[mp3553]

Have a 2000 4x4 TRD SR5...
This truck has had vibrations since day one. Been through the following: balance, alignment, bench seat modification, service manager and now the district rep. For 2 years, I have been telling them that there is a problem and they really won't listen.
Told them of all known possible solutions (from this board) and still have vibrations. These vibrations are @ all speeds. These vibs are not from the front end and are felt in the floor board and seat.
The entire 2 years, I have tried to find the cause of these vibrations and fell onto a possible cause. While sitting in park or neutral, if I increase the rpm's gradually the truck will vibrate @ approx 1800-1900 rpm and then again @ 2100-2200 rpm. Once the rpm's are out of those ranges the truck doesn't vibrate! When my truck is crusing down the interstate 60 mph fall into the lower rpm range and 75mph fall into the upper range. If you are cruising around town you will notice that the truck spends a large amount of time in those two rpm ranges. Now, the question is what is causing vibs under those conditions.
FINALLY raised some eyebrows when the district rep and service manager went for a "test" drive. Drove around town, on interstate and @ different speeds. Was told it was a 4X4 and would be a rough ride. Told them that there is a difference of up/down movement vs side/side vibrations. Once we got back to the dealer... still wasn't getting anyplace and put into park/neutral and for once I feel Toyota realizes it does vibrate and not from the road/suspension.
Problem as to date isn't solved, district rep suggested the bench seat modification, knowing it was preformed in 2000 I agreed.
Dealer ordered parts, took truck in and was called stating that it was already installed! No joke....
Well, after speaking to service manager, he states he will contact district rep to see what other steps are next.
The saga continues....