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1999-2007 Upgrades and Aftermarket - General Upgrading or adding OEM or aftermarket equipment to your 1999-2007 Super Duty. Please confine discussion of topics in this forum to those items that are not engine-specific.

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Old 07-20-2007, 01:17 PM   #46 (permalink)
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Re: Carbon Fiber Driveshaft

What does the stock shaft weigh?
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Old 07-20-2007, 02:18 PM   #47 (permalink)
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Re: Carbon Fiber Driveshaft

[ QUOTE ]
What does the stock shaft weigh?

[/ QUOTE ]


Next week after it's installed, I'll have the weights, pictures, and dyno results.
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Old 07-20-2007, 10:47 PM   #48 (permalink)
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Re: Carbon Fiber Driveshaft

God, I used to make these back in '78 when I worked for Graftek (Exxon Enterprises).
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Old 07-20-2007, 11:15 PM   #49 (permalink)
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Re: Carbon Fiber Driveshaft

What were they used for? Were they an improvement over what they replaced. How close were the there balanced tolerances?

I found out that ACPT's has there driveshaft balanced to 1/25 of an once.
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Old 07-27-2007, 11:58 AM   #50 (permalink)
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Re: Carbon Fiber Driveshaft

Got some pictures from Mark. I uploaded them to the photo gallery. The shaft weighs in at 32lbs. It uses a carbon fiber tube with steel spicer components on the ends. There is a steel tube inserted into the carbon tube approximately 6 inches which lets them weld the spicer XL components to them.

Here is a pic of the complete shaft:


Here is a pic of the shaft being weighed:


Proof of the 32lbs:


The shaft has a double cardan CV front with a grease jerk to keep it lubed, it is Spicer XL components (the strongest u-joints on the market). The u-joints are a forged cross design unlike the factory cast pieces:


Spicer XL U-joint at the pinion flange:


Greaseable slip yoke (can't grease the factory shaft without taking it apart):


Pinion Flange:


T-Case Flange:
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Old 07-29-2007, 02:39 AM   #51 (permalink)
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Re: Carbon Fiber Driveshaft

Any dyno numbers or seat of the pants differences to post yet?
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Old 07-29-2007, 06:21 PM   #52 (permalink)
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Re: Carbon Fiber Driveshaft


Haven't installed yet. There has been some technical difficulties.
Hoping to get resolved within couple weeks. Not ducking your question but I can't get dyno'd until it fits.
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Old 07-29-2007, 08:20 PM   #53 (permalink)
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Re: Carbon Fiber Driveshaft

$1000 and the sucker doesn't even fit!!! [img]/ubbthreads/images/graemlins/vomit.gif[/img]
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Old 07-29-2007, 08:45 PM   #54 (permalink)
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Re: Carbon Fiber Driveshaft

What kind of difficulties are you having.
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Old 07-29-2007, 10:03 PM   #55 (permalink)
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Re: Carbon Fiber Driveshaft

[ QUOTE ]
What were they used for? Were they an improvement over what they replaced. How close were the there balanced tolerances?

I found out that ACPT's has there driveshaft balanced to 1/25 of an once.

[/ QUOTE ]

Graftek was in the sporting goods business, making carbon fiber fishing poles, golf clubs, bikes, etc and started to get into other fields, including automotive.

That was the late 70's and with the gas crunch at that time, the auto industry was looking for ways to save money. We were R&Ding all types of parts - driveshafts, pushrods, swaybars, coil and leaf springs for cars, light trucks and tractor trailers. From all of that work at Graftek is where the use of carbon fiber leafs on Corvettes, CF driveshafts on production F-150s and E-150s, GM pickups, and a host of other items.

The Graftek approach to driveshafts was to use an aluminum tube for the torque and mounting of the yokes, and a covering of CF for stiffness. We were prototyping those for Ford, GM and Dana, including up to class 8 tractors. I think the tractor-trailer leaf spring pack weighted about 35 lbs vs hundreds.

No way would I remember the tolerance that the shafts were balanced to.
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Old 07-30-2007, 12:53 PM   #56 (permalink)
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Re: Carbon Fiber Driveshaft

[ QUOTE ]
[ QUOTE ]
CF rims anyone?

[/ QUOTE ]

I believe there are aftermarket companies advertising cf rims. Not sure if they are real CF but that would be crazy.
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Old 07-30-2007, 06:47 PM   #57 (permalink)
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Re: Carbon Fiber Driveshaft

Okay, It came in, tried to install, but the ends of the driveshaft on a 06 is not the same as an 04. Sent, it back last Friday and tomorrow going to take off the driveshaft and get the correct measurements they need to fix the problem. I should have done this in the first place. Tomorrow at least I'll know what the 2-piece driveshaft weighs.
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Old 07-31-2007, 12:10 PM   #58 (permalink)
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Re: Carbon Fiber Driveshaft

Just got done measuring and weighing. Should have back by next week.
The end piece that attaches to the rear end was wrong.
Did weigh it though - 50lbs. I'll be saving 18lbs = 64% less weight that stock
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Old 08-03-2007, 03:24 PM   #59 (permalink)
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Re: Carbon Fiber Driveshaft

Just got tracking number, It will re-arrive this coming Tuesday.

Next week, the mystery will be over. I'll have dyno numbers and

driving impressions.
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Old 08-07-2007, 04:05 PM   #60 (permalink)
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Re: Carbon Fiber Driveshaft

Finally, I've got her one. Now, can I feel the seat of pants difference" YES

I'm going to have it dyno'd later this week. I'm guessing that its going to be about 12-15 rwhp gain. The big difference was the way it shifted between
gears. When I floored it at 10 mph, I use to feel the shifts from 1st to 2nd to 3rd. The feeling of the shifts are gone?? Hope that made sense. But, now I just hear the motor shifting (no more jolts). It almost seems like the
the truck speed shifts from gear to gear. No more hesitations. It's a whole lot different than before. I like it, but I also liked being somewhat thrown back a little in the seat. Now, its more like a rocket, the shifts are quite unnoticeable. I'm know it's quicker. My Powershot 2000 propane system gave me about 24 rwhp - I don't think the carbon fiber driveshaft is going to give me 24 rwhp. - But, maybe 15rwhp. All I can say is that I'm happy that it's finally in and that if I had to go through this again I would.

Will be getting back with you later this week after the dyno

Doug, at go go diesel dot com has been a tremendous help to me.

I wanted to say God bless him, but God bless him.
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