Weird Trans Issue

[strongt]

My 2001 4.0 has been having shifting issues now that the temps in my area have been above 100 degrees. What's been going on is when its cold or the temps are below 100 outside it shifts just fine. Above 100 degrees, it's fine if started cold and will shift fine on the road till I shut it off. If I restart the car in a few minutes it'll shift very hard into gear. If I disconnect the battery, then start it. She will shift fine after the computer resets.
Sometimes I can just turn the car off, then back on and it will start shifts fine again.

Trans has had the filters & fluid changed, but no change in it's hard shifting above 100 degrees outside. The funny thing is it'll only happen if I just shut the car off like to fuel up and start it up and put it into R or D?

Any idea's guys ?

Also no codes stored.

[phewop118]

Check connectors for fretting on the contacts. It's a long shot but very possible. Anything from transmission connectors to MAF sensor and throttle position sensor connectors. Clean them all with electronic contact cleaner.