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Mod | | | Forums66 Topics128,049 Posts1,055,741 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | Joined: Sep 2007 Posts: 46 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2007 Posts: 46 | I have started the swap of a 261 into my 39 ½ ton. After I bolted the bell housing on and slid the fly wheel in place I ran into trouble. I planned on using the fly wheel from the 39. The crank on the 39 did not have any line up studs on it, but the fly wheel had a hole for one. When I tried to put the 39 fly wheel on the 261 it has three line up studs on the crank. I'm not sure what to do, any ideas how to handle this? | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | I would like to know the answer to this one too. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | You will need to use a 1942-54 flywheel if you use a 6 volt starter, or a 1955-62 flywheel if you are using a 12 volt starter. These flywheels come with a number of clutch sizes, so pick one to match the clutch size you want.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | Will the splines on the newer clutch mate up with the 39 transmission? | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Chev used the same spline as far back as 1925.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | Thanks, that is interesting that it was the same for all those years. | | |
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