Driveshaft

RJ · 09-08-2008, 05:21 PM

I am needing about a 3.5" diameter 57.5" long driveshaft that needs to go about 6500 rpm. The driveshaft people I've talked to say that a shaft that long' going that fast will be over the critical speed. I see lots of station wagons racing out there that don't seem to have any problems, what is everybody using at about this length?

Thanks

69Cobra · 09-08-2008, 11:35 PM

http://www.dynotechengineering.com/

Pat Cook · 09-09-2008, 12:05 AM

RJ, I had the same problem with my "slug" until I put a Dynotech drive shaft in it, cured the problem.
When I had the rubber filled drive shaft it did not shake, after the "Canadian Transmission" was installed, it took 3 drive shafts until I talked to the guys at Dynotech and bought one of there shafts.

Run to Rund · 09-09-2008, 12:29 PM

4" diameter would be recommended for that length and speed. You can find a critical speed chart at www.markwilliams.com

09-08-2008, 05:21 PM	#1
RJ Member Join Date: Oct 2002 Posts: 248 Likes: 0 Liked 0 Times in 0 Posts	Driveshaft I am needing about a 3.5" diameter 57.5" long driveshaft that needs to go about 6500 rpm. The driveshaft people I've talked to say that a shaft that long' going that fast will be over the critical speed. I see lots of station wagons racing out there that don't seem to have any problems, what is everybody using at about this length? Thanks

09-08-2008, 11:35 PM	#2
69Cobra Senior Member Join Date: Aug 2007 Location: California, Ky Posts: 667 Likes: 33 Liked 1 Time in 1 Post	Re: Driveshaft http://www.dynotechengineering.com/ __________________ Kris Rachford 69 Cobra 428CJ 4 Speed C/S 3032

09-09-2008, 12:05 AM	#3
Pat Cook Member Join Date: Jun 2002 Posts: 175 Likes: 0 Liked 0 Times in 0 Posts	Re: Driveshaft RJ, I had the same problem with my "slug" until I put a Dynotech drive shaft in it, cured the problem. When I had the rubber filled drive shaft it did not shake, after the "Canadian Transmission" was installed, it took 3 drive shafts until I talked to the guys at Dynotech and bought one of there shafts. __________________ 67 Ford Fairlane F/SA 749 Last edited by Pat Cook; 09-09-2008 at 12:08 AM. Reason: cuz

09-09-2008, 12:29 PM	#4
Run to Rund Senior Member Join Date: Sep 2007 Location: Henderson, NV Posts: 578 Likes: 7 Liked 47 Times in 25 Posts	Re: Driveshaft 4" diameter would be recommended for that length and speed. You can find a critical speed chart at www.markwilliams.com