73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => 4 Wheel Drives => Transfer Cases and Front Drivelines => Topic started by: 440sixpack on July 10, 2019, 11:35:09 PM
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My k10 has a 700r4 with a NP241c behind it. both were fully rebuilt not long ago and have worked perfectly. now sometimes I see drops of ATF coming off the u joint on the rear output.
It absolutely isn't the seal, it's bone dry. but I see there is a soft plug looking thing in the yoke. is it possible the oi could be leaking from that? I can't see it but I can't think of anyplace else it could be. I'm not sure what's behind it.
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generally if its the yoke it will fling trans fluid up on the bed. what style output shaft does the t-case have? i imagine its a slip yoke but idk. i know we've talked about it before on here about an o-ring on the output shaft, try using the search button. im going to look myself but i haven't found it yet
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yes it's a slip yoke. and yes there is a little oil on the bottom of the cab.
I wondered if there was an o ring. if there is that's probably it.
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I pulled it out and it turns out there is no o ring. but the leak is coming from oil seeping around the edge of the soft plug in the yoke.
I covered it good in The Right Stuff and I expect that will be the end of it. if not I'll do something more durable.
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you can plug the hole but as the suspension moves the slip yoke will travel in and out of the trans and will blow the sealant out. heres a write up on the weep hole, i know theres a few that have had this issue but pretty sure theyre 4x2 not 4x4. i dont know if its the same setup or not.
http://73-87.com/7387garage/drivetrain/yokeleak.htm