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Old May 30th, 2009, 11:15 AM   #1
Ebs
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Default Can't stop t-case leaking from tailhousing seal

The slip yoke seal in my truck (push button np243) was leaking so I replaced the seal a few weeks ago and no change, it leaks just as bad.

Any clues whats going on before I try another seal?
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Old May 30th, 2009, 11:32 AM   #2
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yeah check your driveshaft where the seal rides. A lot of time on older trucks the steel on your slipyoke will wear down and your seal will not contact it good enough. If its wore replace it if its not then maybe your output shaft is loose and letting it slop around and wearing seal prematurely.
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Old May 30th, 2009, 02:00 PM   #3
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Is the truck lifted? Incorrect drive shaft length will wear the splines & let the shaft slop around & take out the seal.
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Old May 30th, 2009, 03:55 PM   #4
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I put an add-a-leaf in the rear about a year ago, so it only sits about 1-2" higher than stock. If the yoke is pulled out a little from that then the seal should be on the fresh clean surface of the yoke that was once further back in the tailhousing.

My thought was that the output shaft has some play in it, I didn't feel any movement when I was changing the seal though. However, when I got the truck I did only find about a quart, if that, in the t-case so who knows what kind of shape the internals are in.
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Old May 31st, 2009, 10:52 PM   #5
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Quote:
Originally Posted by rargreen View Post
Is the truck lifted? Incorrect drive shaft length will wear the splines & let the shaft slop around & take out the seal.
Quote:
Originally Posted by Ebs View Post
I put an add-a-leaf in the rear about a year ago, so it only sits about 1-2" higher than stock. If the yoke is pulled out a little from that then the seal should be on the fresh clean surface of the yoke that was once further back in the tailhousing.
Wow, I read that wrong. Makes sense, more lift = less spline engagement.
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Old June 1st, 2009, 12:12 AM   #6
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right behind the seal is a bronze bushing. if the bushing is worn out it will allow the slip part of the shaft to cock in the housing and leak fluid.

real common on chevys too.
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