stall converter slips when cruising

**heath26** · 02-14-2012, 02:32 PM

its like the locking disc in the converter is junk it will slip when its locked but stomp it and no slip just unlocks and lays you back. i have a aftermarket trans and a 3400 fuddle. dont know if its in the trans or the converter put them in at the same time at first it wasnt bad but has gotten worse over time

**pajeff02** · 02-14-2012, 02:42 PM

Have the transmission settings been modified in your tune?

**0rion** · 02-14-2012, 03:42 PM

can you describe what's going on a little better. To me it sounds like it's unlocking on it's own? Couple things will cause that....misfires and misfire counts in the pcm are a couple of the more common reasons.

**heath26** · 02-14-2012, 05:38 PM

Originally Posted by pajeff02

Have the transmission settings been modified in your tune?

no the settings are the same as they were when i had the origanal trans with 3400 stall

**pajeff02** · 02-14-2012, 05:45 PM

I asked as I had issues when I upgraded my transmission -- the combo of the performance valve body and existing tune caused erratic lock up. Once the transmission settings in the tune were adjusted the problem went away.

**heath26** · 02-14-2012, 05:45 PM

Originally Posted by 0rion

can you describe what's going on a little better. To me it sounds like it's unlocking on it's own? Couple things will cause that....misfires and misfire counts in the pcm are a couple of the more common reasons.

sometimes it does unlock and i can tell when it does but usually if you just want to speed up just like 1 to 2 mph it revs about 200 to 400 rpm to much. it had a code on it last time i checked it was something like excessive rpm range i cant remember the number i'll have to pull it