Transmission? Gears?
These were RENIX rigs, but I've driven with 30's and 31's - and much of my driving was on-road, with plenty of freeway and mountain time.
With the AW4 and stock 3.55 gearing, throw on 30's or 31's and forget about it - I honestly think that either of those larger sizes actually work out /better/ than the OEM tyre size (of about 28", as I recall.)
If you have a manual (BA-10 or AX-15) and still have the stock 3.07 gearing - which, y'ask me, was a mismatch and mistake! - then the fix until you regear is simple. Stop using fifth gear. Trust me on this one - my 88 perked up considerably and mileage improved noticeably when I stopped using fifth gear (both with the OEM BA-10/5 and replacement AX-15.) The improvement was noticeable on the OEM tyre size, 30" tyres, and 31" tyres.
If you go larger than 31" with any setup, start thinking about regearing. Throw axles from a 6-242 auto under, and you go from 3.07 (a horrible idea) to 3.55 (which will complement 32" or 33" tyres, unless you get silly.) 4.10 gearing can be found under some four-cylinder rigs, and you can also turn up 3.73 under some 6-242 (AW4 with tow package, I think,) and there /may/ have been some 4.55 out there (four-cylinder with tow package, I think. Early years only. Don't hold me to it.)
Swapping an axle in good condition outright is easier than regearing, just inspect it will and install new seals and wheel bearings out of hand.
If you change rear axle models (the D35 and ChryCo 8.25 were common, the D44 was available in 6-242/AW4/tow package as an uncommon option through about 1988/1989,) then make sure to grab the rear driveshaft as well - the pinions are different lengths. Therefore, the driveshaft length changed (the D35 has the shortest pinon length from the tube centreline, the D44 has the longest, as I recall.) The splined output shaft should be the same in all cases. You /may/ need to adapt the handbrake cable as well - I think it's the same until it splits to the wheels, and grabbing the cable assembly (or ordering it new) shouldn't go amiss.
Good luck!