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Just checking to see if you had any luck with your sons truck, I posted what I discovered below but it looks like I need a rebuild, Thanks , Just curious what you found out.

follow up Hooked up a scanner and discovered that the ecm is shifting correctly into all geras however it still slips in reverse and 3rd. The odd thing is that the longer I drive the truck the less it slips in reverse. Upon first start it slips alot but after about 15 minutes of driving it...

Follow up Im leaning towards, worn clutches. If the pump was weak wouldnt it slip initially but as rpms increase the pressure should rise. On a flat service it will roll backwards in 2wd or 4wd high but it slips as soon as I hit incline. Does make sense now that I think about it working in 4wd...

Changed the filter yesterday to see if any help and there was no difference. My question would be should I pull the transfer case or go ahead and pull the whole thing. If reverse works fine in 4wd low wouldnt that indicate thet the tranmission is functioning. Since the issue occurs in 2wd or 4wd...

Have a strange problem that I wanted to see if anyone had a suggestion before I pull the trans and transfer case. Recently purchased a 94 GMCc2500 4wd with the 6.5 diesel engine. The problem occurs when I put it in reverse it moves but is slipping. If I shift to 4 wheel low it works fine. It...