trany slipping?

[ytry]

hello guys, I have a little problem I hope could be the tune. I went to the track this weekend and it's 2 hours away from where I live. I have a 1999 pontiac ta with a 4l60e ls1.

On the way to the track I noticed that is going around 80 and give it half throttle it seems like the trany is slipping but then the car catches up and it does fine, I only notice it in 4th gear.

if I step into it it feels great. It's just when I give it a little gas it seems to slip and then catch up.Id there anything I can try to tune this out just to see if it is the trany?

Could this be a TCC problem or could my trany be going out? I have had the PCM tuned by PCMFORLESS and it has been great. It shifts pretty hard from 1-2 but I can tone that down now.

Any info would be great. Thanks:master:

[caver]

Might be the torque converter clutch slipping? I understand it is disabled at full throttle which would explain why it goes fine when you floor it.

[ytry]

Ok can I help it out with the tune or does this mean new parts? :Eyecrazy:
Ok little more info sorry, I have gone from 3.23 gears to 3.73 and have gone in and set my VSS so it will shift right, is there anything i need to change on the TCC? This is what 4th gear looks like.

36.000000 255.996094 40.000000 36.000000
36.000000 255.996094 40.000000 36.000000
36.000000 255.996094 40.000000 36.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
255.000000 255.996094 255.000000 255.000000
255.000000 255.996094 255.000000 255.000000
255.000000 255.996094 255.000000 255.000000
255.000000 255.996094 255.000000 255.000000

[caver]

If that is the problem then it's a mechanical problem.
I dont do many auto boxes, most of the cars I do are manuals so dont take it as gospel.

[ytry]

Ok thanks for the info,,
:D

[joecar]

This is what 4th gear looks like.

36.000000 255.996094 40.000000 36.000000
36.000000 255.996094 40.000000 36.000000
36.000000 255.996094 40.000000 36.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
42.000000 255.996094 40.000000 42.000000
255.000000 255.996094 255.000000 255.000000
255.000000 255.996094 255.000000 255.000000
255.000000 255.996094 255.000000 255.000000
255.000000 255.996094 255.000000 255.000000

Check that the 4th gear TCC Release Speed table is below that.

[ytry]

Here are the 4th gear release speeds....

35.000000 255.996094 38.000000 35.000000
35.000000 255.996094 38.000000 35.000000
35.000000 255.996094 38.000000 35.000000
35.000000 255.996094 38.000000 35.000000
39.000000 255.996094 38.000000 39.000000
41.000000 255.996094 38.000000 41.000000
41.000000 255.996094 38.000000 41.000000
41.000000 255.996094 38.000000 41.000000
41.000000 255.996094 38.000000 41.000000
41.000000 255.996094 38.000000 41.000000
41.000000 255.996094 38.000000 41.000000
41.000000 255.996094 38.000000 41.000000
41.000000 255.996094 38.000000 41.000000
41.000000 255.996094 38.000000 41.000000
255.000000 255.996094 255.000000 255.000000
255.000000 255.996094 255.000000 255.000000
255.000000 255.996094 255.000000 255.000000

does this look right?
:nixweiss:

[joecar]

Looks ok;

can you capture a log and post a pic of it
(include the pids TFMPRS, TCCPWM, TCCMODE, and one of the TSTATE's that contains TCC state).