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#1502542 Sun May 28 2023 09:26 AM
Joined: Nov 2021
Posts: 893
Any reason I shouldn't have the original shaft shortened vs going new? New engine has over 400 hp and 400 tq where it will be living in the rpm range

Last edited by Ferris Bueller; Sun May 28 2023 09:27 AM.

1966 C-10 Step Side
A Project Journal
Ferris Bueller #1502549 Sun May 28 2023 11:59 AM
Joined: Jul 2019
Posts: 578
Is it a 1 piece shaft? I would bring it to a driveshaft shop and just ask them.they are usually very helpful and wont just sell you on something you dont need. Some shafts have joints that are bigger than necessary stock and some are outdated and tiny.

Ferris Bueller #1502557 Sun May 28 2023 12:25 PM
Joined: Nov 2021
Posts: 893
Yes. Single piece.

1966 C-10 Step Side
A Project Journal
Ferris Bueller #1502560 Sun May 28 2023 12:41 PM
Joined: Mar 2007
Posts: 2,326
Crusty Old Sarge
Generally speaking the overall diameter is determined by the length. Anything over about 57 inches will be a larger diameter. As barn find says a good shop won't steer you wrong.

"Living life in the SLOW lane"
Come, Bleed or Blister something has got to give!!!
'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)
'58 Viking 4400, 235, 4 Speed (Thor)
Ferris Bueller #1502686 Mon May 29 2023 09:30 AM
Joined: Feb 2023
Posts: 100
RLB Offline
I had my '66 one piece shortened. Installed a new front yoke & u-joints. I'm comfortable with it, but ,of course, time will tell. It's not like we'll be drag racing these trucks.
My mild 454 probably has about the same torque as your 383 but less HP.

1966 C-10 Short Stepside
Step-by-step ~ and on-going resto build
in the Project Journals
Ferris Bueller #1502687 Mon May 29 2023 10:11 AM
Joined: Nov 2021
Posts: 893
Pulled my measurements. 53 5/16 center of yoke to yoke.

Looks like the joints will be different front to rear. Shop said to measure with yokes at their bottom and they will subtract as needed.

1966 C-10 Step Side
A Project Journal
Ferris Bueller #1502763 Mon May 29 2023 10:40 PM
Joined: Jan 2019
Posts: 1,369
Herder of Cats, Goats, and Sheep (moderator)
Front/rear u-joints being different is pretty typical. I ended up getting a conversion joint on my last custom job. One side of the cross was completely different from the other side.

I did that to get a larger tube and use the GMT800 front yoke on it while not having to change the rear axles.

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1958 Apache, long bed Fleetside, V8 w/SM420
Driveable but the rear axle needs work.

1959 Apache, long bed Fleetside that has been in the family for 25 years but in desperate need of love.
Ferris Bueller #1502824 Tue May 30 2023 02:15 PM
Joined: Dec 2018
Posts: 2,586
Ferris Bueller I,ve made about a pickup load of driveshafts in 60 years,mine,friends,customers,always used shafts mostly shortened not many on high horsepower applications. Didn't balance much,if it's straight it is balanced,gotta be in phase. Learned to use an Allemite strobe light wheel balancer for fine tuning on high rpm drive shafts.

Ferris Bueller #1502854 Tue May 30 2023 05:24 PM
Joined: Nov 2021
Posts: 893
Driveshaft ended up being bigger than I remembered when I dug it out. I have no question about it handling the HP and TQ.

1966 C-10 Step Side
A Project Journal
Ferris Bueller #1502909 Wed May 31 2023 12:37 AM
Joined: Mar 2019
Posts: 1,573
Take your driveshaft to the shop and see what they say. They may shorten it? But..... I took a drive shaft to Driveline Service here in Pgh Pa not to long ago, to have it shortened, but wasn't going to be cheaper in the long run. For $200 bucs, they made a new one to my length,with different u-joints, and attached my yoke to the front 1. Balanced, painted black, and picked up the same day. What more could you ask for? The application was a T5 behind a 8BA to a 47 banjo rear end. But that shouldn't matter. Find the shop, go in person to talk to someone like people are supposed to, and you might actually get what exactly you want. Not to mention, a better deal than you think. Good luck 👍

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