3" v 3.5" driveshaft...what are you guys running with 1K+HP?
#1947973
11/09/15 10:54 AM
11/09/15 10:54 AM
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Joined: Sep 2005
Posts: 620
Deep DEEP SOUTH
LAD 524
OP
mopar
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OP
mopar
Joined: Sep 2005
Posts: 620
Deep DEEP SOUTH
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Done a search but looking for specifics. Car is 3600lbs, street/strip, max 7-7200rpm, makes 800 hp / 770TQ N/A...may get sprayed with a 150-250 shot a bit later on. Looking to go with a 3.5" CM driveshaft based on the MW calculations and a bit of overkill on the strength. Shaft length is to be 42" c to c. Been thinking about Aluminum with my short overall shaft length - but not sure l have the room in a 4" OD shaft. Also, what would the 3.5" CM shaft be rated to HP/TQ wise in the 42" length ? Any thoughts / recommendations would be much appreciated ! Thanx ! 
Last edited by LAD 524; 11/10/15 05:20 AM.
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Re: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1948022
11/09/15 12:45 PM
11/09/15 12:45 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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I run a 3" diameter steel driveshaft made by a local driveshaft shop w/ 1350 joints. I told tem what it was going in and that I wanted something that would last. Not sure how thick it is or exactly what material....all they told me is that it is a "thickwall" tube. Been in the car since 2008.
8.95 at 149.7 mph at over 3900 lbs.
Not saying a 3.5" shaft isn't better, b/c I'm sure it's stronger. Just showing what I've done w/ what I have.
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: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1948098
11/09/15 03:34 PM
11/09/15 03:34 PM
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Joined: Jan 2003
Posts: 2,915
A shed in England
Tig
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master
Joined: Jan 2003
Posts: 2,915
A shed in England
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Custom 3.5 inch CM drive shaft here, it was a little lighter than our stocker.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1948143
11/09/15 04:37 PM
11/09/15 04:37 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
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I Live Here
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Posts: 19,317
State of confusion
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I went w/a 3 1/2" CM shaft based on a recommendation from Jason Pettis and the same one Douggie S. ran at that time and almost 14 years later, still kickin w/the same u-joints.......
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: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1948667
11/10/15 12:12 PM
11/10/15 12:12 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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Thanx fellas...
Chip Im surprised your running with a 3" DS at nearly 4K lbs and 1K+HP on the spray.
Thats a hell of a good Ds you have; is it chrome moly?
I have no idea, lol. Sheppard's Truck & Driveline Service in Florence, SC, made it for me.  It's one of those things that I had made in 2003 when the car was making about 600 hp and it's held up this long. That shaft got tweaked when the 727 exploded in 2008, so I had them make me another one just like it. No problems yet, but when/if it does break...I'll go bigger.
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: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1948680
11/10/15 12:31 PM
11/10/15 12:31 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Done a search but looking for specifics. Car is 3600lbs, street/strip, max 7-7200rpm, makes 800 hp / 770TQ N/A...may get sprayed with a 150-250 shot a bit later on. Looking to go with a 3.5" CM driveshaft based on the MW calculations and a bit of overkill on the strength. Shaft length is to be 42" c to c. Been thinking about Aluminum with my short overall shaft length - but not sure l have the room in a 4" OD shaft. Also, what would the 3.5" CM shaft be rated to HP/TQ wise in the 42" length ? Any thoughts / recommendations would be much appreciated ! Thanx ! The "Wallace racing" web sight has a nice calculator that can guide you in the right direction. Also check out "Denny's Driveshaft " web sight. Ton of good info. I went with a 3.5" DOM shaft. It's long (45") in a heavy car that makes around 650HP. Shift at 7K. 1350 joints. No problems.
Fastest 300
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Re: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1948745
11/10/15 02:45 PM
11/10/15 02:45 PM
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Joined: Jan 2003
Posts: 19,363
Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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FWIW HP is part of the equation but more importantly is the drive shaft length and the intended DS RPM. Those will be the determining factors in what material and diameter you need In the end call the companies that make them and give them these details and they will tell you what you need.
"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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Re: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1948976
11/10/15 07:54 PM
11/10/15 07:54 PM
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Joined: Sep 2005
Posts: 620
Deep DEEP SOUTH
LAD 524
OP
mopar
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OP
mopar
Joined: Sep 2005
Posts: 620
Deep DEEP SOUTH
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Hi Al...given the shorter length a 3" might work but may not allow for growth. I was surprised Chip runs a 3" DS. Having said that a 3" will work given my length and critical speed. But a 3.5" will allow for growth  I was kinda interested in what guys are running given their respective combos i.e."HP, TQ, weight, length and ,material. BTT
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Re: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1949009
11/10/15 09:05 PM
11/10/15 09:05 PM
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Joined: Nov 2003
Posts: 10,384
Upstate NY
Bigcube
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I Live Here
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Upstate NY
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Carbon fiber. 800ish HP 3000 lbs. Will be over 1000 HP if I ever turn on the bottle. I much prefer carbon fiber in case it ever breaks. The CF will just shatter and not beat the chassis to death.
Jim
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Re: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1949331
11/11/15 01:16 PM
11/11/15 01:16 PM
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Joined: Jan 2003
Posts: 19,363
Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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Once again it aint about power it about drive shaft speed, which is NOT engine RPM. I use MW stuff small 3.5" bonded aluminum shaft. Only omne time did I need more and that was with the 99 Hemi in the Cuda due to the length of the shaft and shaft RPM it required a carbon piece. Which I still have if anyone is looking for a smoking deal on one. Read here if you want some more info. http://markwilliams.com/driveshafttech.aspx
"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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Re: 3" v 3.5" driveshaft...what are you guys running with 1K+HP?
[Re: LAD 524]
#1949345
11/11/15 01:25 PM
11/11/15 01:25 PM
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Joined: Jan 2003
Posts: 19,363
Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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FWIW here is what critical driveshaft speed looks like. This is with a 4" aluminum shaft, not the vibration in the car down track. The aluminum shaft was fine with a 1050 hp motor due to downtrack driveshaft RPM. But with the 99 Hemi it was not so happy. https://www.youtube.com/watch?v=OBUuEGlJ5wwThis is with a carbon fiber shaft and no other changes https://www.youtube.com/watch?v=iBijNaRwePE
"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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