Jack up the rear and spin the tires by hand, then do the front, simple way to see if the brakes or bearings are dragging. Generally, either of those issues will cause shuddering and noise at highway speed, but it never hurts to see what they feel like.
Transfer case engaged full time would be...
You might be able to find the bumper at a salvage yard. The wiring & switch location would be the issue for me(going through the firewall, etc). Is the factory switch with the 4th stop available somewhere?
Jeff
I did the timing set & oil pump on my 2000 4.6 last year. It was making quite a bit of noise at 170k. One of the plastic guides had worn through to metal, but it turned out the noise was mostly from the A/C clutch bearing. Glad to get it done though.
After cleaning & driving it a few cycles the leak was coming from the original problem location(front cover, valve cover, block)on the driver side. It was very little, but I couldn't let it go. I re-set the valve cover again with fresh puckey.
I opted for Moog lowers(new ball joint & original control arm) & Moog UCA assemblies. The lowers still look good after 8 years, but the rubber boots on the uppers didn't last beyond 5 years.
Managed to get the clutch assembly replaced the last couple of days. Like a knucklehead I fiddled around with removing the old pulley for a couple of hours before realizing it helps to remove the snap ring. It came off pretty easy after that, no puller required, just gentle persuasion with a...
The new clutch hub is working great, but the noise coming from the area is not going away. I went ahead & ordered a complete clutch assembly when I got the hub, but I was hoping the hub would solve my noise problem. Alas, it didn't. I was beginning to think the noise was the timing chain on that...
I can see now it's not the filter gasket, but the wire harness & oil cooler line are wet with oil(at least they are in the area around the PS pump & the filter adapter. I will try to get some brake cleaner in there this afternoon, maybe get the leak bracketed at least.
It seems the leak is still around after all. Not much, but there's a couple of small spots under the truck now & some oil collecting in the tray under the filter. If it's seeping from the same place at the cover I can't see it. I have a suspicion the leak is coming from the oil filter...
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