Just looking for information on custom driveshafts.

there is a shop near me in MN called Pruven Force Clutch and Ujoint

they said that they can make me a custom alluminum driveshaft, but I would need to supply the tranny yoke and the flange for the rear end.

does this sound right?

 

yuh

 

that sounds like a good way to free up some more hp from the engine, I wonder how much that would give you

 

These guys made a custom shaft for my turbo swap: Driveshaftspecialist

All I had to do was give them the length, the number of teeth on the yoke, and the differential bolt circle diameter. They had it made and shipped within 4 hours.

Not sure if they do aluminum but worth a check.

I still don't understand why you would have to supply the yoke and flange.

HTH,

Scott

 

Well they're hardly likely to make them or buy them for you.. I don't see what's so hard to understand? All they do is take your yoke and flange and connect them with an alloy pipe.

It really won't make a lot of difference, the standard driveshaft doesn't weigh that much. I'd look at it if I needed a custom driveshaft made for a modified rear end/gearbox swap, but otherwise you'd be better spending the money porting the engine, or any number of other mods.

 

I kinda thought any good driveshaft shop would have these things on hand. But yea if they can remove them from the driveshaft for you it's no problem.

 

well, Ill probably give them the yoke, as its a TII peice and is probably strong, there also serviceable as far as I know.

the stock FB shafts are unservicable as far as I know, so Ill just have to measure the bolt circle a have them mod one.

 

you remember the drill,,,,, some years drive shafts are serviceable and some are not. if and when you supply the parts that you need to use and know those parts are correct the margin of error on a custom piece fabb'ed. is far less. ajc13b (steve brown) had a custom driveshaft made, pulling wheelies and nothing broke.

 

I picked up a serviceable driveshaft yesterday for my GLC project. It's precisely 10mm longer than optimal. I wonder if that will cause any problems.

 

In the case of a driveshaft the moment of inertia is so little (since the weight is near the centerline of the shaft), that I doubt you'll feel the performance difference.

An aluminum or composite driveshaft is a good idea for a different reason. FBs, with their single piece driveshafts and high engine RPMs are very sensitive to driveshaft balance. Most aftermarket shafts are not balanced well enough to work like an OEM driveshaft in FBs. The lighter the shaft, the less likely you are to have problems.

I had a custom driveshaft made for my Turbo II tranny swap (the shop had all the pieces), and it gave me terrible vibration at highway speeds. When they rebalanced it, the problem just shifted to a higher speed. I finally had a new driveshaft made by Cannon Engineering, which fixed the problem. Both of these units were steel 'cuz I was on a budget, but the Cannon rep mentioned that aluminum or composite would be better at avoiding vibrations.

 

supplying my own yoke, they quoted me on $300 for it.

 

Mine was like $260 shipped everything brand new and replaceable u-joints.

 

http://www.acpt.com/index.html

I have had them do two carbon fiber shafts for me they are a little expensive 600-800 ish but talk about reducing rotating mass hehe!