What was your "HD"?

Yes it seems that the guy you got the Jeep from did all the leg work for fixing the big things. I would do the Ebay thing and find a factory replacement CD/tape raido. Like a add to this Fourm about the Ohms form the factory system. Did they put a aftermarket radio in the Jeep?

The factory has an Amp in most limited or V8 jeeps, and ...well i'm not going to write forever here, it's just not a good idea useing aftermarket, I don't know if you have the steering wheel radio controls, but if you do it takes Mr. Spock to wire them up to work with an aftermarket system.

I have to tell you I LOVE those controls, I can even go into my factory 10 changed in the back without even looking at the head unit in the dash.

I'm looking into getting a Dodge 3500 98 1/2 24V up and I do hope that I can get it with the controls on the wheel.

You have a 249 T case most likely so it may be a good idea to put a little money aside to when t DOES go bad, what you may want to do is switch to a Slect-a-track, it's not as strong, but not that weak it's going to have problems. With it you can have 2wd, or 4x4 full (just like yours) 4x4 part, and 4x4 low part, I drove a loner 02 with that T case, man what a fun time I had with it, and I may have beat on the jeep a little but it can take it...lol, man that I6 gets better gas miles, crap LOL.