i have flogged the shit out of my rear gear set is more what im going on and its fine (runs backwards too)
The rear gear set in 572 was in 571 racing for 3 years, and now has been in 572 since new. its broken 2 stock 14 bolt shafts, and 1 yukon chromo shaft, 3 rear drive shafts, and a transmission. the thing has been zero maintance since new and still looks new lol
I have looked into the Jana70 long ago. dana70 parts are very expensive, custom bearings also. it makes gear changes 5-600$ and spool costs are were crazy when i looked into it.
i plan to do a full 40 spline conversion and 14 bolt center chunk, salvaging my solid knuckles and 3/4 ton brake kit, PSC ram / steering tire rods / Artec arms. The build will require new housing / truss, gear set, 40 spline spool, 40 spline Branik 300M shafts, CTMs, new Solid C's/kingpins, 40 spline hubs, 40 spline spindles and bearings, 40 spline drive flanges, 14bolt inner axle seals, 14bolt 1350 yoke.
its gona hurt but i dont see any other solution to my gear set issues and RCV issues.