driveshaft reinstall question
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Senior User
Joined: Sep 2009
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From: Colorado
driveshaft reinstall question
So i found out that the u joints in my rear driveshaft were shot and i bought new ones with grease fittings, but when i dropped the shaft and brought it to the machine shop to have the joints pressed out, there was a problem. The whole knuckle had to be cut off, replaced, rewelded, rebalanced, and for fun they cleaned the whole thing up. There's one issue though... there's no marking where i marked the line up in my truck. They cleaned it off. Can i just put it back in any old way? Also, when i first started working on it, there was a painted yellow match up mark on the shaft and the flanges that weren't matched up. Are those factory?? I'm curious whether the last owner didn't match it up and the vibration put my u joints out of commission early.
Cargo Master
Joined: Jun 2008
Posts: 2,752
Likes: 5
From: Stillwater, OK
two piece or one piece?
on both, the driveshaft can be connected to the transmission any way the shaft will fit. I'm not sure if you have a yoke to bolt up to, or if it's splines to engage...
On a two piece, there should be a master spline between the two shafts that ensure that the U-Joints are aligned properly. There will only be a certain way to connect the two shafts, so you can't mess it up. If there is no master spline, make sure that the U-joints are in the same orientation on both shafts.
Driveshafts are normally marked just to make it easier to align both the transmission and rear-end sides at the same time...
on both, the driveshaft can be connected to the transmission any way the shaft will fit. I'm not sure if you have a yoke to bolt up to, or if it's splines to engage...
On a two piece, there should be a master spline between the two shafts that ensure that the U-Joints are aligned properly. There will only be a certain way to connect the two shafts, so you can't mess it up. If there is no master spline, make sure that the U-joints are in the same orientation on both shafts.
Driveshafts are normally marked just to make it easier to align both the transmission and rear-end sides at the same time...
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76shortie
1973 - 1979 F-100 & Larger F-Series Trucks
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Nov 20, 2010 11:53 PM
