Mr.890,
I belong to ALLDATA and I looked up our problems and may have found some help. It seems GMC had a recall on both our problems. I am including 2 Winzip files for you to look at. I hope they help. If they don't I would suggest going to GMC service because there is alot of recalls or TSB on our transmission.
I assumed you a 4L60-E transmission but you might have the 4L8060-E but there are similar recalls and TSB's for both and we should have received a notice from GMC but I never did, I don't know about you though.
Best Regards,
Ernie22
[email protected]
Nick,
I just found out I cannot email you the attachments. Please send me your regular email address and I will send them to you.
You can always email me at ernie22.comcast if this does not help.