Hey there can someone help me by telling me what T-Case I have in my LMM???? Is it the auto-trac?

no duramax trucks use the autotrak

Thanks just got my front line built. Guess the dumb guy put the wrong cv in.

What part are you talking about, when I lifted my truck I think the replacement front drive shaft said auto track on the box, could be wrong but thats what I remember

Well i had the splined part that goes into the t case removed and a new cv added which gave me the extended length and cv. I remember the guy looking under and saying autotrac and he had the part in stock. I gave him my drive shaft and picked it up a few hours later. now the drive shaft wont even go back in its like its the wrong size.