Re: CJ7 Quadratrac
If it has a shifter on the floorboard then it has low range. $3500 sounds high, unless it is in great shape. To give you some comparison, I paid $900 for my 76 CJ-7. It came with a 304, TH400 trans, Q-trac without a low range, AMC 20 rear with 2 piece axles (one was blown), Dana 30 front, drums all around, PS, PB, rear shackle mounts that rotted away, etc.
I spent $300 on Superior Axle & Gear 1 piece axles, $100 for a low range unit from someone on this board, rebuilt the rear of the frame, bought 33" Goodyear MT's for $300, replaced brake lines, brakes, all filters, new gas tank, fuel lines, fabricated a new rear bumper, welded the rear diff and more. All together I spent an additional $1000 to get it trail worthy. $600 of that was axles and tires though. The only thing left is to replace the tub or rebuild my body mounts.
The AMC 20 is known for weak two-piece axles and axle tubes, but there are ways around that by buying 1-piece axles and welding the tubes. The ring gear and pinion are huge and bigger than a Dana 44's. A lot of guys don't like the Q-trac, but if you take care of it, it can hold up. I would rather have a gear driven case, but the Q-trac is what I've got and CJ Dave has some great mods that make it better. Will is another Q-trac guru.
The Q-trac has a vacuum switch in the glovebox that switches between normal and emergency mode. In normal, the tcase allows the front and rear outputs to differentiate much like the an open rear end. Emergency mechanically locks the front and rear together for more traction. The trans is bulletproof and usually found in full-size 3/4 or 1 ton GM trucks.
I haven't done it yet, but you can convert the front drums to discs by using some chevy parts, or swapping out the knuckles outward with a disc brake Dana 30.
If you can get a picture, post it, a lot of guys can help you out.
1976 CJ-7, 304, TH400, Q-Trac, 4:10's, 33x12.5 Goodyear MT's, blah, blah , blah...
"Heavy guns - Reach out and touch someone"