How do I change my 12 bolt pinion yoke? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-01-2009, 02:51 PM
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How do I change my 12 bolt pinion yoke?

I have heard that if I do this incorrectly I can ruin my rear end?

Are there special tips to change it out or should I really hire someone to do it?

I am upgrading to a 1350 u-joint, which is why I am switching it out.

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Old 09-01-2009, 04:00 PM
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You can't just re-install the new piece. The pinion bearing pre-load has to be checked and set. Usually requires a new crush sleeve.
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Old 09-01-2009, 04:03 PM
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I have not done that before, so is it something I can be walked through?
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Old 09-02-2009, 03:00 AM
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i have removed and replaced a few 12 and 10 bolt gm yokes in the past and never had any issue

techniclaly youre supposed to replace the crush sleeve once the yoke has been put on and the nut torqued down and therefore pre-loaded the pinion bearing

but i almost always get away with carefully tightening the nut and until its just tight and then a little bit more as to barely chush the sleeve anymore at all

and never had any problem

but thats not what your suposed to do.

but it works..

you just have to carefully feel it out

hard to explain here.



have fun.
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Old 09-02-2009, 10:04 AM
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Quote:
Originally Posted by fast68
i have removed and replaced a few 12 and 10 bolt gm yokes in the past and never had any issue

techniclaly youre supposed to replace the crush sleeve once the yoke has been put on and the nut torqued down and therefore pre-loaded the pinion bearing

but i almost always get away with carefully tightening the nut and until its just tight and then a little bit more as to barely chush the sleeve anymore at all

and never had any problem

but thats not what your suposed to do.

but it works..

you just have to carefully feel it out

hard to explain here.



have fun.
I am going to try and avoid this method, mainly because of how much I just spent on the rear end.

But that may work for getting the car the shop.
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Old 09-02-2009, 10:43 AM
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You can do it yourself if you have an inch pounds torque wrench.
When you crush the sleeve you need to set it so that it takes 25-30 inch pounds of force to turn the pinion nut.
I believe I did mine with the wheels off. Not sure it makes a difference.
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Old 09-02-2009, 11:58 AM
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25 to 30 might be a little tight for used Brgs. And to be correct, you would set the inch pounds with No axles in the diff.

Do as fast68 said with clean thread's and use red lock tight on the nut. You can also put a little silicon on the back side of washer that goes behind the pinion nut. It will keep oil from leaking out the center of the pinion yoke and also help with crushing the sleeve that little bit.
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Old 09-02-2009, 01:41 PM
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Quote:
Originally Posted by prostreet6t9
25 to 30 might be a little tight for used Brgs. And to be correct, you would set the inch pounds with No axles in the diff.

Do as fast68 said with clean thread's and use red lock tight on the nut. You can also put a little silicon on the back side of washer that goes behind the pinion nut. It will keep oil from leaking out the center of the pinion yoke and also help with crushing the sleeve that little bit.

Its been a while since I changed it. I forgot about having the axles out.
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Old 09-02-2009, 02:55 PM
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Flat rate trick. Hold the yoke with some type of fixtures so it won't turn, we had a bar made up that bolted to the Ujoint holes. Remove the pinion nut using a torque wrench, note the torque needed to start the nut turning. Remove the yoke, replace the seal, install the new yoke, and tighten to 2 lbs more than the torque to remove the nut. Works every time as long as everything is clean.
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