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Checking my old notes, the only Savage diff setup that ever held up for me was the machined bulletproof ring/pinion gears on HB D8T cases with D8T hardened steel sun/planetary gears. Prior to that it would eat diffs of all flavours. Stripped ring and pinion gears, shattered internal gears, and my favourite: blown undersized 10x16mm bearing on the case side that was effectively the only option for a long time because neither HPI nor aftermarket vendors could figure out how to integrate a steel bearing holder that would allow for the use of a proper 8x16mm bearing on both sides.
The best Savage diffs ever circa 2012, parts to build them probably haven't been available for close to a decade at this point unfortunately. Looking at these pictures again made me remember how annoying they were to build because the outside diameter of the outdrive cups was larger than the inside diameter of diff shims, meaning one had to take the whole thing apart to add or remove a shim and then put them back together to test the fit. I wonder if this is still the case on the new trucks.
The best Savage diffs ever circa 2012, parts to build them probably haven't been available for close to a decade at this point unfortunately. Looking at these pictures again made me remember how annoying they were to build because the outside diameter of the outdrive cups was larger than the inside diameter of diff shims, meaning one had to take the whole thing apart to add or remove a shim and then put them back together to test the fit. I wonder if this is still the case on the new trucks.