic pressure is not getting to the lockup clutch, for any reason (hydraulic or electrical).
With that test made, I am very confident that replacing the converter will solve your problem.