Kyosho UM611 Diff Case Packing Set (2)

Kyosho UM611 is a genuine pair of differential case packing gaskets for the sealed gear diffs on Kyosho's 1/10 off-road vehicles. This thin gasket sits between the two halves of the diff case and does one critical job: keeping the silicone diff fluid sealed inside. Every time you split the case to change fluid or inspect the gears, the packing takes a set, and reusing a compressed gasket is the most common cause of a leaky diff. A leaking diff loses fluid, changes action mid-run, and makes your setup inconsistent.

These are direct factory replacements for the gasket supplied in the Ultima gear diff, fitting the Ultima SC, SC6, RT6, DB, RB6, and RB6.6, plus the Lazer ZX6.6 diffs built on the same case. The package includes two gaskets, so one pack covers two diff services. Smart practice is to drop a fresh packing in every time the case comes apart, and at this price there is no reason not to.