Thread: Vibration

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I bought a 1934 street rod. While driving I have a vibration. This is what I have done so far balanced drive shaft, changed flywheel, checked wheel bearings, checked rear, rblt trans,rblt engine. The only thing I have noticed is that they used old style motor mounts( the flat style with a donut rubber). They are bolted straight through with a bolt. The bolt is torque as tight has they could get it. It looks as though the rubber is doing nothing. The motor can't move. Should I loosen the bolts a little?Could this be causing the vibration? Thanks your help would be greatly appreciated.

Universal joint giving up?

No the u-joints are new also. Thanks

does it vibrate when you're sitting still, all the time, certain speeds, certain rpm range? need more info!

Check the angle of the motor & pinion. They should be the same i.e. motor 3 degree down & pinion 3 degree up. Also ckeck the fore & aft alignment of the motor/trans w/the the rear end.
Don

OK, I will check the degree of the motor and rear. If I can find someone with the tool. There is no vibration sitting still it seems to pick up from 45 mph up and around 65 it feels really bad. Not a wobble just a vibration like the rear is going as fast as it can. The car is taching about 2000-2100 at 60 mph. The rear is a Ford 8" with 3.00 marked on the tag. I figured I was getting the vibration from the mounts on the motor being bolted almost solid. I don't know it's driving me crazy. Thanks for all the ideas!! Might be one of them...

OH, and yes it vibrates when you step on the gas and not when you let off. Thanks

dont forget about the tires. they will bump around that speed.

Thanks, I will drop the shaft and replace both just to make sure. I did notice a little clunk in reverse sometimes.Thats a cheap fix. I'll double check the tire balance also. Hope it works. Thanks everyone!!

I would at least loosen up those mount bolts. But thats just me.

I think I will loosen the mount bolts a little also. Thanks!!

I want to really thank everyone for their responses. Found the problem. Just like you said. The new u-joints were bad. Just had them checked when I balanced the drive shaft and was told they were OK. Well, guess what someone goofed. Thanks very much!