95 psd e4od 4x4. I got the truck a few months ago and the (old) guy that I got it from said it shifted hard and always has since he replaced the trans in 2001. I did filter and flush and drained the converter. I dont know anything about the trans other than it was replaced and the converter is painted blue (prob rebuild). filter and fluid change helped a little but not much.
When Its cold out side and i let the truck warm up for 5min or so then take off it shifts like a new truck, nice and smooth and shifts when i should. Now if I let it warm up for say 20min or after about 5min of driving it it shifts super hard. It will kinda drag out 1st gear and slam 2nd, then short shift 2nd and hit 3rd and converter locks instantly and lugs the motor. It will be in OD with the conv. locked by the time i hit 40mph. It does this weather im driving easy or stomping on it. Most of the time when its in OD with the conv. locked it wont downshift for hills etc. unless i really get into it.
Like i said when its cold, It shifts PERFECT.
What do you guys think? Oh and no codes or blinking lights or anything. the truck has 240k and no idea how many miles on the trans. No slipping at all.