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Drive shaft

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Post  69F100 April 11th 2014, 2:49 pm

I got to buy a new drive shaft for the Ranger Strange has a 3'' chromoly I am looking at my drive shaft will be 64'' from joint to joint. I am going to be leaving off trans brake some where around 4000 rpm engine should be making close 700hp truck is 3000# with me in it or should be close to that. Just wondering if the 3'' chromoly will be big enough at 64''.
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Post  D. Sea April 11th 2014, 3:11 pm

http://republicdiesel.com/

^ 3.5" Steel driveshaft with 1350 series U-Joints in my car

3200# and 825-ish HP
Leave off transbrake

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Post  maverick April 11th 2014, 5:16 pm

Even with 1350 joints I doubt the tube will be the weak link.
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Post  maverick April 11th 2014, 8:59 pm

I've destroyed two driveshafts while drag racing...both on big tire BBF powered cars. One because a u-joint failed, the other one because the pinion shaft was twisted off the pinion gear in the 9" rear. Neither was caused by a failed/twisted shaft tube.
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Post  69F100 April 11th 2014, 10:23 pm

I can get the 3" for $238 it comes with the spicer u joints if I order it Monday he said today the 64" is not one they make and keep in stock and I should get it in 2 weeks 3 at the latest.
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Post  Wes Littrell April 14th 2014, 9:17 pm

I would use mild steel. Ran a home built junkyard in the black truck for years without a problem. Used it in the woody truck, so I had a c/m made to replace it. Destroyed it in the burnout the second time out. I called inland empire driveline and they don't recommend c/m. He said everybody thinks it's better but it's not. Said it makes a good chassis but a poor driveshaft. It has to do with harmonics. Kinda like the lady that could sing and break a glass. At a certain length and diameter and rpm it will just fly to pieces. Said mild steel is a lot more forgiving. I went back to m/s and haven't had any problems.
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Post  69F100 April 14th 2014, 9:47 pm

I havent order one yet last 4 days I put in 50 hrs hadnt had time to do anything on it thanks for the tip on c/m I will just get a 3 1\2" mild steel for it
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