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Jul 21st, 2025 | | | | Joined: Jul 2013 Posts: 159 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 159 | My 51 3100 has a '50 code torque tube that has no dowel in the front bushing, making it a "late" '50, right according to the searched threads by jorb, etc.
So which Okie is right, a 50 or a 51? The vendors make the break at the model year without the early or late designation....so are there other differences than the dowelling, like the OD for example?
I'd like to confirm by objective evidence, like measuring, rather than trial and error. | | | | | Joined: Mar 2002 Posts: 9,112 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,112 | In the parts book, there are some of the dimensions for the original bushings. You might get some clues from that. | | | | | Joined: Jul 2013 Posts: 159 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 159 | Thanks for the lead on that, I did some checking and got this:
The front bushing for the 41-50 is 1" long, the 51-54 is 1 3/16" long.
Easy to check- I slid a bent wire in by the shaft and caught the back edge of the bushing, then marked the depth and measured it - got the 1 3/16" bushing!
This means my '50 code torque tube has the '51+ bushing, so it's a late '50 year change to watch out for.
For what it's worth, the "Ask Jim" responder advised to use the incorrect '50 replacement based on the code only , even though there was no dowel pins. I plan on advising them of this when I order the '51 bushing | | | | | Joined: Aug 2012 Posts: 131 'Bolter | | 'Bolter Joined: Aug 2012 Posts: 131 | I tore down a 1951 torque tube and a 1949 torque tube and they were both 1" long.
The 1949 had a dowel and the 1950 did not have a dowel, but the dowel was tough to find.
I think I remember the rear bushing being longer but I dont remember the length. Are you sure you are comparing front bushings on both? | | | | | Joined: Aug 2012 Posts: 131 'Bolter | | 'Bolter Joined: Aug 2012 Posts: 131 | http://chevy.oldcarmanualproject.com/parts/1929_54/346.htmIt looks like the front bushing on both are 1" long see under "BUSHING, Propeller Shaft Housing (torque tube)" 4.451 Are you certain you do not have dowels?
Last edited by 1866yellowboy; 07/30/2015 4:33 AM.
| | | | | Joined: Jul 2013 Posts: 159 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 159 | Page 483 of the 1957 revision http://chevy.oldcarmanualproject.com/1929_57chevyparts/57cmpc0483.htmPretty clear there, front bushing is 1 3/16". And no dowels. This is a press fit bushing, only the slip fit must be dowelled. My guess is you could use either but I'd have to drill a hole for the dowel. Buyer beware of the different editions of the parts manual! | | |
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