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Update: The cooling loop in the transfer case was not damaged - since being serviced, there has been no ATF in the hubs or air filter. There was still an ATF leak, which we tracked down to a loose vent at the top inside of the transfer case. So far, so good... PBR

RTFM... got it. :-) My truck is an Ex-Marine vehicle, and it's set up with a fording kit. The switch 's in the vent position. I'll check that system. Thank you for all of the responses. :-) PBR

Just got off the phone with the dealer. He says they tested the intercooler and put 60psi air pressure through it - it tested fine and wasn't damaged. What's the chance they're wrong? If I have the vampire and the crack is small, could it hold pressure for a few minutes and not leak...

Crap, crap, crap. Thanks Haasino. I was searching the Hummer Knowledge Base about 4L80 trannys and saw that link - just didnt get to there yet. If it floats, flies, has wheels, or tits... :-) jas

I bought an '86 M998 about a month ago. Being new to MVs, I took it to the former Hummer dealer to look it over. Maybe a mistake, maybe not... I figured they would know best what it needed, and given that I don't have a lift, I wasn't sure that I could lure an E5 from Fort Lewis to come check...