Antarctica
Hot Rolled
- Joined
- Jan 16, 2007
- Location
- Annapolis, Maryland
OK - Followup to the u-joint thread.
This is a new to me 2002 F350 7.3 Crew Cab Dually, manual shift (6 Speed), 4x4, dana 80 rear. This has a truck camper on it that will live there full time. Has a slight vibration at between 60-66 MPH. Per the other thread, I replaced the driveshaft u-joints and carrier bearing thinking they could possibly (though I didn't think likely) could be causing it. They probably needed to be done anyway.
Some additional details on the vibration:
1 - Kicks in just under 60 MPH and goes to about 65.
2 - The vibration is very faint. You can't really hear it, but you can feel it in your feet/seat.
3 - Important one here.. It is periodic. It is on for about a second, and then off for about a second. On a few occasions, I think I felt it at twice the rate (i.e., on half second off half second).
4 - While the front tires have uneven tread wear due to no rotation, it is independent of road surface
5 - It is independent of whether the engine is loading or dragging. Usually, I find that rear pinion bearings change sound depending on whether the the engine is driving or dragging, so I don't think its the pinion bearing. That said, when I got the truck, the rear end was two quarts low on fluid, and I think the pinion seal is probably leaking (I need to check it again after adding gear oil).
I'm not sure how to isolate the cause at this point, other than keep driving it and let it fail. Its not a big deal, but I definitely think something is on the way out. Problem is, I have a camper on the back and its always going to be driven far from home and with the whole famn-damily onboard.
I'm looking for ideas on how to determine the cause/source.
As always thanks in advance.
Brent
PS - Yes, I know I could post this on a truck forum, but I trust the expertise on this site a whole lot more than a bunch of dudes extolling the virtues of 6 inch vs 8 inch vertical stacks and seafoam...
This is a new to me 2002 F350 7.3 Crew Cab Dually, manual shift (6 Speed), 4x4, dana 80 rear. This has a truck camper on it that will live there full time. Has a slight vibration at between 60-66 MPH. Per the other thread, I replaced the driveshaft u-joints and carrier bearing thinking they could possibly (though I didn't think likely) could be causing it. They probably needed to be done anyway.
Some additional details on the vibration:
1 - Kicks in just under 60 MPH and goes to about 65.
2 - The vibration is very faint. You can't really hear it, but you can feel it in your feet/seat.
3 - Important one here.. It is periodic. It is on for about a second, and then off for about a second. On a few occasions, I think I felt it at twice the rate (i.e., on half second off half second).
4 - While the front tires have uneven tread wear due to no rotation, it is independent of road surface
5 - It is independent of whether the engine is loading or dragging. Usually, I find that rear pinion bearings change sound depending on whether the the engine is driving or dragging, so I don't think its the pinion bearing. That said, when I got the truck, the rear end was two quarts low on fluid, and I think the pinion seal is probably leaking (I need to check it again after adding gear oil).
I'm not sure how to isolate the cause at this point, other than keep driving it and let it fail. Its not a big deal, but I definitely think something is on the way out. Problem is, I have a camper on the back and its always going to be driven far from home and with the whole famn-damily onboard.
I'm looking for ideas on how to determine the cause/source.
As always thanks in advance.
Brent
PS - Yes, I know I could post this on a truck forum, but I trust the expertise on this site a whole lot more than a bunch of dudes extolling the virtues of 6 inch vs 8 inch vertical stacks and seafoam...