2015 Silverado Front Diff

Trevor Technician Colorado Posted   Latest   Edited  
Resolved
Drivetrain
2015 Chevrolet Silverado 1500 LS 5.3L (C L83 Gas) 6-spd (6L80)
Output Shaft Seal Leaking

Good afternoon, DN. This is the first time I've posted here.

I am active duty military so I don't pay for shop software like Mitchell on Demand or anything because I don't turn wrenches on a daily like most of you do. I work on co-workers vehicles to try and stay up with newer technology the best I can. 

So let me get to the point. Driver side output shaft seal is leaking on a 2015 Silverado. I have never done a seal on this type of diff. Most of my experience is with military vehicles, and some civilian vehicles before joining the service.

When I take the bolts for the CV axle off, will I be able to pull the output shaft out of the diff? Is it being held in by a snap ring, kind of like it is with the traditional older GM transaxle? Or do I have to drop the entire diff and open it up in order to remove the axle shaft?

Thank you in advance

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Herman Owner/Technician
Ontario
Herman
 

These are clipped in like most gm ifs diffs however uf it won't come with a big bar and a smart whack you're gonna have to pull the diff out. Place it vertical and with a BIG SLIDE HAMMER TAKE IT OUT. The 2500s are even worse.

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Trevor Technician
Colorado
Trevor
 

Thank you so much. This truck only has 60k miles on it so HOPEFULLY (fingers crossed) it won't give me too much grief haha. Thanks again for your reply

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Caleb Diagnostician
Indiana
Caleb
 

It should come out. If it does not you will have to remove the diff and split case and pound it out from the backside.

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Mark Engineer
Colorado
Mark
 

Trevor Others have already offered great tips and procedures so I’m going in a different direction. With only 60k on the odometer why do we think the seal failed? I take care of fleets with just under 500k miles and we usually don’t see seal failures until slightly over 315k. Your thoughts

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Trevor Technician
Colorado
Trevor
 

Thank you for your reply!

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Bill Owner
Maryland
Bill
 

Pretty common problem from what I hear. I replaced the one in my 99 Tahoe only to find out that it was a clogged vent line building up pressure. It runs up to the radiator support on mine and has a little breather on the end.

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Agree
Trevor Technician
Colorado
Trevor
 

Thank you for that. That makes sense actually. I'm glad you brought that up. I'll take a look at that when the vehicle come back for repair

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Mark Engineer
Colorado
Mark
 

Bill You mentioned, I replaced the one in my 99 Tahoe only to find out that it was a clogged vent line building up pressure I would think 21 to 22 years of service is reasonable and you're right, more pressure in the differential due to a vent problem would probably accelerate failure. We hear from Trevor this 2015 only has 60k miles so I'm concerned there is another root cause. Your…

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Bill Owner
Maryland
Bill
 

Mark, Mine actually was leaking when the truck was fairly new. Looked like a spider had made a nest in it. Probably 50k miles or so ? Have not had a problem since and it is getting close to 270K Have changed all of the fluids once around 150k.

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Michael Technical Support Specialist
California
Michael
 

Back in the day, we had a repeat failure on a rear diff seal on an older 2wd Ford, It turned out to be caused by a plugged diff seal. As it warms, the internal pressure builds and find the easiest way out.

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Trevor Technician
Colorado
Trevor
 

You are absolutely correct. Thank you for your input

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Trevor Technician
Colorado
Trevor Update
 

I'd also like help finding out which ring gear the front diff has so that I can order the seal. Any help is appreciated

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Bill Owner
Maryland
Bill
 

Trevor, Look up the seal by the vin on GM Parts Giant.

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Helpful
Michael Owner/Technician
Alaska
Michael
 

Do you have an auto skill center on post where you can work on personal vehicles? If so, they should subscribe to shop key or alldata. It's paid for by MWR, so should be free for you to use.

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Trevor Technician
Colorado
Trevor
 

Yes we do. Those guys aren't always approachable so I don't ask many questions. I usually pull the vehicle in, knock it out and leave. I'll ask next time I'm in there. I usually have the customers bring their vehicles to my house because that's where my tools are. I have a super old version of Alldata but it only covers 1981 to 2006. It was awesome to have back a few years ago, but it's doing…

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Jerry Owner
Washington
Jerry
 

Most of your local libraries have access to Alldata or Mitchel.

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Trevor Technician
Colorado
Trevor Resolution
 

Thank you, all. I also learned that the MWR has Haynes manuals online.

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