Author Topic: Rear Differential Troubles PD4106-089  (Read 886 times)

Offline Branson S.

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  • 1961 GM PD 4106-089
Rear Differential Troubles PD4106-089
« on: August 05, 2017, 02:23:33 PM »
She's at W.W. Williams on Columbia, SC. First, we discovered a bad right-rear tire - then the wheel seal - then the bearings... All that was replaced and discovered a leaky rear end seal. After pulling it, here's what we found.



Shrapnel on the drain plug. I imagine this thing is grinding itself down and feeding the tainted oil to the bearings, right? So now the question is, rebuild? Replace? Put it back in and hope it lasts a while? I called Luke at US Coach and he's trying to find one. We can open it up to see how bad the damage is, but I wanted to ask you guys first. Thanks to Russ Long for his advice so far.

Offline Utahclaimjumper

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Re: Rear Differential Troubles PD4106-089
« Reply #1 on: August 05, 2017, 04:08:52 PM »
 Its not that hard to drop out the pumpkin and take a look,, it will answer many questions.>>>Dan
Utclmjmpr 
 EX 4106 (presently SOB)
Cedar City, Ut.
 72 VW Baja towed

Offline Zephod

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Re: Rear Differential Troubles PD4106-089
« Reply #2 on: August 05, 2017, 06:10:09 PM »
On Augusta Rd, West Columbia?


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Carpenter 3800 1994 on a Navistar 1994 chassis with a DT466 and alinson transmission.

Offline Branson S.

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Re: Rear Differential Troubles PD4106-089
« Reply #3 on: August 05, 2017, 07:06:06 PM »
Yes, Zephod, that's the one.

Offline chessie4905

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Re: Rear Differential Troubles PD4106-089
« Reply #4 on: August 05, 2017, 07:19:57 PM »
I'd pull it apart. It will need pinion and carrier bearings most likely, as that metal would have gone through everything. Good chance the ring and pinion will be ok. They are pretty beefy.Your coach should have 4:11 gear set, which is getting hard to find. Plenty of the 4:27 gears, as they were standard on 4905's. The 4:27's will lose you 4 to 5 mph top speed and help some in hill climbing and starting out.
GMC h8h 649#028 (4905)
Pennsylvania-central

Offline Zephod

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Re: Rear Differential Troubles PD4106-089
« Reply #5 on: August 05, 2017, 07:37:50 PM »
Yes, Zephod, that's the one.
That's about 18 miles from where I've parked my bus.


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Carpenter 3800 1994 on a Navistar 1994 chassis with a DT466 and alinson transmission.

Offline luvrbus

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Re: Rear Differential Troubles PD4106-089
« Reply #6 on: August 05, 2017, 08:28:22 PM »
Most of the time the pinion carrier bearings on the V drive turn loose, they can pull the pinion and bearing housing without removing the differential to check that for failure   
Life is short drink the good wine first

Offline OneLapper

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Re: Rear Differential Troubles PD4106-089
« Reply #7 on: August 06, 2017, 05:01:57 AM »
Any luck locating an axle?
OneLapper
1964 PD4106-2853
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Offline Branson S.

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Re: Rear Differential Troubles PD4106-089
« Reply #8 on: August 06, 2017, 09:31:07 AM »
I haven't been adamantly searching as of yet; waiting to hear from Luke at US Coach tomorrow. Once we know the full damage I'll be able to develop a plan.

Offline pvcces

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Re: Rear Differential Troubles PD4106-089
« Reply #9 on: August 15, 2017, 09:20:21 PM »
Branson, as far as I know, the 4106 only came with 4 1/8 ratio and the 4905 came with 4 3/8. Fast Fred said that he had a 4 3/8. He seemed to think it cost him about 1/2 mpg

Good luck finding what you need

Tom Caffrey.
Tom Caffrey PD4106-2576
Suncatcher
Ketchikan, Alaska