@cruiserinsanity and I did a rear axle swap on the '85 today. The diff currently under it has slop in the pinion bearing and the parking brake is frozen. The extra rear axle is one that I had been running under my '86 FJ60 until I did the 80 series FF axle. The diff is good, and 4.11 like the '85 has but the brakes will need to be rebuilt. One drum was full of rust and put up a good fight before coming. Rear bearings and axle seals had been replaced in the year prior to the axle being pulled from the '86 so those are good. It was a full day swapping over the axles.
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Next up will be pulling the 3FE for a refreshed head, fix the oil leaks, add in a H55F and rebuilt t-case.