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2007 Chevrolet Trailblazer Front Differential

Tiny
DSDALE
  • MEMBER
  • 2007 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 264,000 MILES
Seal leaking after replacing gear oil, plus more noise after it was done. Was not leaking when I did the service, but I know the fluid was low. Can replacing the gear oil blow out the seals? Also it calls for synthetic 75w/90, but what happens if you use 80w/90? I live in southeast so temperatures are not that much of a factor. I just need what is the potential issues.
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Tuesday, January 20th, 2015 AT 12:21 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for a blocked vent on axle that will blow seals it goes up cross member. The other you should use as it's synthetic oil so better for it. With the mileage I assume it was low prior to you changing it so it cold be a bearing.
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Tuesday, January 20th, 2015 AT 12:27 PM
Tiny
DSDALE
  • MEMBER
  • 2 POSTS
It was changed prior to the mileage listed, the last time it was changed was 2yrs ago. I was told the 80/90 with some limited slip added would suffice. Just wanting to see if that was valid.
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Tuesday, January 20th, 2015 AT 12:37 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Ya there isn't a problem with the fluid it's ok to use.
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Tuesday, January 20th, 2015 AT 1:23 PM

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