What would cause a carrier bearing to push out and tear itself up? Just installed new bearing, drove 15 mi and bearing has moved 2-3 inches towards rear and eaten itself alive. Will have to re-replace but am concerned that it's another issue causing prob and do not want a repeat. Don't understand what would cause the whole drive shaft to shift like that. Please help.
The front shaft should be mounted solid(by means of Ujoint) to tranny output, so not sure how the carrier bearing walked off the back? The shaft would have had to move forward? But how? There is no real "load" either way so it shouldn't want to move.
Did it go back in with a bind? Did you install the Ujoint first, then hang the bearing? Did the holes line up with mount?
That's what I'm confused about. I don't understand how it could move. Splined slip yoke up front on transfer case, joint u-bolted on rear diff to "cradle" yoke, lined up and bolted to bearing mount. No problem. 7 miles down road the rubber "boot/shroud" was beginning to melt. Got it back home and had separation of bearing and boot. It's possible the bearing was defective and seized AFTER installation but I just have difficulty believing it. It doesn't make sense and with the rapidity of the gross failure, I want to be sure nothing else could cause it to repeat. Don't have the time or desire to have to do it a third time. I'll try to post pics if anyone thinks they could help.
check all of your mounts , tranny and motor , and cross member bolts , and also check the transfer case to see if any thing slid back and pushed against the bearing ! check your rear end also and see if all the u-bolts are still tight and it did not move forward !
Dang!!! Only three things I can think of that would cause that,
(1) wrong bearing (as in center wrong size (allowed bearing to move))
(2) Bad trans and engine mounts (not likely but possible)
(3) defective bearing (locked up)
I don't have one out to inspect it but I did go out and look at mine, and checked my NAPA web site, and don't see any difference as in a front or rear to the bearing.
I know this is no help but maybe it will get it back to the top for sharper brains, and eyes to see it..
Where the slotted holes are that the bolts to the crossmember go to it looks like the bolts are all the way to one side of the slot. Did you have to force or pry on it to get the bolts in there? The only other thing I can think of is the bearing was not installed correctly. The couple carrier bearings I have replaced didnt look exactly like what I removed... cant remember exactly what was different. It is easy to damage one even for an expereienced mechanic.
Folks my f-350 SRW is on the third one since June of 2009. I chalk the first up to bad install. It failed in two months, the second lasted from aug '09 thru nov '11.
For some reason, I think my problem is made worse when I tow my fifth wheel. At first I thought that hitting dips and buckles were causing the trailer to squat the bed ( I do have air bags installed) and that squatting might cause more axial displacement. My line of thinking was that maybe lack of proper lubricant in the splines may have caused the shaft to move because of resistance in the splines.
I still do not know what is causing the problem, but after a 10 hour pull, I had a failure, and two years later another failure after a 12 hour pull.