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I don't know a whole lot about the jeep stuff so I'm sure there will be a learning curve...
I got your ahead of the curve right here!! 8|
D30... treads in my territory. I have proved that if you polish a turd long enough it will at least get you through the con.

Running the 36's on the D30 is real hard on it. Stick with 33's for now. Does the front end have the vacuum junk? If so then it is a quick fix that gives you another knob to pull inside the cab.
These guys have been making these for quite some time and have to say... cost more then I expected. The system can be had at
THIS site for a bit cheaper then from the manufacture. I don't have one a vac system in my axle...92. That axle is between the years of 84-91, if indeed out of an XJ.
OR
If you get yourself a whole passenger side shaft then just bolt a cover over the whole in the axle tube and you have eliminated the vacuum junk. I think I have one laying around??? not sure :-
Bearings. With 33's you shouldn't be to bad if the axle is set properly. They are a unit bearing hub that will take a big beating on 31's but starts to stress after 33's. The axle shafts are what most people worry about with the D30. The shafts the selfs are small and the u-joint.. forget it. Costly route is what I did to feel better about the axle shafts... I replaced them with Cromo's. Cheaper then that would be to just beef up with stocker shafts. Most D30's came with a Spicer 260x -1.06"wide cap. The other option is a 297x - 1.187" Cap. Sure you have to find the shafts in a junk yard but that should be from 95 and up... think :>
As for the drag link... just last week I took 2 0f them to the dump. Thing is they pit the ball joint at the knuckle on the drag link itself. Ball joint goes and the drag link is done. At
Quadratec there is 2 part numbers. 56118.11 is 84-90 at $40. this is the one I think you need. The other # is 56118.12 for $65. this one is for years 91-01.
I would shoot in the dark and think you have 3.55 gears.
Anyhoo enough for now about that.
I can already see a exo on that truck!! :rules:
Useless text that your reading for at least the first time.