Well i recently have been having problems with my 4l60e. I know im not a tranny expert but maybe someone with a little more knowledge than me can help.
Heres the deal...Tranny revs really high before shifting out of first gear...shift takes like 5 seconds when the tranny is at operating temp...but shifts are somewhat normal when it is cold but it still revs high. This only happens during the 1-2 shift and not any others. I have my tune back to stock for now so its nothing in my tuning...I installed the shift kit, servos, and stall myself but it has been like over a month since I did that stuff. If anyone has any ideas please help me out!!!

THANX,

JESSE

 

That sounds like the 1-2 band is A) shot or B) not getting enough line pressure to hold. Either way, you need to get it taken care of before more damage occurs.