Pinion support leaks.

[JimNolan]

Alright guys I need some help here. PLEASE. When I put a 1350 yoke on my Moser 9" rear differential, I obviously did something wrong. It leaks now. The pinion came apart just fine and it had these tiny thin metal spacers between the pinion support and the case. There was no gasket of any kind. I just cleaned it up put the spacers back in place and bolted it down using a cross torque sequence that would seem natural. Now it leaks. Was I suppose to use any kind of gasket sealant on it during assembly? I know the seal for the Tremec input shaft uses a special thin film of gasket sealant that comes in a tube.

[ScotiaFE]

It's the O ring. The O ring that fits around the outside of the pinion support.
You either nicked it or rolled it.
Next time try a smear of light grease on the O ring and gently work it in the bore.
They even make a fancy tube of O ring grease if you want to get really picky.

[JimNolan]

I remember that O-ring and never touched it. Thanks, I can replace that and apply grease next time. I didn't apply any lubricant to it when I re-installed it. Thanks