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Jan 21st, 2020
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Joined: Nov 2021
Posts: 893
OP
'Bolter
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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.
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Joined: Jul 2019
Posts: 578
'Bolter
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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 Some shafts have joints that are bigger than necessary stock and some are outdated and tiny.
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Joined: Nov 2021
Posts: 893
OP
'Bolter
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Joined: Mar 2007
Posts: 2,326
Crusty Old Sarge
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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.
Craig
"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)
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Joined: Feb 2023
Posts: 100
'Bolter
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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.
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Joined: Nov 2021
Posts: 893
OP
'Bolter
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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.
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Joined: Jan 2019
Posts: 1,369
Herder of Cats, Goats, and Sheep (moderator)
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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.
From the Rocky Mountains?Check in with the RM Bolters!HiPo Forum Moderator1958 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.
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Joined: Dec 2018
Posts: 2,586
'Bolter
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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.
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Joined: Nov 2021
Posts: 893
OP
'Bolter
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Driveshaft ended up being bigger than I remembered when I dug it out. I have no question about it handling the HP and TQ.
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Joined: Mar 2019
Posts: 1,573
'Bolter
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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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