My diffs (Losi) go for months without need for rebuilds, never slip, and stay smooth. This applies to electrics and the NT. For losi offroad diffs, the most important thing is to carefully follow the assembly manual in all areas with one exception which I'll explain in a bit. After trying lots of different greases, the best is still the Losi diff lube on the diff balls - enough so they are constantly bathed in a thin film (the AE diff lube should be just as good here). Second use a good grease like a white #2 EP on the thrust assembly and lots of it. Lube on the TB is critical. Ronnie grease also works here but I now use white EP. I don't use the white assembly grease supplied by Losi for the thrust bearing. In my opinion it's too thin and tends to migrate out of the thrust bearing, leaving it vulnerable to wear from inadequate lubrication. That is why your TB wears prematurely and perhaps it may be a factor in reputed Losi diff problems - who knows? Lube failure in the TB gives that gritty feeling. Very important, the thrust bearing grease needs to form a dirt proof seal with the blue foam seal and it needs to stay put so a #2 grease is about right. After disassembly, my TB is shiny clean - no dirt, if it's not, that's the problem. 3) The diff must not be allowed to slip. If you hear it barking, that's the sound of your diff ring shedding metal from the groove the diff balls are gouging ever deeper. 4) There is no need for gear lube in the tranny case and you never want any oil from the tranny bearings to contaminate the diff grease. A free running quiet tranny is important but I'm careful not to overlube these days and compromise the diff. If you strip the diff nut, it's way too tight - something major is wrong. If by mistake you swap the small bearings in the diff with one of similar size in the tranny case, the diff will not tighten and the diff nut will strip.
Last edited by PeterAiea; 02-28-2003 at 02:27 AM.