I have my 1UZ-FE in my car and was just about ready to go in for the roadworthy then i ran into this!
I changed the rear upper trailing arms on my car (VH Commodore) along with a couple of other bushes and the brakes, then when i put the car down and took it for a drive there was a huge vibration coming through to the cab. It is at its worse when i take off, then it gets softer as i get faster. Here is what i have done about it so far:
1.) took off the tail shaft and the centre rubber mount was split, so i got that fixed and the vibration was still there, but not as bad (which makes me think that the vibration caused the rubber mount to split in the first place).
2.) my old rear upper trailing arms were completely stuffed - very sloppy, so when i replaced them with new ones, perhaps the vibration was then able to be transferred to the cab (due to a more rigid joint). Because I never felt the vibration previously. So i went to the wreckers and got some old rear upper trailing arms and put them in thinking that might do something, but the vibration was still there.
3.) I thought i might be something weird like the exhaust flexing and causing the whole motor and gearbox to flex, which would put some sort of weid load on the tailshaft, but i took the exhaust off and it is still there.
4.) the vibration doesn't happen in reverse, which makes me think that it has something to do with the diff nose angle putting an axial load on the tailshaft or something, because when you take off, the back end of the car goes down and the diff nose points up. In reverse, the back end of the car goes up, and the diff nose points down.
5.) i jacked up the car from the diff, and put it in drive. The vibration wasn't there. I also loaded it up by holding on the brakes, but the vibration sill wasn't there. It is only when the car is on the ground!!
My next step is to take the tailshaft back in to get the uni's checked. I will also get it balanced, but it doesn't sound like a balancing problem to me, unbalanced tailshafts seem to go through a series of vibration (as the natural fequency's occur i suppose). This problem occurs at its worse when i take off or give it some! and is still present at higher speeds.
Any suggestions will be useful. Thanks.
Chris.
I changed the rear upper trailing arms on my car (VH Commodore) along with a couple of other bushes and the brakes, then when i put the car down and took it for a drive there was a huge vibration coming through to the cab. It is at its worse when i take off, then it gets softer as i get faster. Here is what i have done about it so far:
1.) took off the tail shaft and the centre rubber mount was split, so i got that fixed and the vibration was still there, but not as bad (which makes me think that the vibration caused the rubber mount to split in the first place).
2.) my old rear upper trailing arms were completely stuffed - very sloppy, so when i replaced them with new ones, perhaps the vibration was then able to be transferred to the cab (due to a more rigid joint). Because I never felt the vibration previously. So i went to the wreckers and got some old rear upper trailing arms and put them in thinking that might do something, but the vibration was still there.
3.) I thought i might be something weird like the exhaust flexing and causing the whole motor and gearbox to flex, which would put some sort of weid load on the tailshaft, but i took the exhaust off and it is still there.
4.) the vibration doesn't happen in reverse, which makes me think that it has something to do with the diff nose angle putting an axial load on the tailshaft or something, because when you take off, the back end of the car goes down and the diff nose points up. In reverse, the back end of the car goes up, and the diff nose points down.
5.) i jacked up the car from the diff, and put it in drive. The vibration wasn't there. I also loaded it up by holding on the brakes, but the vibration sill wasn't there. It is only when the car is on the ground!!
My next step is to take the tailshaft back in to get the uni's checked. I will also get it balanced, but it doesn't sound like a balancing problem to me, unbalanced tailshafts seem to go through a series of vibration (as the natural fequency's occur i suppose). This problem occurs at its worse when i take off or give it some! and is still present at higher speeds.
Any suggestions will be useful. Thanks.
Chris.