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Help, 4wd inop
We have a 2001 Yukon XL 2500 4x4. I was driving home a month ago in a snow storm when I heard a pop. The truck was in 4wd and I got a bad rattling sound (I couldn't tell from where). I put the truck in 2wd and the sound went away. When I got home I put it back into 4wd and the drivetain would bind so that the truck could not move. Once I'd disengage it would drive fine. What do you all think it might be? Front diff or T-case? It has the auto 4x4 function. Thanks for the help because I'm lost on this one.
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1978 GMC Jimmy, 400, th350, np203 with part time conversion, Fibrecraft popup camper, soon to get a 14 bolt/d44 swap
2001 Yukon XL2500, 6.0, 4L85E, 4x4, family truckster
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