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Re: Aluminum Driveshaft, who is the best for the $$$???
[Re: MR_P_BODY]
#2203233
11/27/16 11:29 AM
11/27/16 11:29 AM
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Joined: Sep 2003
Posts: 19,609
north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,609
north of coder
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Yes they have steep gears but also have BIG tires for the loads... they dont turn that many rpms and it seems that trucks shops dont care if there is a bit of vibration since they have a lot of vibrations  and this is precisely the issue i have dealt with locally. there are no truck shops HERE that can, or will, high speed balance. if a quality shaft is desired, we have no choice except to order one from a reputable outfit. others have access to truck places that are very good, so that is a plus to them. here, we don't. the truck place that has the best reputation only "high speed balances" to 1000rpm, and swears .030 runout is acceptable. ok for most i guess, but not me. 
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Re: Aluminum Driveshaft, who is the best for the $$$???
[Re: 1964superstock]
#2203266
11/27/16 01:04 PM
11/27/16 01:04 PM
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Joined: Oct 2007
Posts: 4,211
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,211
New York
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.030" would make me nervous.
Boffin Emeritus
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Re: Aluminum Driveshaft, who is the best for the $$$???
[Re: MR_P_BODY]
#2203345
11/27/16 03:20 PM
11/27/16 03:20 PM
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Joined: Oct 2008
Posts: 506
Utah, USA
1964superstock
OP
mopar
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OP
mopar
Joined: Oct 2008
Posts: 506
Utah, USA
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Myself I would go with steel on the street.. I called Dynotech to see what I should go with.. they said DOM so I did with good U-joints and yokes Speaking of Dynotech, I have called them over and over this month trying to contact them about my driveshaft, and no one answers the phone, goes to voicemail every time. I have left messages and sent emails, and no reply in over a month now. Seriously wondering if they are no longer in business?
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Re: Aluminum Driveshaft, who is the best for the $$$???
[Re: 1964superstock]
#2203351
11/27/16 03:26 PM
11/27/16 03:26 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Myself I would go with steel on the street.. I called Dynotech to see what I should go with.. they said DOM so I did with good U-joints and yokes Speaking of Dynotech, I have called them over and over this month trying to contact them about my driveshaft, and no one answers the phone, goes to voicemail every time. I have left messages and sent emails, and no reply in over a month now. Seriously wondering if they are no longer in business? Its been about 2 years since I was over there.. they had a lot of business at that time.. cant say why they dont answer but if they closed the phone wouldnt go to voice mail
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Re: Aluminum Driveshaft, who is the best for the $$$???
[Re: Monte_Smith]
#2203657
11/28/16 12:35 AM
11/28/16 12:35 AM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Aluminum is strong enough for most any application, hardly costs any more and is lighter...........easy choice for me If you're limited to a 3" driveshaft, is there still a weight advantage over CM steel? I'd expect the wall thickness would need to be stepped up over a 3.5".
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Re: Aluminum Driveshaft, who is the best for the $$$???
[Re: 1964superstock]
#2267375
03/11/17 01:47 PM
03/11/17 01:47 PM
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Joined: Oct 2007
Posts: 4,211
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,211
New York
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MW has great tech info on site WRT length vs. RPM etc.
Boffin Emeritus
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Re: Aluminum Driveshaft, who is the best for the $$$???
[Re: A727Tflite]
#2267393
03/11/17 02:02 PM
03/11/17 02:02 PM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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From the above post -
"Yep... I had a well known company make a shaft
for me and it turned out to be junk.. was .040
out of true and the balance was way off.. cost
me another $350 to get another from another
company.. now all I use is Dynotech.. they are
local so I can pick it up the next day.. you
wouldnt think .040 is much but it is"
Check a late model Dodge service manual - for a truck prop shaft - .010" is max at the weld ends and .015" in the center. That's for a truck running down the road - 2000 - 3000 rpm.
Now spin that prop shaft at engine speed down the track - 6500 and above.
Yep, just went through this and mine was .008-.010 out and at 6000 r's and above it was a rattlin scary ride and now is glass smooth past 7000 where I lifted. Balanced and straight make a HUGH difference whatever the material...........Mine is a 3 1/2" CM piece FWIW and was balanced to 3200+ rpm's......... 
Last edited by Thumperdart; 03/11/17 02:34 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Aluminum Driveshaft, who is the best for the $$$???
[Re: 1964superstock]
#2267594
03/11/17 07:30 PM
03/11/17 07:30 PM
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Joined: Oct 2007
Posts: 4,211
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,211
New York
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Remember that driveshaft speed tracks your rear axle ratio, not high gear ratio - overdrive doesn't slow the driveshaft down.
Boffin Emeritus
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