I found my rear pinion seal has started to leak. I also noticed on my last trip that there was an intermittent vibration under load. What I know I need is the rear pinion seal part number and I probably will need a pinion bearing...part number. I will check for play back there today. I figure since its time to service the rear diff I should make sure there isn't a problem in there at the same time.

The truck is an 07 3500 dually 4x4.

Thanks

Suggestions where to source this would be nice. Sometimes the dealer is good...sometimes...not so good.

 

You might try Rock Auto, they normally have some good prices.

 

Pinion seal number is 26064030
Pinion nut number is 40003027
Crush Sleeve number is 12471647
Outer bearing cup number is NP926068
Inner bearing cup number is HM807010
Outer bearing number is NP457992
Inner bearing number is HM807046