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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!
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| | | | Joined: Oct 2014 Posts: 140 'Bolter | | 'Bolter Joined: Oct 2014 Posts: 140 | Has anyone ever used a larger diameter with a smaller diameter shaft on a two piece driveline ? Does it matter if they are not the same? I'm working on a 3800.
Last edited by John L.; 03/09/2022 12:30 PM.
| | | | | Joined: May 2015 Posts: 11,004 Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums | | Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums Joined: May 2015 Posts: 11,004 | I don't believe the shaft diameters being different would cause any problems. The larger diameter would be a little more resistant to twisting (able to handle more torque), but that's about it.
Kevin 1951 Chevy 3100 work truckFollow this saga in Project JournalPhotos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together. | | | | | Joined: Feb 2016 Posts: 1,982 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,982 | As long as you can keep the U-joints in phase and have a splined slip joint in the rear one you should be fine.
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: Feb 2016 Posts: 148 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 148 | I recently purchased a three piece driveshaft that has 3" diameter tubing on the first two sections, and 3.5" diameter for the farthest rear section. The first two sections are fairly short, but the last and larger diameter section is twice as long. I'm guessing the larger diameter on the longer section makes it stiffer to help with whipping under higher rpms.
-David
1953 2-Ton GMC
I'm a machinist... because engineers need heroes too.
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