transfer case rear output flange

[m-35tom]

I need to replace the rear driveshaft output yoke. Is all the oil in the trans going to try to get out? Do I need to drain the entire trans first?

 

[snowtrac nome]

No only oil in the rear bearing cavity will come out. you may loose a pint.

 

[m-35tom]

Does it just come out slowly then after the initial amount? How does oil get there?

 

[scottmandu]

Is the yoke physically damaged?

 

[m-35tom]

Yes, one ear is broken off. If it was not damaged I would not replace it.

 

[Suprman]

Why cant you just take the nut off and remove the broken yoke?

 

[m-35tom]

Yes that is exactly what I am going to do, but how much oil is going to come out?

 

[Suprman]

None should come out you are not opening the transfer case up just taking the flange off the output shaft.

 

[m-35tom]

The seal runs on the part I am removing so it should be open to the inside of the transfer.

 

[snowtrac nome]

The bearing is lubed with trans oil pressure there is a cavity behind the seal that will hold a pint or less of oil and that is all that's going to come out unless you start the truck.

 

[m-35tom]

OK that makes a lot more sense but if it is lubed with pressure where does it drain away to? Will that passage carry oil in opposite direction? Sounds like if I do it quickly I will not lose enough oil to matter.

 

[NDT]

Curious how the ear got broken off? Let me guess GP forklift rash? Hopefully the shaft is not bent or case cracked. Had to be an immense force to break that part.

 

[m-35tom]

Drive shaft twisted off the rear u-joint then fell from under truck breaking one ear off the front flange. Did not hurt the shaft.

 

[coachgeo]

Inspect close for cracks in Tcase housing and bell housing. Whatever caused the shaft to twist off..... before that finally happened must have been putting tremendous vibes thru all those housings...

 

[m-35tom]

I think it came from spinning one rear tire in the dirt and suddenly contacting pavement. i.e. abuse.

 

[tennmogger]

Tom, I have pulled the pinion yokes a couple of times. Probably on the output shaft yoke the challenge will also be breaking the nut loose from the shaft, and pulling the yoke off the shaft. You'll need a good impact, or long cheater bar, of course. I had to make a 'puller' to pull the flange, a thick steel plate (3/8" I think will fit between the oil slinger/protective flange and yoke) with a U groove to fit down behind the yoke and a bolt hole in each of 4 corners, four threaded rods to cover the length of a hydraulic jack, and another plate at the base of the jack. Said jack laid on it's side of course to push on the end of the pinion. The yoke was really on there. The whole truck seemed to jump and the jack and puller became airborne when it came off, so beware.

I can look up the lube seal number if you want to replace it (the reason I pulled mine). The original was a two piece seal, replaced by a one piece seal. There's a thread on it. [edit, on second thought the transfer output seal might not be the same as the differential pinion seal that I replaced] YMMV

 

[m-35tom]

OK, thanks, I have a 3/4 impact and some pullers that should work.