Finally got the ARB locker in the Dana 80, generally no huge hurdles, but there is always something. I took ample measurements of the previous 4.10 gear install, took ample ARB stub/offset measurements, got a good 1st-guess shimstack calculated out, and turns out with the setup bearings the 1st try backlash was 0.0070" with the reused 4.10 ring on the ARB!
I don't have a very big vise at home, and the D80 ring gear bolt torque spec is 175ft-lbs, so I had to whip up a quick fixturing setup to stop the carrier from rotating as I torqued it up.
With the backlash set up and no other real checks to do, it was time to final-install the carrier. But turns out ARB sent 2X Dana 70 seal housing retainer brackets, which weren't close to fitting a D80 carrier bearing cap. So I had to get modding.. naturally..
Threw in two 1/4"-longer bearing cap bolts to account for the added thickness of the bracket, and double checked that the tab on the bracket would still engage the notch in the seal housing (it was fine, engaging ~0.230" deep)
Lastly, was drilling+tapping the port hole in the housing. ARB instructed to put the bulkhead fitting on the driver side, on the outboard side of the ring gear. I spent a good 45min measuring, angling, hypothesizing, and trying to imagine it in my head.. but there was no angle that I liked for entrance/exit with the cast iron housing being probably 1.0-1.5" thick at this spot, and not pointing the copper line directly at the tone ring and/or the ring gear bolts.
So I decided to route the line over the ring and have the bulkhead fitting on the passenger side of the carrier. Once installed, the copper line seemed rigid enough, and there was a solid fat-thumb-gap between the line and the ring gear, while having a 1/4" gap all round it to the cast iron to hopefully avoid rubbing/abrasion.. so we'll just see.