06 Envoy xl front end leaking - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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Old 09-04-2019, 08:35 PM
Casey590 Casey590 is offline
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Join Date: Aug 2019
Posts: 1
06 Envoy xl front end leaking

The gear oil is leaking in the front differential is there anything to do besides replacing?
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Old 09-04-2019, 11:23 PM
EnvoyBoy2004's Avatar
EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
Join Date: Sep 2014
Location: NY
Posts: 2,084
Depends on where its leaking. Is it from one of the axles or the the case itself. For an axle leak it could be the seal.
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Old 09-12-2019, 03:02 AM
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rcott01 rcott01 is offline
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2004 GMC Envoy SLT XL
Black 4.2L I6 4X4
Join Date: Feb 2016
Location: Eaton, OH
Posts: 61
Unfortunately these things are known for leaking. I would suggest to remove the front differential and replace both seals and reseal the case. The last time I had my engine out I replaced the outer seal because I noticed it was dry rotted then after about 2000 miles I started getting a leak that looked like it was coming from the oil pan but was the inner seal leaking. These are a royal pain to remove from the truck, so when you have it out learn from my mistake and do both seals and the case. The case is very easy once it's out of the truck. Lay it on its side and remove the bolts and the case separates. Both of the ones I did didn't seem to have any kind of sealant at all on them, so I used a very thin layer of black rtv on it and bolted it back together. It's been about a year now and no leaks. Good luck
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