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Old 06-06-2012, 03:18 PM   eBay Motors  #1 (permalink)
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Rear pinion seal suggestion

So I think my rear pinion seal went out on me. I knew it was starting to but I went on a little road trip and found oil all over the under side of the bed and all surrounding areas. Had to pull off constantly to top the pumpkin off with oil.

I did some searching on here and it seems do be kinda a hassle to replace. Not taking off the old and putting on the new, but getting that nut torqued correctly. My question to people who maybe has done this before is should I just take the truck in to somebody who "no shit" knows what they are doing? Or should I just take a wack at it myself. I'm pretty mechanically inclined. That's what I do for a living just on airplanes. I'm worried if I do it wrong it will become more of a pain in the ass. Don't want to take it apart 5 times to get it right.
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Old 06-06-2012, 03:42 PM   eBay Motors  #2 (permalink)
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you talking about the big seal on the back of the diff??? mine has always had a little moisture around it, so i'm going to subscribe to this
which nut are you talking about??
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Old 06-06-2012, 03:44 PM   eBay Motors  #3 (permalink)
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No not on the back of the pumpkin. The one where the drive shaft goes inside the pumpkin. There's a nut on the shaft protruding from the axle after you take the drive shaft off and get that big balancer off. I think it's a balancer.
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Old 06-06-2012, 03:58 PM   eBay Motors  #4 (permalink)
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oh i see. i have no idea. i've dropped the d-shaft before. but never messed with that seal. The one where the d-shaft goes into the t-case is also prone to going out.
May wanna do that one as well as a t-case pump rub kit all at one time
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Old 06-06-2012, 04:11 PM   eBay Motors  #5 (permalink)
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Its a two piece seal. Ones on the inside of the yoke and you have to replace the whole yoke. Its not to hard to get nut right though

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Old 06-06-2012, 04:25 PM   eBay Motors  #6 (permalink)
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You should be able to do it yourself. The first thing to do is mark where the nut is-- in relation to the pinion shaft. A center punch will work.

Now remove the the yoke [balancer] and seal. reinstall and tighten the nut to the exact place where the nut was before-- a tiny bit tighter will be OK, but never less than before. You can check the rotating force before and after with a dial torque wrench.

People mess up doing this-- by using a impact wrench and over tighten, or under tighten the nut. The torque on the nut, loads the pinion bearings.
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Old 06-06-2012, 05:29 PM   eBay Motors  #7 (permalink)
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Quote:
Originally Posted by jc1843 View Post
You should be able to do it yourself. The first thing to do is mark where the nut is-- in relation to the pinion shaft. A center punch will work.

Now remove the the yoke [balancer] and seal. reinstall and tighten the nut to the exact place where the nut was before-- a tiny bit tighter will be OK, but never less than before. You can check the rotating force before and after with a dial torque wrench.

People mess up doing this-- by using a impact wrench and over tighten, or under tighten the nut. The torque on the nut, loads the pinion bearings.


Normally, an impact gun is BAD NEWS on a pinion nut because of the crush sleeve. However, the crush sleeve on the 11.5s require such an astronomical amount of force to crush that the chances of over crushing the crush sleeve by putting the nut back on with a 1/2" impact are pretty slim.
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Old 06-06-2012, 05:45 PM   eBay Motors  #8 (permalink)
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That is true is you are installing a new crush sleeve. Replacing a pinion seal, most techs just replace the seal, and retorque to the original settings.
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Old 06-06-2012, 05:46 PM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by New to me GMC View Post
Normally, an impact gun is BAD NEWS on a pinion nut because of the crush sleeve. However, the crush sleeve on the 11.5s require such an astronomical amount of force to crush that the chances of over crushing the crush sleeve by putting the nut back on with a 1/2" impact are pretty slim.
I counted the turns when i took it off and spun it on there with a impact too. Checked it with dial and i was fine

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Old 06-06-2012, 05:57 PM   eBay Motors  #10 (permalink)
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That is true is you are installing a new crush sleeve. Replacing a pinion seal, most techs just replace the seal, and retorque to the original settings.

A 1/2" impact gun does not have the @$$ to crush a sleeve on an 11.5, Like i said, its against everything i was taught, but the 11.5 is more or less the exception to the rule and has a crush sleeve you almost cant fudge up.
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