I am getting ready to order a driveshaft for my 80 swap. there is roughly a $20 difference between 3.5 and 4.0. The driveshaft i am looking at is steel with 1350 ujoints... Just wondering what yall think.

 

For $20... go BIG or go home IMO


You're welcome,
Mr. Flat Bill

 

I have a 3, and I think mine is rated at 2500hp or something ridiculous like that. I have mine balanced to 150 mph too.

 

What thickness is the wall?

mine is a stock 2 peice and its been spun up to 6200ish..

4700rpms in 4th with the converter locked ~157mph
wont ever do it again, but it was fun at the time.




Are you goin for TQ holding factor or top speed factor?

 

The site says .065 or .083

I am going for "no breakage factor".... basically the fastest it will ever go will be how ever fast i can go in the 1/4... So max 110-120mph....

 

ahh ok cool..
i just tell my guy double my HP and Speed i plan on goin.. when he gets thru laughing he tells me to come pick it up the next day.
i never ask questions, but ill call him in the morning and see what he thinks.
They build Driveshafts everyday for some crazy applications.

 

Cool. Thanks man

 

Mine is 3" .095 DOM steel. Second driveshaft with that material and no problems. If you're set on going with a larger diameter then you won't have any problems going with the thinner wall.

 

They do offer a 3.0 one. What is the real difference in sizes?

 

I had a 3.5'' steel shaft made. Love it, Works great, very strong.

I had asked a few members who have Forced induction what to use, i didnt want to spend 600$ on an alum shaft, IIRC it was Sharpshooter, Brent1976 and ( damn memory) but anyway these guys run a 3.5'' steel shaft with no problems, Russ' truck and mine are heavier than yours so i say 3.5'' as i have no experience with the 4''. Brent1976 has a reg. cab turbo and runs mid 11's .

BTW my shaft ( lol) was 273$ with an HD joint installed and my stock yoke, high speed balanced. Been up to 130++ , no vibrations.