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#1 |
Registered User
![]() Join Date: Nov 2008
Location: East Peoria, IL
Posts: 149
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Why a 2 piece driveshaft?
Does anyone know why the 1967 - 1972 Chevrolet C10 had a 2 piece drive shaft? I am replacing mine with mixed results. Advanced Auto Parts shows one picture and has a different part in the box. Auto Zone doesn't have it and NAPA was more expensive. I'm waiting to see what O'Reilly has for me now. That made me wonder why it's 2 pieces. I've had other cars and trucks that had drive shafts that long and there was no center support bearing.
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#2 |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: Why a 2 piece driveshaft?
It's a general rule that if the driveshaft is more that 72" then it needs to be two piece or it won't balance right.
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68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#3 | |
Registered User
Join Date: Dec 2008
Location: Yay Area CA
Posts: 2,329
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Re: Why a 2 piece driveshaft?
As a drive line gets longer the critical speed goes down you can increase the critical speed by using a larger, thicker tube or both. Critical speed is the point where the drive-shafts rpm's match the frequency of the material and begins to bend off its centerline.
Good reading here>>> http://www2.dana.com/pdf/J3311-1-DSSP.pdf Ujoint listings here w/dimensions>>>http://www2.dana.com/pdf/K350-1-DSSP.pdf
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1965 GMC shortwide big window 1969 Chevy C20 long (for now) 2005 Silverado 2500HD Crew Cab Quote:
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#4 |
Registered User
Join Date: Sep 2010
Location: Los Angeles California
Posts: 352
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Re: Why a 2 piece driveshaft?
So there..
J.
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1972 Custom Deluxe Highlander C20 1971 Javelin SST New Project 1971 Demon 340 1969 SS El Camino 1968 SS RS 396 Camaro 1967 Barracuda Formula S 1965 140/4sp Corvair Monza Convertible Sorry, but I don't do Fords. |
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#5 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: Why a 2 piece driveshaft?
if u need a new drive shaft find a reptual shop and have it built
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#6 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Why a 2 piece driveshaft?
Could it be that the leaf-spring chassis had a one-piece and the coil-spring chassis had a two-piece? I'm just asking and have no clue. My '96 GMC has leafs and a one-piece. My '69 has coils and a 2-piece. As long as the u-joints are good and properly installed and the center bearing is also good and the rubber in it is good, what is the problem?
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#7 |
Registered User
Join Date: Jan 2010
Location: GREENEVILLE TENNESSEE
Posts: 1,310
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Re: Why a 2 piece driveshaft?
short or longbed 2-piece..they had those too..
If you need a shortbed driveshaft one piece to replace the 2 piece, you simply get a driveshaft out of a mid 80's 4door caprece...Its a bolt in..and easy to find.. |
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#8 |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: Why a 2 piece driveshaft?
My 68 GMC is leaf and it has a 2 pc shaft.
__________________
68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#9 | |
Registered User
Join Date: Jul 2010
Location: Spanish Fork, Utah
Posts: 209
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Re: Why a 2 piece driveshaft?
Quote:
And what is the length of it? do you know it off hand?
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Ben Its a 67 Chevy C10 now, and its short now too. Here is my 1967 Chevy C10 Shortened Build Blog http://boyescustoms.blogspot.com Here is my 1967 Chevy C10 Shortened Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=433535 Last edited by mr.chevy; 11-04-2010 at 09:28 PM. |
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#10 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Why a 2 piece driveshaft?
Quote:
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. ![]() |
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#11 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Why a 2 piece driveshaft?
Quote:
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. ![]() |
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#12 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Why a 2 piece driveshaft?
When I made my comment, I meant for it to say that I didn't know and was just making a comment. I have no proof. My SWB has a small block and a TH400, as well as a 2-piece driveshaft.
I can see why longer wheelbase vehicles have multiple section driveshafts, so the mystery has been the subject of this post.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#13 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Why a 2 piece driveshaft?
Quote:
Both my neighbor and I have short beds. Mine is 350 auto with coils = 2 piece. The short step manual trans w/ 1 piece.
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. ![]() |
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#14 | |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: Why a 2 piece driveshaft?
