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AWD Front Diff/Axle/Transfer Case For the AWD Guys Front End

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Old Apr-11-17, 01:10 PM   #1
 
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Default Replacing Front Pinion Seal

Looks like my SS has the dreaded front pinion seal leak. My question is:
Can I change the seal without dropping the diff? If so how hard is it to remove the yoke and seal.

I already know there is no space to work in and I must mark the orientation of the nut to the yoke before removal and try to measure torque setting while removing any advise would be great, Thanks
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Old Apr-11-17, 04:03 PM   #2

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you are better off dropping the diff. Mine had what looked like a leak from the pinion seal. it was actually the case halves right above the pinion was leaking. I had to open the case and reseal it.

if it were me, i would pull the diff, inspect all bearings, reseal the case, and replace axle seals and pinion seal.

it dont take much of a leak to run them dry and ruin beaings.
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Old Apr-12-17, 05:34 AM   #3
 
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Thanks for the heads up,

The leak doesn't leave any drips in the garage floor but the end of the diff (where the pinion seal is) was wet. I noticed it when changing ball joints last month

When I changed the fluid there was only a half of a quart in it. I will just closely monitor and check fluid level until I have the time to pull the Diff later this summer.
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Old Apr-12-17, 01:09 PM   #4
 
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I re-sealed my case and did the axle and pinion seals at the same time as well. Is the best way to do it since the pinion seal isn't the only leak point. Been flawless for 10k+
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Old Apr-12-17, 05:49 PM   #5

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Originally Posted by walleyfisher View Post
Thanks for the heads up,

The leak doesn't leave any drips in the garage floor but the end of the diff (where the pinion seal is) was wet. I noticed it when changing ball joints last month

When I changed the fluid there was only a half of a quart in it. I will just closely monitor and check fluid level until I have the time to pull the Diff later this summer.
Front diff only holds a quart. You can be dry before it drips on the ground.

My oil pan and diff were wet. I was 1/2 quart low.
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Old May-27-17, 08:58 PM   #6

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What are you guys/girls using to reseal the diff? I pulled mine today and plan on doing all the seals and splitting the case. But wasn't sure what type of sealant to use. Also looking for pointers on the output shaft seal for the drive shaft.


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Old May-31-17, 09:55 AM   #7

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What are you guys/girls using to reseal the diff? I pulled mine today and plan on doing all the seals and splitting the case. But wasn't sure what type of sealant to use. Also looking for pointers on the output shaft seal for the drive shaft.


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Anyone use the green permatex for sealing the front diffs?


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Old Jun-01-17, 06:49 AM   #8
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I replaced the pinion seal in my front diff with it in the truck and the front drive shaft removed
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Old Jun-01-17, 07:57 AM   #9
 
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Not much room, I can hardly see the nut on the end of the yoke. How did you remove old seal and how did you get the new seal all the way back in?

Are you happy with the results?

Inquiring minds need to know
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Old Jun-01-17, 08:30 AM   #10

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I can see that being possible I was doing the pcm pick up so I decided to do all the seals and split the case and reseal while I had it apart. I can say anyone with an AWD better look at the carrier like right now. Stop putting it off mine was dry as a bone at the splines and I caught it before everything took a crap. Only 68k miles zero noise or indicators


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Old Jun-02-17, 10:45 AM   #11
 
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That's because the diff leaks at the pinion seal. Not many catch it unless it stays parked in the same spot on a dry concrete surface all the time or keep an eye on the bottom.

The oil pan seal(at the back corners) and the front diff pinion seal are most common known leaks.

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Old Jun-03-17, 03:54 AM   #12

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Quote:
Originally Posted by 1badbabyhauler View Post
What are you guys/girls using to reseal the diff? I pulled mine today and plan on doing all the seals and splitting the case. But wasn't sure what type of sealant to use. Also looking for pointers on the output shaft seal for the drive shaft.


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i used rtv ultra grey as its what i had on hand.
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Old Jun-03-17, 06:01 AM   #13
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Quote:
Originally Posted by walleyfisher View Post
Not much room, I can hardly see the nut on the end of the yoke. How did you remove old seal and how did you get the new seal all the way back in?

Are you happy with the results?

Inquiring minds need to know
I didn't even remove the drive shaft. I just unbolted it and pushed it over. Used the impact to remove the nut then it popped free with some gentle persuasion. The old seal pried out, tapped the new seal in and reinstalled the pinion, nut and shaft. Really only took me about a half hour. I have the LC32 engine cross member so it frees up tons of room. I'd imagine the stock engine cross member would have to be removed though.
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