Shaftmasters drive shaft vibration

[DarkHelmet22]

I installed a shaftmasters DS on a buddy's car and set the pinion to -1. He gets driveline vibration at 110mph. Sound like a DS balance issue or pinion angle problem?

 

[D2M]

I just installed mine yesterday and same issue. Above 80mph it starts and all hell breaks loose above 100mph..

 

[Fabbed5.0]

Try flipping it 180, mine has no vibration

 

[D2M]

I will try. thanks.

 

[nosscort]

Always curious why flipping them makes the vibration go away ?

 

[D2M]

Just flipped it 180° and now the vibration has moved to 60-90mph it kinda smooths out above 90 but still slightly there. Definitely an improvement.

 

[debit_free_2010]

I installed a shaftmasters DS on a buddy's car and set the pinion to -1. He gets driveline vibration at 110mph. Sound like a DS balance issue or pinion angle problem?

I had massive vibration issues when I installed a Shaftmaster DS. All that vibration was caused from the rear U-joint not being square to the driveline.

Adjusting the pinion angle helped, but it mainly moved the vibration up or down a couple hundred rpms.

You need to get the engine/transmission/drive shaft and rear as straight as you can.

In my case, I could not get the u-joint squared up, it was always too closed up on the passenger side, Turned out my right side wheel base measured 106-7/8", drivers side was 107-3/8" likely caused by LCA relocation brackets being a little OOT.

I installed adjustable LCA's to set the wheel base to 107-1/8" on each side and was finally vibration free.

With hindsight I should've known something was off with the rear when I installed the relocation brackets as my steering wheel went off center to the drivers side, after setting the wheel base it went back to center.

 

[Serpent]

i heard you will need uca's to supplement the DS.

anyone know if thats all thats needed or are lca's needed too?

 

[SCalla1384]

There's a yellow mark on the ds you matchup to the pinion. I did that and have 0 vibration. Stock upper and mount

 

[nosscort]

Is there a mark on the pinion ?

 

[D2M]

I saw the marks. I matched them and still same vibration,.. I have now phased the drive shaft 3 times and still sames issue.

 

[Mikegee1028]

Mine doesnt vibrate I had mine installed by sam galloway ford overhere in florida, however i do get this very annoying clunking sound when i go over bumps =/, no idea whats causing that...

 

[ajpturbo]

There's a yellow mark on the ds you matchup to the pinion. I did that and have 0 vibration. Stock upper and mount

What does the pinion have to do with it?

They are not balanced as a pair.

 

[Fabbed5.0]

Just flipped it 180° and now the vibration has moved to 60-90mph it kinda smooths out above 90 but still slightly there. Definitely an improvement.

If your still having problems I would contact them and have them rebalance it or send you a new one.

 

[D2M]

If your still having problems I would contact them and have them rebalance it or send you a new one.

Yeah that's the next step..

 

[viperakron]

I clocked the OEM driveshaft to be sure the pinion and trans were in the same orientation. There was a yellow dot on the Shaftmasters that I matched to the pinion yellow dot. Mine is smooth?

 

[Famine]

Im going to have to check mine. I start hearing vibration at 40mph.

 

[Famine]

Can you elaborate on how you measured all of this?

I had massive vibration issues when I installed a Shaftmaster DS. All that vibration was caused from the rear U-joint not being square to the driveline.

Adjusting the pinion angle helped, but it mainly moved the vibration up or down a couple hundred rpms.

You need to get the engine/transmission/drive shaft and rear as straight as you can.

In my case, I could not get the u-joint squared up, it was always too closed up on the passenger side, Turned out my right side wheel base measured 106-7/8", drivers side was 107-3/8" likely caused by LCA relocation brackets being a little OOT.

I installed adjustable LCA's to set the wheel base to 107-1/8" on each side and was finally vibration free.

With hindsight I should've known something was off with the rear when I installed the relocation brackets as my steering wheel went off center to the drivers side, after setting the wheel base it went back to center.

 

[sur_real1]

Mine doesnt vibrate I had mine installed by sam galloway ford overhere in florida, however i do get this very annoying clunking sound when i go over bumps =/, no idea whats causing that...

Had a similar problem with clunking. For me, it was my bump stops. I shaved them quite a bit and the clunking went away.

 

[hand-filer]

What does the pinion have to do with it?
They are not balanced as a pair.

It's one of those urban myths that refuses to die.