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Replace RC10 stock bulkhead with this NIX63231 bulkhead and you'll be able to mount RC10B4.1
(ASC9826) or RC10B4 (ASC9574) transmission to your RC10 tub or carbon chassis. You don't even need RC10 Stealth transmission holes in chassis as this bulkhead mounts to stock bulkhead holes and rear holes of classic 6-gear transmission. There's no need to modify your chassis at all. What you'll need to do is to cut away lower section of B4 transmission case just under the diff gear. It's easy when using NIX63231 bulkhead as a guide (take diff out while doing it). If diff gear ends up beeing too close to chassis, make a spacer between bulkhead and chassis from lexan .