Re: Drive Shaft Requirements
[Re: JACK1440]
#2338341
07/17/17 01:33 PM
07/17/17 01:33 PM
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Joined: Jan 2003
Posts: 13,345
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,345
Marion, South Carolina [><]
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I bent/twisted 2 stock shafts running mid 10s at 3700 lbs. You definitely need a good one at your level. I'm currently running a 3" dia. steel "thickwall" shaft made by my local HD truck shop. So far it's help up running 8.90s at 3900 lbs., but I honestly wouldn't be surprised if it failed on me. Everyone else at these speeds is running 3.5" dia. shafts.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Drive Shaft Requirements
[Re: JACK1440]
#2338490
07/17/17 05:38 PM
07/17/17 05:38 PM
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Joined: Oct 2007
Posts: 4,205
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,205
New York
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3.5" is much better than a simple comparison of diameters suggests.
With the same wall thickness (I used 1/8" for this test) 3.5" is 62% stiffer than 3.0", and only weighs 17% more.
Boffin Emeritus
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Re: Drive Shaft Requirements
[Re: JACK1440]
#2338498
07/17/17 06:00 PM
07/17/17 06:00 PM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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You are past due for a better than OE drive shaft.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Drive Shaft Requirements
[Re: JACK1440]
#2338537
07/17/17 07:04 PM
07/17/17 07:04 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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14+ years on the same 3 1/2" chrome moly shaft and just had new 1350 spicer u-joints installed and a re-balance..........over kill maybe.......... 
Last edited by Thumperdart; 07/17/17 07:04 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Drive Shaft Requirements
[Re: JACK1440]
#2338563
07/17/17 07:40 PM
07/17/17 07:40 PM
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Joined: Aug 2003
Posts: 43,088
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,088
Bend,OR USA
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How long is the shaft and how many RPM? My Cuda has the motor moved way back and it has a Powerglide, the drive shaft is small diameter and short. The former owner had a Blown alcohol B1 motor in it with 5:57 gears and 16x33x15 inch slicks  Once I found out what ratio those gears actually where, I was told that it had either 5:13 or 5:38 in it, I swapped those gears out for a set of stock Dana Corp 4:56 gears  I think it crosses the finish line in the 1/4 mile now right at 7000 RPM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Drive Shaft Requirements
[Re: JACK1440]
#2339106
07/18/17 02:28 PM
07/18/17 02:28 PM
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Joined: Jan 2003
Posts: 19,352
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,352
Las Vegas
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I would agree with whats here for sure. IMO a 3" shaft will work fine but 3.5" aint gonna hurt. Also lots of material options out there. Most local shops can handle making something for your power level easy enough. If you want to aftermarket Mark Williams is the best IMO
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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