CamaroZ28_LS1

iTrader: (5)

Found my issue of the sway bar causing the vibration, fixed.

STEEPSS

iTrader: (30)

Well, I think I found out what my vibration is today.

The driveshaft is out of round. .030 to be exact. SO I guess I'll be ordering one of those.

Driveshaft Shop

We have found the stock steel shaft have a harmonic set up from the shaft to the torque arm, you might want to consider a Aluminum shaft if you want to make sure its not going to have a vibration.

just my .02

STEEPSS

iTrader: (30)

Shaft is chrome moly. Thanks though.

Maybe quote me on a price for a stock length, 1350 U-joint shaft that will take some serious abuse? 600whp 6 speed?

Driveshaft Shop

To make a 3-1/2 1350 Aluminum shaft with

with a forged yoke it would be about 450.00
or with a Billet Strange yoke 500.00

STEEPSS

iTrader: (30)

****. i took the CM driveshaft out for measurements, just for kicks put in my stocker aluminium, and it still vibrates!!! the stocker never did before. Pinion angle is at 0*,

Maybe tailshaft bushing?

Driveshaft Shop

this may be the problem, you need to have equal angle at each. what happens is the top u-joint is moving back and forth and the bottom is not. they need to cancel each other out

STEEPSS

iTrader: (30)

So, to remedy this, I'd need to move my transmission mount down possibly? Like with washers?

That is one thing I haven't tried yet.

studderin

iTrader: (28)

ya.....

CamaroZ28_LS1

iTrader: (5)

an aluminum DS from Brute speed is $430 and the chromemolly is $450.

Bob@BruteSpeed

iTrader: (16)

Thanks! I sell the 3.5" PST 1000 HP aluminum driveshaft with a forged yoke for $430.00 shipped. Bob

studderin

iTrader: (28)

whats the weight on one of thouse bob? I just bought a moser billey yoke with the bolt on caps, for my steel DS, and looking to get somthing lighter.

Driveshaft Shop

don't just try things with out making the measurements, if you measure the 3 angles and either post them or call me ill tell you what to move and how far.
i believe the pinion angle is the issue (should not be Zero)

STEEPSS

iTrader: (30)

The pinion angle was only taken to 0* to determine if the driveshaft, or something else was the issue. I know it shouldn't be 0* more like -1 to -2*. When it's at -2*, the vibration is worse. I'll try to get to the shop and take some measurements (angles) tonight

STEEPSS

iTrader: (30)

Rubber mount and stock x-member though John. The truth is in the angles.........

STEEPSS

iTrader: (30)

Well I took some careful measurements just now. Car was level, suspension loaded.

I set the pinion angle to -1.5*, off the Pinion yoke

pinion yoke= -1.5*
Driveshaft= 0*
slip yoke = -1.5*

I'm truly at a loss now. Does anyone know what the tolerance for play (vertical) in the slip yoke is supposed to be?

Driveshaft Shop

The yoke will have a little play up and down, its bushing so when it gets hot it gets tighter as the parts heat up. your setting are text book correct. i would have to say at this point check the balance on the shaft.

STEEPSS

iTrader: (30)

I finally have an update.

After FIVE WEEKS of waiting, I got my PST aluminum driveshaft (nice piece but not worth the wait)

I install it, go drive it, no vibe at 50, none at 60, (grins) so i put my foot in it, and right about 90 mph it takes off and vibrates like a *****. About the only part of the equation that hasn't been checked thoroughly is the tailshaft (output shaft) bushing. I'm wondering if all that vibration that i was experiencing could have wallowed it out? Also, is it a huge PITA to do this repair in the car? I've only ever done it on a bench.

Bob@BruteSpeed

iTrader: (16)

Have you checked to see if you have a lot of play at the tailshaft bushing? Bob

Driveshaft Shop

If its good up until the MPH your asying i would look into other things, if a shaft it out of balance it will normally come on slowly and peak. it sounds like the vibration comes on strong in a certain situation. if its the bushing torque will change the severity of the vibration (playing with the gas pedal will make better or worse)







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