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#1 |
Truck Nut
![]() Join Date: Jun 2007
Location: Wills Point, Texas
Posts: 407
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2 or 1 Piece driveshaft why????
Why did GM use 1 piece and 2 piece driveshafts in long beds??? Is one stronger than the other? I never new why?
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Tony Kee Texas Square Bodies |
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#2 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: 2 or 1 Piece driveshaft why????
Its all about driveshaft length and critical mass. At a certain speed the driveshaft will vibrate. The speed lowers with the length of the shaft. Generally in a long bed your better off with a two piece that has a slip yoke in the rear shaft. it allows full suspension movement and will reduce the risk of bad stuff happening due to vibrations.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#3 |
Truck Nut
![]() Join Date: Jun 2007
Location: Wills Point, Texas
Posts: 407
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Re: 2 or 1 Piece driveshaft why????
I am just wondering why GM did a 1 or a 2 piece drive shaft on a long bed.
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Tony Kee Texas Square Bodies |
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#4 |
Account Suspended
![]() Join Date: Apr 2009
Location: lexington South Carolina
Posts: 2,124
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Re: 2 or 1 Piece driveshaft why????
i saw a short bed a the junk yard a few month ago that had a two peice
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#5 |
Garage wrench
Join Date: Feb 2008
Location: LaCrosse, WI
Posts: 1,855
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Re: 2 or 1 Piece driveshaft why????
I can confirm that. The frame for my project was from an 85 shortbed and it also had a two piece shaft, I also thought that was very odd.
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-Adam 90 V1500 GMC Suburban 350/700R4/NP241..... 01 Saturn SL1 stock DD..... |
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#6 |
78 Big10 454
![]() Join Date: Jul 2008
Location: Pismo Beach, CA
Posts: 838
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Re: 2 or 1 Piece driveshaft why????
My Big 10 SWB has a factory two-piece driveshaft.
Last edited by 78 Big10 454; 06-05-2010 at 01:48 AM. |
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#7 |
Gettin It One Pice At A Time
Join Date: Oct 2004
Location: everett, washington
Posts: 2,688
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Re: 2 or 1 Piece driveshaft why????
Their was a post not that long ago that Keith said why. I just can't think of it.
Edit, I did a search and didn't find what I was looking for. so maybe I was imagining things lol.
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RIP ELJAY ![]() ![]() Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby Last edited by 79gmcc15; 06-05-2010 at 05:04 AM. |
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#8 | |
Registered User
Join Date: May 2010
Location: Ironton, Ohio
Posts: 22
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Re: 2 or 1 Piece driveshaft why????
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#9 |
Truck Nut
![]() Join Date: Jun 2007
Location: Wills Point, Texas
Posts: 407
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Re: 2 or 1 Piece driveshaft why????
Thanks...I was just curious.
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Tony Kee Texas Square Bodies |
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#10 |
Registered User
Join Date: Sep 2005
Location: Sun City West, Az
Posts: 3,822
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Re: 2 or 1 Piece driveshaft why????
yup,when i first got mine.i thought it was kinda rare.not really that rare at all in a short box.mine was a diesel.it does cause poroblems when you lower them.you get some funky angles.
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#11 |
Registered User
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
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Re: 2 or 1 Piece driveshaft why????
I have a one piece in my long bed (the light duty trucks came with them) and at around 100+ MPH I get a pretty bad vibration, and i'm pretty sure it's the drive shaft whipping.
Now that it's due for some new u joints, I'm looking at having the original 2 piece shaft redone and balanced with new u joints and a carrier bearing. 2 short shafts are much stronger than 1 long shaft. I just used the 1 piece because I already had it, and it was freshly redone with new u joints and balanced so I thought I'd give it a try.
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1977 GMC Sierra Grande Last edited by Pyrotechnic; 06-05-2010 at 04:05 PM. |
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