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Welcome!! My in-laws live down the bitteroot and my parents are in Frenchtown so I am in your area from time to time. I also have a rusty beatup old truck (well- the body is anyway, pretty much everything under it has been replaced).
There is a 4x4 club in Missoula that I've been on a few trips with:
http://www.montanabackroads.org/
A lot of Jeeps, but there are a few full size Chevy's also. The group is led by Willy Worthy who used to be an editor for 4 Wheeler magazine. He wrote a book that talks about different roads/trails in Western MT. I've only done the Magruder Corridor Road so far.
http://www.montanabackroads.org/reviews/books/press-release2club-website.pdf
I've tried to turn my truck into a very capable trail and off road rig that isn't too tall. Need for it to still fit in the garage and be able to pull my 5th wheel trailer on occasion.
Keep thinking I'm done working on the truck and can enjoy it but something always comes up. I'm dealing with a mystery coolant loss lately.
Which trails did you do? I wanted to do some of them with the mining history but haven't had a chance yet.