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[david.varady]

kind of stumped about my yj, replaced the pinion seal because it was leaking on the rear end and had to put a yoke on too. now there is a grinding noise coming from the rear end when i drive it, also had to replace both outer axle seals as well. any idea's on what that grinding noise might be? thanks David.

[Nosebolt]

first instinct would be you didn't do the yoke nut tight enough

[Dave The Sparky]

I think you need to jack it up in the air and spin the wheels by hand first (preferably on a ramp), may just be brake related as you must have had them in pieces to do the seals as well.

[david.varady]

i made sure the pinion nut was tight enough, and i'll try spinning the wheels when it is jacked up. I'll see were that gets me
 

[Ric Jacques]

Mate when you say you made sure it's tight enough - did you actually apply the necessary torque figure?  It's possible to either not tighten it enough, or over tighten it which will apply too much preload to the bearing.

[Lornaben]

 

and hello Ric, long time no see.

[Ric Jacques]

Hey yeah I know 

Too long. 

[Lukemagnum]

Don't mess around with axles unless you really know what you're doing. You need to insert a new collapsible spacer if you disturb the nut on the end of the pinion to allow the pinion and crown to mesh correctly.

I tried this years ago with a van I had, even after a few attempts, putting in a new spacer, re-torquing, doing it by the book etc, etc, after a few miles it started to sound like Dr Who's Tardis taking off.

In the end I replaced the whole axle, lesson learnt. 

[Ric Jacques]

I remember when I overhauled my CJ driveline the torque figure was quite high.  It's also important to remember to fabricate an anti rotation holding lever for the yoke so as not to transfer the torque through to the gears, as this can cause tooth fractures.

Do it right, do it once

[Bubba]

i think it may be a bit tight you may now need bearings seal and crush sleeve

[Dave The Sparky]

If it is then early axles must be far better for us amateur mechanics with the shims instead of a crush sleeve.

[Bubba]

you would think so but funlly dana 30 come in both flavours crush and shim dependant on age model and amc 20 is crush