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| | | | Joined: Jul 2015 Posts: 203 'Bolter | | 'Bolter Joined: Jul 2015 Posts: 203 | I have a '53 GMC 1-ton. It had a SM420 behind a 235. The SM420 has a fixed yoke on the back, and the truck had a 2-pc driveshaft. The driveshaft had a slip-joint on the back shaft, next to the carrier bearing which also slides inside the bracket. So the driveshaft had "give" at the slip joint and the carrier bearing.. Now, fast forward to today. I just swapped out the old SM420 to a new T5, which has a slip yoke. So now my driveshaft has 3 "give" locations. The slip joint on the back shaft, the carrier bearing and the transmission yoke. When I drive it, the shaft is moving fore and aft and rubbing on the collar for the carrier bearing. I'm not sure what to do. Thinking out loud, I debated about drilling and pinning the back slip joint, but my fear is that it would then shove hard on the carrier bearing. Does anyone have any thoughts? I've never had a carrier bearing that slid inside its housing, so I'm wonding what would happen if I had it changed to a fixed carrier bearing?
1953 GMC 1-Ton Pickup with 350 and 700R4
| | | | | Joined: Feb 2004 Posts: 29,773 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,773 | The carrier should not move in its bracket. It sounds like you have a worn out carrier bearing holder, which should be replaced with one a little more rigid.
Jerry
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| | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | I agree.
However the carrier bearing is not usually asked to position the driveshaft or absorb thrust from braking or accelerating, this is the trouble. The front half of the shaft isn't anchored to anything except the bearing.
Is there any such thing as a "slip yoke eliminator kit" for a T5 transmission? | | | | | Joined: Jul 2015 Posts: 203 'Bolter | | 'Bolter Joined: Jul 2015 Posts: 203 | In looking at the GMC Service Manual, it looks like this carrier bearing is actually made to slide on the rubber cushion, which is a new one on me. I'm attaching a link which I hope works. Either way, the back shaft and the front shaft each have a slip joint, so if I get a new carrier bearing assembly that is fixed, it ought to do the trick. In this picture, its the top cut section, manual transmission... Driveshaft diagram
Last edited by Chad M; 07/17/2016 11:10 PM.
1953 GMC 1-Ton Pickup with 350 and 700R4
| | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | I've rebuilt one of those stock carrier bearings, the rubber is pressed in and not intended to slide or move after assembly or in use.
A modern replacement carrier bearing, new bracket and all, might be more secure, perhaps secure enough? | | | | | Joined: Jul 2015 Posts: 203 'Bolter | | 'Bolter Joined: Jul 2015 Posts: 203 | Sounds like thats the culprit. Back to the driveshaft shop!
1953 GMC 1-Ton Pickup with 350 and 700R4
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