9.5" 10.5" or 11.5" rear end pinion seal option

[VipeRTBlck]

pinion seal is leaking and im going to replace it, autozone said i have those 3 options(9.5, 10.5, 11.5), advance auto parts said it's a 10.5" anybody know?? also, once i remove drive shaft, and take nut off pinion; will the yoke slide right off or is it a pressed fit??

[CNY6.5TD]

The diesels all have the AAM 11.5"

[VipeRTBlck]

what's aam? and is there anyway i can confirm the 11.5"?

[VipeRTBlck]

40006189 G18 GSC is cast into the rear end housing itself; does this help or mean anything?

[Shadow1]

Yep 11.5" ring gear, 14 bolt cover. AAM manufactures the axle and it has an Eaton G80 differential in it -- some few have open differentials.

Now this is for a Duramax or 8.1 liter gas engine.

CNY6.5TD, I believe, works on drivelines professionally so he's a credible source for information.

[CNY6.5TD]

Originally Posted by Shadow1

Yep 11.5" ring gear, 14 bolt cover. AAM manufactures the axle and it has an Eaton G80 differential in it -- some few have open differentials.

Now this is for a Duramax or 8.1 liter gas engine.

CNY6.5TD, I believe, works on drivelines professionally so he's a credible source for information.

I build driveshafts and work in a machine shop that does a wide array of repair and fabrication and the business is coupled with a truck shop that builds Fuel oil delivery trucks. So i do very little "professional repair" on duramax trucks, but im a chevy guy and try to stay up on the stuff.

Its pretty simple though, 2500hd trucks have the 10.5 with 6.0s and 11.5s with a duramax or big block.

[403DMAX]

Originally Posted by VipeRTBlck

pinion seal is leaking and im going to replace it, autozone said i have those 3 options(9.5, 10.5, 11.5), advance auto parts said it's a 10.5" anybody know?? also, once i remove drive shaft, and take nut off pinion; will the yoke slide right off or is it a pressed fit??

Hey bud, you def have the 11.5" American Axle Manuf. as others have stated. The pinion nut is on with a sealant/loctite originally from GM, so there will be much resistance when you attempt to remove it. You may want a puller to remove the yoke. A simple bolt style puller will work so you an thread the bolts into the ears of the yoke and place the center cap of the puller on the tapered hole in the pinion shaft. You will lose some fluid so have a qt of 75W-90 synthetic on hand to replace. Good luck.

[VipeRTBlck]

sounds good; thanks for everybodies help so far!

[VipeRTBlck]

well i was ready to buzz the big nut off today with an impact and found out it's a size that i dont have(go figure) my 1 1/4" is too small, and 1 1/2" is too big, anybody know what size i need? I'm sure I can find it at work(bein an odd 12 point nut this big).

Also is there an actual torque spec for reinstalling this nut, or should i be ok just buzzing it up with the impact and not OVERTIGHTENING it? I've done this task on a half ton before and just buzzed it up, it's still fine to this day and that was 5 or 6 years ago.

thanks again in advance

[CNY6.5TD]

Originally Posted by VipeRTBlck

well i was ready to buzz the big nut off today with an impact and found out it's a size that i dont have(go figure) my 1 1/4" is too small, and 1 1/2" is too big, anybody know what size i need? I'm sure I can find it at work(bein an odd 12 point nut this big).

Also is there an actual torque spec for reinstalling this nut, or should i be ok just buzzing it up with the impact and not OVERTIGHTENING it? I've done this task on a half ton before and just buzzed it up, it's still fine to this day and that was 5 or 6 years ago.

thanks again in advance

Im not sure what size the nut is. Normally i would just hammer on a used crush sleed with an impact, but you should be fine buzzing the nut back on snug with an impact. I havent set up an 11.5 yet just changed a few pinion seals, but from talking to the guys that have set em, your not going to over crush that crush sleeve with any run of the mill impact gun.