Driveshaft recomendations?

Just finished setting my engine back and installing new solid motor mounts, now I need to have a new driveshaft made! I've got 625 hp on motor and I am planning on throwing another 150 hp of nos at it from time to time. I was going to order a chrome moly shaft with 1350 u-joints, but I'm not sure what diameter shaft is needed? A 3" c/m shaft would be nice because it would be really light, but I'm thinking that a 3.5" c/m shaft might be more bulletproof! Also wondering if I should pop for a forged drive shaft yoke versus a cast one? I've also considered a 3.5" or 4" aluminum shaft, but have heard they can be pain. Any advice?
                                                                                                               GT

Call these guys. Know the cars weight, engine rpm desired to run , AT or stick, and they can tell you what you need. Depends on the application and length as far as what is the strongest.  I've used them for customers cars with no failure yet as well as my own stuff.


http://www.dynotechengineering.com/

"by TravisRice on Sun 16 Jun 2013 - 17:43
Call these guys. Know the cars weight, engine rpm desired to run , AT or stick, and they can tell you what you need. Depends on the application and length as far as what is the strongest.  I've used them for customers cars with no failure yet as well as my own stuff.
http://www.dynotechengineering.com/"



Travis, I actually talked to them on Friday, Randy Malik had recommended them. They wanted to make  either a 3.5" or 4" aluminum shaft for me. I think I'd rather have chromemoly.
                                                                      Gary

I am not a driveshaft expert by no means. As was explained to me EACH have thier own strength + and  - 's for thier application. Sounds like you already have your mind made up so why ask then?

I have a 200 dollar 3.5 ms shaft made by a local truck shop, that includes the weld on yokes and the 1350 joints.


Ive beat the hell out of it w no issues.

One thing have seen with working with aluminum for some years the aluminum it don't take much to make aluminum brake.On a drive shaft I have not ever messed with but I do know if aluminum gets a good scare it will brake if under a lot of pressure. With being said I don't care for a aluminum drive shaft if it was to get a deep scratch or ding it will most likely bust at that point if it was to let loose and broke.

We run CM driveshafts in everything now.  Had an aluminum one in the lsx all motor car but it is sold now.  I'm hearing great things about the carbon fiber clad aluminum shafts too.

Strange builds nice chromoly driveshafts .

A 3.5" c/m shaft from Mark Williams, Bickel, Strange (etc) would probably be more than enough. If money is no problem you could always get a carbon fiber shaft from PST.

Gary ... if what you really want is a chriome moly drivershaft instead of a race one then "Joint, Clutch & Gear Service, Inc." will make you whatever you want.
Their home is around Detroit however, they have a satellite outlet in Saginaw - 989 686-2924.

The diameter of the driveshaft will determine the wall thickness of the tubing - .060", .080" or .090".
A 4" thinner wall tube will withstand and deliver more torque through it than a small diameter .090" wall tube and probably lighter, also.

Gary,
what length C to C do you need?, I have a brand new Mark Williams bonded aluminum one... 3.5 " with 1350 joints 39" C to C  make you a smokin deal on it.