Here we go again, another tough one... i noticed the differential fluid leaking from the pig on my 10-bolt. i thought it was the pinion seal so i cleaned it up real good and watched it dripping out. good news, its not leaking from the pinion seal. bad news, it is leaking from behind the nut/washer that holds the pinion yoke onto the spline !!! i'm 100% sure that is where its leaking because i removed the nut and washer and can see it dripping out from the splined shaft interface. i think i have that same issue on the harmonic balancer but thats for another day. how am i going to fix the pinion leak ?!?!? what if i buy a new washer and make sure it is clean there, and then crank it down really tight, will it seal ? or should i add some sealant there ? please help, these leaks are driving me crazy !!