UpDate: More FUN!!! Re P1811 Max Adapt long shift on 4T65E trans.
Yesterday I put the whole 16 oz can of SeaFoam Trans Tune in Fluid.
Link Trans Tune: http://www.seafoamsales.com/trans-tune.html
and drove mixed highway & city without any harsh up shifts occurring in a long time.
Sounds like a flush of varnish will be good, but am not going to leave it in for more than a week or so before......
It gets to a trans shop, I have no interest in doing this, no time & no lift, get a shift kit with new springs/spacers installed.
Recommendations on shift kit? Thrasher,TransGo etc etc...???
Then going to use Dexron VI (6) , LubeGArd Red and.....
Get a GVW 22,000 lb + cooler installed.
Hopefully that brings the 4T65E up to speed and ends the harsh BS upshifts.
& Dan wish you were here, we would get on this... (beers & steaks supplied)
Please leave your sledge at home though! ha ha...