Front Spring Isolators UPDATE

[FoMoCo]

Hey all, last Saturday Sarah and I took a trip to Wright Patterson AFB. It's just over an hour trip by highway. We took the Truck because it was a nice sunny day and the new seat was finished the night before. I forgot how harsh this thing is on the highway. Cruising around town it's tight and smooth but over 55 mph it very rough. It's not an alignment or balance issue it's the frequency vibration from the road coming up through the truck. The radius, axel pivot, shocks, and front springs have been replaced. The king pins have 50,000 original miles. They feel tight but who knows. It has newr BFG long trail tires and recently aligned. It seems like there should be rubber between the spring and ibeam/chassis. Does any body have a cure. This truck is miserable on the highway around 65/70 mph.

Update:

Yester day I looked over the front end carefully and beleive I found the problem. Like most other 2WD's, mines leaning to the right passenger side. I recently replaced the from coils with new MOOG parts, as well as all the front rubber bushings. It was sitting near level and rode great. It only took it 6 month to droop back down. Anyways, the bad road noise and vibration was the tires getting chewd up from the positive chamber. The inner tire tread is at least 1/4 inch shorter than the outside tread. Maby I'll get lucky and find some rubber spring pillows that will correct the chamber too.

Nick

[fordman]

could it be the tire isn't s highway tire?

[averagef250]

I've found remnants of rubber between the spring and beam of every twin I beam truck I worked on. I cut donuts from heavy durometer 1/4" rubber matting and stuf in there. Not sure if anybody actually makes the replacement factory piece or not. Did you use poly or rubber bushings when you redid the suspension?

[FoMoCo]

I think I've seen energy suspension brand lift donuts. I could slice one down the middle. My 93 lightning had a hard white nylon shimy looking seat between the beam and spring. The rear shaskles have no rubber left in them.

Nick

[FoMoCo]

Updated