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Ok, so I feel kinda dumb asking this, but....

R

ragedracer

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First, 86 CUCV M1009 - TH400/NP208. The output from the transmission/transfer case where the slip joint of the rear driveshaft goes in is leaking. I know I need to replace the seal, but I don't know what seal to get. Do I look for an output shaft seal for a TH400 or the NP208? Whats leaking out is ATF, but both the Trans and the Transfer case use ATF! #1, I want to make sure I get the correct part; #2, I want to be sure which unit I'm losing fluid from!

rr
 
hey take pics of the seal replacement cuz i need to do one to. and im a noob when it comes to tranys/ t-cases
 
ragedracer said:
First, 86 CUCV M1009 - TH400/NP208. The output from the transmission/transfer case where the slip joint of the rear driveshaft goes in is leaking. I know I need to replace the seal, but I don't know what seal to get. Do I look for an output shaft seal for a TH400 or the NP208? Whats leaking out is ATF, but both the Trans and the Transfer case use ATF! #1, I want to make sure I get the correct part; #2, I want to be sure which unit I'm losing fluid from!

rr
Click to expand...
Slip yoke leak = t-case output shaft seal.
 
So, I've been searching around the board now that I know what I'm looking for.. I wonder if its that seal or the yoke seal thats leaking? The drips seem to be coming from around the u-joint area, which I just assumed thats where they fluid was migrating too. Now its got me thinking maybe its not what I thought it was?
 
It will be that seal, it is just migrating when the driveline is running. It is a very common leak point on the TC.
 
should i replace the bushing as well while I'm at it, or just the seal? Sounds like the bushing replacement entails pulling the tailshaft housing, right? Is it worth the effort?

Thanks for the quick replies BTW!
 
Unless you find movement in the tailshaft, there should be no need to replace the bushings. If the tailshaft has a bunch of movement in it, you will need to do the bushings. If the bushings were bad, I would suspect that you would feel some major vibration from the driveline.
 
Just the seal then, it sounds like. The driveshaft is solid as a rock, and she cruises at ~70mph with no vibrations at all.

rr
 
Sound like you have your answer. The bushings usually last a long time, because the ATF flows pretty easily to keep them coated. At least it is an easy fix.
 
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