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You must remove the drive shaft. But first block the wheels so truck don't roll.

Now take a screew driver a hammer and drive the seal out, you will loose some fluid but not much. If your good you can drive the new seal in with a hammer. If not they do make a seal driver that a parts store might rent you.

If you still have a leak and your sure its coming from the seal and not the yoke on the drive shaft. Then the bushing in the trans. behind the seal needs replaced, and that can be trickey. Don't forget to polish the yoke on the drive shaft were it slides into the trans. GOOD LUCK

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Q: How do you put a rear transmission seal in 90 Chevy 1500?
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