Question about Chevrolet Silverado 2500HD

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How do i replace the rear seal on my allison transmission in my 2001 gmc sierra duramax

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  • Tabitha Tennenbaum Jun 18, 2013

    I am completely inept when it comes to cars. I have been having trouble with my transmission and am looking for a Allison Transmissions authorized dealer. Does anyone have suggested shops in Alberta?


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Pop it out with i screwdriver.gently align new seal and tap it in with a block of wood straight..

Posted on Jan 17, 2013

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Posted on Jan 02, 2017

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SOURCE: My 2001 GMC duramax with

Thanks for choosing FixYa and welcome to the site. The first thing you need to do is check your transmission fluid. Make sure it is at the correct level. You may need to change the fluid and change the filter. If you haven't did this, I would advise you to do it. You would be surprised to see the difference, if that is the cause. It is very hard to diagnose a transmission problem because there is no way to find out other then taking it apart. It could be damged teeth, seal, ect. It is possible that you have a bad torque converter. But the only way to know for sure is looking at it or having a mechanic look at it. Now, the transmission should throw a fault code. If your check engine light is on, this may be the reason why. If so, you need to take it to Autozone or Advanced and have the codes read. It may tell what is wrong. If there is no check engine light, it is possible that you may just need a fluid change. I would change the filter and fluid first. Transmission maintenance can be very expensive. Shifting can become hard if there is low fluid or you need a new filter. Pay attention to the housing and see if it is leaking any fluid. This could be a sign of a bad seal. The transmission also has sensors that can fail. If the fluid change doesn't help, your only option is taking it off yourself or haing a mechanic do it for you. This is just one of those things that you need a hands on experience to know the exact cause of your problem.

Posted on Jul 25, 2011

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SOURCE: duramax in a 1993 2500

sure if you have all the computers and wire harnes.

Posted on Oct 13, 2008

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SOURCE: location of speed sensor 2001chevy silverado 3500

Depending on what transfer case model you have,some have one sensor and some have 2.They will both be on the back of the transfer case.They will be on the tail shaft of the transfer case.The one with 2 sensors has one on the left and one on the right.Hope this helps.Good luck.

Posted on Dec 26, 2009

  • 312 Answers

SOURCE: location of speed sensor 2001chevy silverado 3500

above were your electrical plugin plugs up on the rear left of transmission. that is your output shaft speed sensor.

Posted on Dec 27, 2009

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above were your electrical plugin plugs up on the rear left of transmission. that is your output shaft speed sensor.

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