Rear driveshaft play at transfer case

[GasFree]

Hey guys,
Going through the truck before a trip I notice I need u joints for the rear shaft. Also seeing movement where the shaft slips into the transfer case. Haven't ever had to fix anything there so I'm assuming there is a worn bearing in the TC. If so that's probably what helped wear out the u joints. The play isn't to to bad but the trip is 1500 miles so I should probably fix now. Any input for this will be appreciated. Thanks in advance.
Scott

 

[Agnem]

Scott, too bad you missed last years rally. Heath did a clinic on how to rebuild a transfer case. Yes, there is a big fat bearing inside the case, and it is probably bad, but I think your diagnosis is backwards. When a U-joint wears, it can allow the shaft to come off center which creates a vibration as it spins. This tends to want to egg out things, and the xfer case bearing is taking a lot of the abuse. Ironically, the Moose Truck started spitting out U-joint needles on our way home from that rally, and I had to do a complete U-joint replacement at a friends house 7 hours from home.

 

[GasFree]

Thanks Mel. Got the drive shaft off and the tc output shaft doesn't seem loose. Looked at my shop manual and the bearing doesn't look too bad to do. I'll get it and a new seal with the joints and be done with it. Just have to pick up a (another) pair of snap ring pliers. Too many task specific tools get misplaced over the years. Saw this problem while replacing the rear brake line...pita. Yea traveling has become an adventure, lost the water pump bearing on the trip down here, sidelined me for two days getting that done then hit the road only to lose my brakes later that day...thankfully didn't go when coming to a hard stop, then limped here w/ the e brake. Thanks again for your input.
Scott

BTW I would have really liked the tc clinic Heath did, I've had a perpetual leak for years that needs monitoring.

 

[franklin2]

If your output shaft doesn't have much play, you probably don't need the bearing, you need the bushing in the tailshaft. The bushing rides against the smooth surface of the driveshaft yoke, and supports it. If it's worn badly, you will notice your seal continually leaks, and you may notice a vibration in the truck during part throttle. The vibration will go away pushing on the throttle or letting up on the throttle, but that inbetween light throttle position when the truck is almost carrying itself down the road is when you will feel it.

 

[GasFree]

If your output shaft doesn't have much play, you probably don't need the bearing, you need the bushing in the tailshaft. The bushing rides against the smooth surface of the driveshaft yoke, and supports it. If it's worn badly, you will notice your seal continually leaks, and you may notice a vibration in the truck during part throttle. The vibration will go away pushing on the throttle or letting up on the throttle, but that inbetween light throttle position when the truck is almost carrying itself down the road is when you will feel it.

Hmmm, is that part of the flange? I don't see a bushing in the blow up but what you say make sense. There is usually a drop of atf hanging off the flange but I assumed it was blow back from the case leak.

 

[forcefed]

If there is a bushing in the tailshaft I need one too, because mine is always leaking tranny fluid there. Just help keep the rust away I thought.

 

[franklin2]

I believe it's #45 in the drawing in this link.

http://www.drivetrain.com/parts_cat...lacements_and_parts/bw1356.html#Illsustration

 

[GasFree]

I believe it's #45 in the drawing in this link.

http://www.drivetrain.com/parts_cat...lacements_and_parts/bw1356.html#Illsustration

Interesting, my shop manual doesn't show it but it looks like the yolk to flange seal could also be considered a bushing given how its constructed.

 

[typ4]

gasfree, is yours a slip yoke or a bolt on? They are 2 completely different scenarios.
The slip yokes wear the bushing and make the leak. The bolt on yokes seldom have problems.

 

[GasFree]

gasfree, is yours a slip yoke or a bolt on? They are 2 completely different scenarios.
The slip yokes wear the bushing and make the leak. The bolt on yokes seldom have problems.

Thanks Russ, didn't know there was a difference on the same trucks. It's the slip on type. The output shaft is solid so I'll see if the seal is the remedy. It's the same BW1356 Franklin showed but that part (45) is not showing on my diagram. BTW, if things go according the new and revised plan I'm swapping out my G injectors for the BB's you sent in a few days so I'll pm you about shipping you the G's to be checked.