2 Piece driveshaft "Phasing"
Senior User
Joined: Dec 2018
Posts: 243
Likes: 4
From: Elizabeth
I always use a paint pen or scribe the relative positions before removing a driveshaft, regardless of the number of pieces. I've never had a vibration or noise issue after reassembly.
That said the next ten people will comment they never do and don't have problems. Think "best practice".
That said the next ten people will comment they never do and don't have problems. Think "best practice".
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Anything that rotates has a certain amount of vibration, runout, axial play, all that stuff. It will last a lot longer if it is minimized. If you can actually hear it, or feel it, that just means its really bad.
Laughing Gas
Joined: Sep 2012
Posts: 860
Likes: 13
From: Asheville, NC
That photo shows larger truck, but the two piece driveshaft in smaller trucks is also phased. My rule of thumb has always been this - when I replace u-joints, I take the driveshaft to a driveshaft shop to have it balanced. They will mark the pieces in correct phase to ensure correct installation. I replaced the original 3 speed with a 5 speed Tremec OD about a year ago. The local shop charged $107.00 labor to shorten the front driveshaft, replace u-joints, replace carrier/hanger bearing, and balance the assembly. They clearly marked the pieces so I could assemble/phase the two pieces in the truck to maintain the configuration they used when the assembly was balanced. No vibration.
Fleet Mechanic
Joined: Jan 2014
Posts: 1,539
Likes: 282
From: Billings Montana
My short bed has a 1 piece shaft. When I put it back in during resto I wasn't really paying attention and got the slip joint off about 5 or 6 splines. Vibrated bad. redid it and no vibration
Logistics Pro
Joined: Mar 2005
Posts: 3,771
Likes: 80
From: tujunga, calif
Thats totally baffling to me. I have never seen where a one piece shaft has to be installed a certain way? Please explain how you determined it was 5-6 splines off?
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Fleet Mechanic
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From: Billings Montana
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Logistics Pro
Joined: Mar 2005
Posts: 3,771
Likes: 80
From: tujunga, calif
OK, I see, early morning brain fart. I was thinking of a drive shaft that has a slip yoke that just goes into the trans..
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