If you see Eddies video of him running 40’s on a 35 spline 44, he grenaded his ring and pinion, not his shafts which is most likely what will happen even with a light foot under the right conditions...
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Another thing is he was running 5.38s if I remember right, I’m currently on 4.88s and would probably only jump up to 5.13 if I felt like it absolutely needed it. I hated my 4.88s on 37s. It felt way over geared and I was cruising above 3k on the highway. The 4.88s seem perfect with the 38s right now so I couldn’t imagine bumping above 5.13 for 40s.
If I do end up breaking a r&p, I have a brand new one on the shelf with master kit from when I bought the pro rock so itl be a lesson learned. The general consensus here is to stay away from the sf 60 though. Might just leave it alone until it gives me an issue and go from there.
To be clear, it was a 5.38 ring & pinion, 35 spline ARB locker, in an oem non-rubicon rear D44 housing, pushing HEAVY 40/15.50R20 toyos on 20" spiderlocks.... basically the heaviest tire possible. the shafts were fine, but the ring gear was stripped because the pinion was so small it only engaged a few teeth at a time.
My revolution rear 32 spline shafts have been fine with 37s on slabs and 1.5" spacers. I wont lie and say I dont worry about them when the trail gets tough, but so far they have survived some spinning on the rocks just fine (good bumps).
I think a 35 spine conversion in the rear 44 will be the better bet over a SF60 for you (and the majority of people). the ONLY thing the SF60 will gain you is ring and pinion strength... but you want to run the 4.88 gearset anyway, which is plenty strong in the D44 :twocents: save 60s for full float hubs IMO