Actually TJDave, the best swap outside of a TJ D44 would definitely be a Ford 8.8 rear axle out of a Explorer/Moutaineer. Ford's made tons of these in the 90's and you can find ratios of 3.73 and 4.10 in them, disc brakes, and sometimes limited slips in them. Should be easy to find. It's just slightly narrower than TJ axle width but with offset wheels you should be fine and you can use your present wheels as it has the same 5x4.5 bolt pattern. I think there's a type of "bastard" U-joint to go between your present rear driveshaft and the pinion yoke on the 8.8. If not I know there's a adapter that changes the flange style pinion yoke of the 8.8 to match the yoke on your TJ's driveshaft.
The benefits over a TJ D44 include a stronger ring gear (8.8" vs 8.5") and I think bigger splined axle shafts. It does have a C-clip like your D35 but if you're breaking that C-clip you got some bigger problems. People have run up to 37's and lockers on these with no issues.
There's a super 8.8 kit as well that eliminates the C clip and makes the width of the 8.8 the exact same as the wrangler.
Also be careful of getting an 8.8 out of a Mustang or Ford Ranger as I think the spline count is smaller, except for the FX4 series Ranger which has the same type mentioned above.
Actually you may want to talk to Lurch on this too, he'd know more than I would about the Ford stuff.
Here's the best link I have for this swap. Has all the measurements for the axle brackets and parts you'll need and where to get them.
http://www.stu-offroad.com/axle/8.8axle/8.8axle-1.htm