You could do a search for leaks in this forum, but I don't recall a bolt leak (or near a bolt leak) on the transfer case. There have been case porosity issues with a few early Allison transmissions that resulted in leaks at a couple of bolts (behind the torque converter).

If this is out of warranty, I'd eliminate a possible case defect as a cause as a first step (i.e. crack etc.). If that's not the problem, I'd pull the offending bolts, then seal them using a bolt thread sealant (it's like Teflon pipe dope), and/or possibly install a copper washer (GM pn-10139097) under the bolt head.

The copper washer trick is how GM solved some of the early (pre 11/03 build dates) Allison bolt leaks.

Jim

PS. You are correct about the diesel supplement mentioning Auto Trac fluid for the transfer case..... My 2001 diesel supplement mentions the 6.5L diesel as well... Seems a few bugs found their way into the various books and manuals. I use Dextron in my truck's transfer cases. [img]smile.gif[/img]