[TNPro4x]

OK!!! Just came off the highway about an hour ago. At about 60mph it starts. At cruise during a 3 mile straight stretch of smooth highway, middle lane, I set cruise at 70mph. No vibration at all through steering wheel. Tracked starighter than any other car/truck I have ever owned. I was actually surprised how long it stayed between the lines with out any input... OK< heres the PROBLEM, as stated earlier by many others the rear end of the truck, the bed especially, starts vibrating. I can see the rear view mirrors start to vibrate too. Now during the vibration I tried a quick lane change and the trucks handles just fine however the vibration is still there to the point of seeing the bed vibrate in the vibrating mirors.. lol ( that just sounds funny). Anyways, I sped up to 80 and pfm vibration gone... Maybe just a slight residual but the faster I went the more it became stable up to 105mph then stretch over and slowed back down to 70mph where once again vibration came back. I tried a few more times back and forth on the same stretch of highway and did notice whenever engine is loaded( being tourqued) the vibration is more pronounced than when just coasting. Ok, so short of propping the truck up on jacks and taking it up to 70mph and posting the video on youtube and letting all the world watch my stupid act of destroying a 35k truck while it falls of the jacks and crashes into my house.... I have no idea on how to find out what is actually causing the vibration.

Now, I hate rancho shocks, bought them for an old CJ7 I had and realized they where junk an got rid of them. Hopefully the PRG performance setup will be a much needed improvement, BUT I have a gut feeling its not JUST the shocks and must bee something more causing this vibration. BUT then why at 100 is the truck really stable??? Hopefully somebody out there smarter than me can solve this problem.... Bueller< Bueller....