Unbalanced driveshaft
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
I agree. FWIW, the new vibration I felt at speed turns out to be a harmonic from the new engine that I'm not used to. I was planning to shift into neutral to see what happened, but as soon as I let off the gas pedal, the vibration stopped. I checked it several times, all the same. The new engine is bored .030 over and has a bigger cam. It just feels a little different at speed.
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Catch me up on the 180 degree off part? Only part to be worried about is if it's out of phase as in 90 degrees out. Most vehicles anymore have a master spline I'm the slip yoke to prevent any out of phase. Each shaft is separately balanced, 180 out still puts you in phase and each shaft being balanced there would be no issue. Is your carrier bearing spaced down to compensate for the lift? About a quarter inch for every inch of lift is a good rule of thumb. Did you use lift blocks? If so are they tapered or flat? They should be flat. Your t-case output and pinion flange angle should match to within a degree. From there the you space the carrier bearing until the rear shaft has about a degree more slope that the front section. Need a decent digital angle finder to do this.
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
It's been super hot here and his shop is not cooled. He's done this kind of work before, but it's not really what he's set up for. It takes a lot of trial and error to nail something like this and it's pretty hard to do when the heat index is 115. A drive line shop should be able to knock it out pretty fast.
Laughing Gas
Joined: Sep 2005
Posts: 984
Likes: 8
It's not trial and error at all. It requires some geometry that isn't any harder than high school level and a decent angle finder. Knowing how to apply it isn't always cut and dry but still not rocket science. If he's being paid to do it he needs to know what he's doing and not guessing. If he's not set up to do it he shouldn't be doing it. The correct geometry will put you dead on, rarely ever will fine tuning be needed.
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
It's not trial and error at all. It requires some geometry that isn't any harder than high school level and a decent angle finder. Knowing how to apply it isn't always cut and dry but still not rocket science. If he's being paid to do it he needs to know what he's doing and not guessing. If he's not set up to do it he shouldn't be doing it. The correct geometry will put you dead on, rarely ever will fine tuning be needed.
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