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How to replace a transmission rear seal on a 1994 chevy K1500

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  • Chevrolet Master
  • 1,209 Answers

This should be a fairly straight forward easy job. You will need to block the wheels, or jack up the truck and set securely on jack stands. Remove the drive shaft by removing the u-joint straps and prying u-joint away from pinion. Make sure you do not let the u-joint caps some off of the u-joint as they are filled with many needle bearings that you do not want to loose. when you get the u-joint free of the pinion it is a good idea to wrap a piece of tape around the u-joint to keep the caps in place. Then you simply have to pull the drive shaft back to slide the front out of the transmission. Then you can get a small chisel around the lip of the seal and the back of the transmission tail shaft and pop out the old seal and then install the new one. Put the drive shaft back in and you are done.

Posted on Apr 21, 2013

  • 4 more comments 
  • michaelfanni
    michaelfanni Apr 21, 2013

    hey thank you for your help. I would like to know whether or not this solution is for a 4x4 or a 2wd?

  • michaelfanni
    michaelfanni Apr 21, 2013

    because i have a transfer case.

  •  Dan Hooper
    Dan Hooper Apr 21, 2013

    Ahh, well that makes a bit of difference. you will need to remove both the front and rear driveshafts, which is not too much different from removing one, you will need to unbolt both ends and make sure you tape the free ends of the u-joints. then you will want to unplug all of the electrical connections to the transfer case and unhook the linkage from the 4wd shifter. it might help when you go back together to clean a spot where the transfer case meets the transmission and mark it with a sharpie, or scratch it with a screwdriver to help in aligning it when going back together. Unbolt the transfer case and seperate it from the trans. On a 4wd tour rear seal is a paper gasket between the tranny and the transfer case.

  • michaelfanni
    michaelfanni Apr 21, 2013

    Thank you very much!!

  •  Dan Hooper
    Dan Hooper Apr 21, 2013

    make sure you scrape all of the old gasket from the back of the trans and the face of the transfer case, but do not gouge the aluminum. when you put the new gasket in put a very light film of ultra black RTV permatex to both sides of the gasket. The trans gear oil can break down other silicone, but the ultra black is engineered to stand up to oils and solvents. This will just ensure a good long lasting seal.

  • michaelfanni
    michaelfanni Apr 21, 2013

    will do!

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