Blown motor / transmission mount? What do you think?
I have an odd but significant vibration occurring over 40 mph, mainly in 4th or 5th gear, but I can feel it in 3rd also.
It only happens when accelerating. I've had the truck up, spun everything to about 95 mph, listened to the transmission / motor / and rear end. I've deflected the driveshaft - doesn't look to be a U-joint. I've got a billion other things to do right now and short of going out and buying myself a good reliable Honda Civic, I'm pained to chase this problem for another 45 days or so... It was enough that I took it into my local independent driveline shop this AM. The shop thinks it's a motor mount that's being deflected during high torque. Looking at the mounts and torquing the motor (lock the brake, and put pressure on the driveline) - I get standard movement, nothing obvious. There isn't any way to put as much torque on them as when it's on the road... Basically has anyone blown a mount out of one of these trucks and have similar symptoms? This one is a new problem to me! |
I'd think that if it were a mount, the u-joints, output shaft or even rear pinion you'd feel some vibration in every gear.
Which makes me wonder if you've got a tire out of balance or out of round. Any odd rear tire wear? Have you tried rotating the tires? |
You don't say what kind of vehicle.
If 4WD you could remove the rear driveshaft and drive with the front end and see what that tells you. |
Sorry - 1988 4runner.
It's not wheels/tires - it just started this behavior on the way home one day... I could pull the rear DS.. It's definitely a "rear" of the vehicle deal though... |
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