anybody tackled the transmission output shaft seal - Printable Version
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+--- Thread: anybody tackled the transmission output shaft seal (/showthread.php?tid=8717)
anybody tackled the transmission output shaft seal - rvguy - 10-14-2025
allison hd4060 transmission output shaft seal leaking. Looks like a pretty straight forward job. Has anyone done this repair on there own ?
RE: anybody tackled the transmission output shaft seal - Richard - 10-14-2025
Adam,
I have not, but my input is related. I had a catastrophic incident pulling into a campground when the input yoke to the tranny came loose, fell out of the tranny, and took half the driveshaft with it.. The yoke had been attached to the output shaft with Allen head screws. I suppose someone had done that because it is a difficult place to access with a wrench or a socket.
However, there is not a good way I know of putting a keeper on an Allen head. So I went back with grade 8 hex head bolts. I make a keeper to put under the bolts, and bent up the tabs when I had them tight.
Had the driveshaft fallen out five minutes earlier on the freeway, it would have been much worse.
RE: anybody tackled the transmission output shaft seal - Jack Houpe - 10-15-2025
Oh Richard I will have nightmares tonight thinking about that.
RE: anybody tackled the transmission output shaft seal - rvguy - 10-15-2025
Well i guess when I take it apart I will look at that possible issue as well
RE: anybody tackled the transmission output shaft seal - rvguy - 10-16-2025
Richard you hit the nail on the head. Pulled my driveshaft assy and both retaining bolts were broke off in the output shaft letting the yoke extend way out past the seal. Suprised we did not loose the driveshaft and cause major damage. was able to extract the broken bolts luckly no damage to the yoke. Replaced the seals, bolts and did what you said locktited them in and made a retaining clip for the 2 bolts.
RE: anybody tackled the transmission output shaft seal - Jack Houpe - 10-16-2025
Thank God you caught it before it happened.
RE: anybody tackled the transmission output shaft seal - Richard - 10-16-2025
It’s possible that the yoke wallowing around is the root cause of the seal failure.
RE: anybody tackled the transmission output shaft seal - rvguy - 10-19-2025
(10-16-2025, 04:25 PM)Richard Wrote: It’s possible that the yoke wallowing around is the root cause of the seal failure.
so all that was left engaged in the trans was about 1" of yoke. Heck I dont think it was even touching the seal.
RE: anybody tackled the transmission output shaft seal - [email protected] - 10-19-2025
FYI, depending on the differential sometimes the yoke torque value is very important to the assembly of the carrier. It often affects the tolerances in the carrier assembly. Just keep this in mind.