8-3/4 Pinion Seal replacement question.

[lochenjons]

Leaky pinion seal on a 742 case 8-3/4. Got the seal at home. Do I have to replace the shims when I replace the seal? Or does it depend on the thickness of the seal? Sorry for the noob question... never done a pinion seal. I got the service manual for my car at home but I won't be back until Friday... trying to order parts if I need to sooner than later. Thanks

 

[62MAX]

No need to do anything but re torque pinion nut to factory specs.

 

[lochenjons]

No need to do anything but re torque pinion nut to factory specs.

Thanks for the reply, got it !

 

[67belvedere/225]

you need to take a punch and mark the nut and the pinion, you take it off so you can reposition it a hair further.
so you keep the preload on the sleeve inside. when you have the flange off , I suggest to inspect it for wear.
they do make a thin sleeve that you can buy to press onto the flange so seal will rest on that instead of grooved flange

 

[67belvedere/225]

I just did one on a jag . like this

 

[493 Mike]

you need to take a punch and mark the nut and the pinion, you take it off so you can reposition it a hair further.
so you keep the preload on the sleeve inside. when you have the flange off , I suggest to inspect it for wear.
they do make a thin sleeve that you can buy to press onto the flange so seal will rest on that instead of grooved flange

If the pig was a 489 (with a crush sleeve) I like to add a .010" shim on the small end of the sleeve and crush the sleeve another .010" to achieve the correct pinion bearing preload with out extra disassembly. Since this question pertains to a 742 the #2 response is correct.
Mike

 

[khryslerkid]

Here's the 742 that I replaced the seal on...post #538 Read on to the next page also.

https://www.forbbodiesonly.com/moparforum/threads/taking-up-new-residence.114133/page-27

 

[lochenjons]

Will do thanks, Before I really knew what I was doing I tried to impact the nut off. So I’m pretty sure it’s not where it’s supposed to be so I probably can’t mark it

 

[khryslerkid]

Will do thanks, Before I really knew what I was doing I tried to impact the nut off. So I’m pretty sure it’s not where it’s supposed to be so I probably can’t mark it

On a 742 you don't need to mark it. Just torque it to specs. The factory service manual says 240 ft lbs. Try to get it close to that.

 

[lochenjons]

Will do, got the rear diff in yesterday, she's slowly coming together. thanks for your replies guys

 

[67belvedere/225]

nothing like having a beer and working on your car