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Would this be the NP203 output shaft seal?

Discussion in 'The Garage' started by AZOffroad, Mar 5, 2006.

  1. AZOffroad

    AZOffroad Registered Member

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    Location:
    Gilbert, Arizona
    Hi,

    I've got a '78 K5 that is completely stock (except for 4" lift and 35" _tires).

    I'm getting a fluid leak that drips off of the rear driveshaft's front u-joint after a couple days of sitting. It stands to reason that the source is the output shaft of the NP203. Does that sound correct?

    Assuming it is a seal, is this a difficult part to replace? Does it mean pulling the t-case and cracking it open to install the seal, or can it be done without going into the case?

    Any other advice or thoughts about this kind of leak?

    Thanks,
    Steve

    '78 K5 400ci/TH400/NP203 Daily Driver
    Gilbert, Arizona
     
  2. mouse

    mouse 1/2 ton status

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    To change the rear seal on a stock 203, you have to remove the nut that holds the output yoke, and then carefully remove the seal. They are usually in there tightly, and over-zealous use of a seal removal tool can scar the aluminum seal surface in the TC. Work slowly and carefully. Its not a difficult job, but does require removing the rear drive shaft, a large socket for the nut, ans something to remove the seal (its just like the front seal in a timing chain cover).

    BTW this is a common place for the 203 to leak.
     
  3. AZOffroad

    AZOffroad Registered Member

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    Ok, sounds like a simple fix - that's good news. Thanks.
     

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