XtremeVette

I was wondering....if the main driveshaft can be removed and then replaced and end up being out of balance? My tranny was rebuilt and ever since then when I am hard excellerating I feel sorta a vibration going through a certain RPM band.....once out of that band range it goes away. Again....vibration is felt in or around 2000-3500 then goes away....and its not a horrible vibration, just enough to be noticed.

thanks
jeff

Brimis

It could be possible, one way for it to be out of balance is if one of the weights, if it had weights were knocked off the driveshaft during the removal/installation of the driveshaft itself.
I'm sure a more seasoned member can chime in.

fsr402

if it was out the vibration would get worst with the rpm

VTESPEED

driveshafts dont rely on rpm to be worse/better...

It would be speed dependant...

Also often vibrations like that will come in and out at increased speeds...like 55-60, 85-90 etc...where the vibration will be multiplicative...

LT4BUD

[QUOTE=XtremeVettem hard excellerating I feel sorta a vibration going through a certain RPM band.....once out of that band range it goes away. Again....vibration is felt in or around 2000-3500 then goes away....[/QUOTE]

The driveshaft speed is a function of vehicle mph, not rpm.....

Do you get the vibration in only one gear or do you get it in 1st, 2nd, 3rd, & 4th.

If it is at the same motor rpm, but at different speed in different gears then I would say most likely it is NOT the drive shaft.....

So I agree with VTESPEED

Must be something tied to engine speed....flywheel, clutch, ???

vettefast

When I had my 383 put in they had to send out my drive shift to be balanced because it was hitting against my transmission. It was a a one day service for $169.

SLOWRIDE

Any drive shaft could become unbalanced. Could be other things like clutch etc, Good Luck on findig it.

Trog

Also the drive shaft is marked at the rear yolk to go in one way. they may have not put it back right. A yellow Dot on one rear end yolk & black line on the drive line supposed to be 180 opposite. Helms manual covers this & also how to fix if it is still out of balance with (get this) a couple of hose clamps! I would crap if I saw that kind of back yard fix under my car from a dealer!!

rons85

I agree with what is said above - and would add this: Several things can cause a felt vibration (or resonance) at certain RPM points, but the driveshaft is not one of them. Accessory drives, exhaust, etc can all do it (try taking the belt off and running it up by hand while the car is parked - you can probably tell the difference by "feel"). If the problem started after R&R of the transmission I would suspect the Torque converter balance as most likely... You should be able to feel it by running the RPM up with the car sitting still.

As, yes, the center driveshaft has a factory marked "clock" position - at BOTH ends. If it wasn't put back in where is was supposed to be (and locating the front is a pain) there is probably a driveline, speed sensitive, vibration due to That.