Jim Grant's Tech Tips
'90 Chevy S-10 Blazer, Rear Axle Seal
Q:
What
parts are required for the rear axle seal replacement on a '90 Chevy S-10
Blazer?
-
Justin
A:
When
replacing a rear axle seal on a vehicle of your type I would suggest replacing
both. Why? The biggest part of the job is getting the rear axle out so
the seal can be removed. Once you're to that point it only takes about
15 minutes at best to replace the other seal. It would be a shame to have
to go back in six months later and do all that work again to replace the
other seal. After all they have both lived in the same environment for
the same amount of time. If one seal has failed the other is likely not
too far behind. Be sure to inspect the axles and bearings wear. The area
where the bearing contacts the axles can be a problem. If there is wear
it is suggested to replace the axle and bearing, but there is an aftermarket
fix that repositions the bearing to allow it to contact a different area
of the axle. This saves the cost of a replacement axle. You'll also want
you have a replacement lock bolt for the differential gear shaft. This
little bolt is known for breaking at just the wrong spot creating all
kinds of removal headaches. When all is said and almost done, you'll need
a way to pump gear oil back into the differential. Parts to have on hand;
2 seals, lock bolt, silicone or replacement gasket for the differential
cover and about 4 pints of gear oil. Good luck and I hope it goes smoothly.
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