Issues only when hot

[TheFirebirdGuy]

i've got two issues (possibly related) with the 4L60 in my '97.

1) lockup is inconsistent when hot. This only occurs after driving 1hr or more at a time, i drive 40 minutes one way a day and no issues. The TCC won't lock up like usual. Sometimes i can play with the throttle (let almost all the way off and ease back on) and get it to lock back up and sometimes i can't. After i park and let it sit, next time i turn it on everything is normal.

2) also occurs after driving on the highway for long periods. Only occurs if the lockup issue is also happening. The 1-2 shift is HARD, all others are normal.

Any advice would be greatly appreciated.

 

[TheFirebirdGuy]

The starter also cranks over really really slow when it's hot, not sure if that's related. It'll start but it takes it a minute to get spinning fast enough to turn over. It'll do this even if it'S not having the other two issues

 

[DieselDetroit]

Had an issue. It was because my 97 was misfiring. The pcm didn't allow lockup. For me it was an EGR so I unplugged it, no misses, had lockup

It may not be tranny related is what I'm saying. Do you have any active or stored codes? My truck was misfiring for a year but the cel only blinked twice to let me know.