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BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Apr 2009 Posts: 171 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 171 | The rear half of the driveshaft in my 55 GMC 630 was removed when I acquired it, but came with it. I'm cleaning up and repacking the disassembled u-joint. The locking tab plates are marked "USE OIL". I'm accustomed to greasing u-joints, not oiling them. What am I missing?
1955 GMC 630, 1959 GMC W660, 1958 Chevy Spartan 80
| | | | | Joined: Feb 2016 Posts: 1,841 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,841 | Does the cross have a zerk? I would use high temp smooth grease regardless.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Apr 2009 Posts: 171 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 171 | Yes, it has a zerk. I plan to use good grease....I was really scratching my head about the oil notation.
1955 GMC 630, 1959 GMC W660, 1958 Chevy Spartan 80
| | | | | Joined: Apr 2009 Posts: 171 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 171 | FYI for anyone curious: I found in a vintage GMC maintenance manual that the "oil" which is specified is SAE 50. If I had to guess, I would say that, except for when it came from the factory, it has had grease pumped into the joints for every maintenance thereafter.
1955 GMC 630, 1959 GMC W660, 1958 Chevy Spartan 80
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