Quote:
__________________
68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#15 | |
Registered User
Join Date: Jan 2010
Location: GREENEVILLE TENNESSEE
Posts: 1,310
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Re: Why a 2 piece driveshaft?
Quote:
the later 86-up are 55 inches weld to weld When you get your truck back together,take your old one,slide it in the trans where the yoke normally rides,then just measure it..and go to the yard and pick one out. That way you know..I worked at a big yard years ago..and you found what worked.. |
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#16 |
Registered User
![]() Join Date: Nov 2008
Location: East Peoria, IL
Posts: 149
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Re: Why a 2 piece driveshaft?
Mine is a short bed flare side with a 2 piece shaft. I had a 1976 Ford with a 8 foot bed and it had a one piece shaft. The length thing makes no sense. All of the older cars that were huge had one piece shafts with or without coil springs. Think of the old Buicks, Olds and Packards. My shaft is fine. I'm changed transmissions and now I'm replacing the u joints and center bearing. My last truck was a '68 long bed and sent from a 3 speed manual to a TH350 and we kept the same driveshaft.
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#17 |
Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: Why a 2 piece driveshaft?
They all came from the factory with a two piece driveshaft, long bed or short bed. If they have a one piece driveshaft, it's been converted.
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#18 |
Registered User
![]() Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,887
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Re: Why a 2 piece driveshaft?
to answer your question, I like my 2-piece because it doesn't have the same vibrations that every single 1-piece in my lowered trucks has.
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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#19 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: Why a 2 piece driveshaft?
The "critical speed" post is correct.
What you guys might be missing is that propshaft critical speed not just based on wheelbase but is also based on trans type (length), rear axle ratio, tire size, and engine type (larger engines allowing a higher top speed). So - a long wheelbase truck with a low (numerical) rear axle ratio spins the shaft slower and might get a one piece, but an otherwise comparable truck with a high rear axle ratio might get a two piece. One other comment - critical speed is not directly related to balance, but rigidity. When the shaft exceeds it's critical speed it begins to bow in the middle and swing like a jump rope. Hence the disturbance and durability concerns. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 11-05-2010 at 02:35 PM. |
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#20 |
Registered User
![]() Join Date: Nov 2008
Location: East Peoria, IL
Posts: 149
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Re: Why a 2 piece driveshaft?
I guess I'll accept that. It just seems odd that some longer vehicles have one piece and a shorter C10 has a two piece. Perhaps it's due to the diameter of the drive shaft itself.
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#21 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: Why a 2 piece driveshaft?
I've had two shortbeds, one 1972 250 6 cylinder with a turbo 350 all original, and a 1971 250 6 cylinder with a 3 speed manual, and both have had one piece driveshafts. There is not even anyplace for a carrier bearing to mount to on either one. There are holes in the crossmember that the trailing arms bolt to, but it doesn't look like there has ever been anything bolted or rivited to it.
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#22 |
Registered User
Join Date: Jan 2010
Location: Roanoke, Tx.
Posts: 1,561
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Re: Why a 2 piece driveshaft?
Have a drive shaft shop make a one piece. They will tell you how to measure it. Take the bracket that the carrier bearing bolts out of the truck.
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#23 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: Why a 2 piece driveshaft?
Quote:
In the GMT400 and GMT800 versions we started using "exotic" materials like aluminum and carbon fibre wraps in larger diameter shafts - all with the motivation of taking some of those two piece applications and turning them into one piece (saving the additional center bearing hardware and complexity). Believe me, the engineers wanted one piece shafts wherever they could get away with it, too. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 11-05-2010 at 12:29 PM. |
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#24 | |
Account Suspended
Join Date: Sep 2010
Location: hingham ma
Posts: 1,721
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Re: Why a 2 piece driveshaft?
Quote:
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#25 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Why a 2 piece driveshaft?
Actually, quite a few GM cars began using 2 piece shafts as far back as the late 50s. This wasn't done because of shaft length or loading, but rather to allow a lower floor hump or accommodate an X-frame. Other makes may have done this too, but I happen to be personally more familiar with GM.
Ray
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