etcts-v

Busted my drive shaft over the weekend so now I'm looking for a replacement and wanted feedback. I plan on selling my car in the fall so I hate to throw too much cash into it, but also not willing to buy a new OEM one.

I'm thinking either the driveshaft shop 1 piece, one of the GeForce one pieces or GeForce 2 piece.

I know the 1 pieces are limited to 150mph which sucks ***, but I've never gone over 150 anyways so I'm leaning towards them as they are slightly cheaper. I'm also leaning towards the driveshaft shop simply because GeForce has a tendency to take forever and a month to ship their items.

Any thoughts or opinions on these 4?

http://www.driveshaftshop.com/2004-2...um-drive-shaft

http://www.shop.gforce1320.com/produ...&categoryId=61

http://www.shop.gforce1320.com/produ...&categoryId=61

http://www.shop.gforce1320.com/produ...&categoryId=61

NIKDSC5

iTrader: (10)

You say that now, then when you need to, or want to!

Driveshaft Shop

We also offer a carbon fiber one piece and we make 2 piece ones as well, just throwing that ut there. Either of those driveshaftsshould take 1-2 weeks to build.

Heres a pic of a two piece for all to check out
[IMG][/IMG]

etcts-v

Haha, exactly as soon as I'm told I can't go over 150, I'll push myself to go to 165! If I do go with the one piece I'm going to set my speed limiter to 148 as not to be tempted....

etcts-v

Good info, I missed your two piece setup. 2 weeks is reasonable, good to e aware of that up front as I tend up forget that these smaller market cars don't allow suppliers to just let inventory sit on the self waiting for my money!

Hmm decisions, decisions...

FuzzyLog1c

iTrader: (4)

Then pick up a 3.31 differential and up the limit to 169 mph. I've done 160+ mph in 5th and the car still has plenty of legs. If 54 and Gulf complete their 8.8 project, I'm almost certain that I'll be in the market for a carbon fiber driveshaft.

Driveshaft Shop

You know the 150mph limit is a round about number, if you were to give me your rear ratio and how tall the rear tires are we could get a exact number with a safe factor most are higher, were workingng with both a 8.8 and a 9" diff kit set that we have made CV adaptersrs for both ends, this will make the tube section much shorter and raise the Critical speed to a much higher number. keep and eye out for them soon. they will be similar to the 2009+ carbon we make in both the aluminum and 3.25 Carbon.

FuzzyLog1c

iTrader: (4)

OEM tire height is 26.70". OEM final drive ratio is 3.73.

Most popular 8.8" final drive ratio for this car is 3.55, but it's an expensive (and therefore rare) modification.

Driveshaft Shop

ok, i dont have the actual length of this shaft here at the house, ill check and give you the numbers in the morning. you know the carbon one would have a critical of about 220mph.

FuzzyLog1c

iTrader: (4)

This is your original announcement thread:

http://www.cadillacforums.com/forums...shaft-dss.html

Please note that we're still concerned about the heat from the exhaust getting to the carbon fiber driveshaft. You should really pay attention to Junior1--he's on the bleeding edge of N/A track performance on his heavily modified CTS-V (he's at 3366 lbs too, due to massive weight reduction efforts).

etcts-v

Ahh good thinking! I pulled the diff out last night anyways, planning up swapping it to the newest generation, maybe I should look at a gear swap while I'm at it.

I am running stock sized tires.

heavymetals

iTrader: (3)

I am very happy with the carbon fiber driveshaft.

KamaSutra

Driveshaft Shop, what is the weight of the 2 piece unit you're offering?

FuzzyLog1c

iTrader: (4)

Read the thread I posted. All of the weights are there---second page IIRC.

Driveshaft Shop

i dont have one made to weigh but i kinda remember it being 27lbs plus a few lbs for the plates.

Driveshaft Shop

a simple Exhaust wrap will make this work fine, it just needs to stay under 300 degrees. should ne be a hard thing to do.

Driveshaft Shop

OK, that would need to spin at 6962rpm @ 150mph. That shaft has a raw critical of 7251rpm. Now keep in mind all shafts will have both a critical speed and a "safe" factor, when the shaft passes the safe factor it will not break but its the point the material starts to stress or flex. Also keep in mind that no one has ever put a shaft into a machine and ran them to the point of breakage. This is a Theoretical number based on math. short blasts above the safe number will not damage the shaft, only sustained speed.

That being said the shaft would have a .91 safe factor due to the level of balancece, CV joint the U-joint not moving at a large angle. so with the 3:73 gear it would be 6335rpm, or about 138mph.

with the 3:55 gear is would be @ the 150mph mark. The carbon shaft would have a safe factor of about 220mph (or more) on the 9" and the 8.8 kits the dimension is different and the ends longer so these numbers would be a bit higher.


this is balancer at work

slowlaneblues06

iTrader: (2)

Frank is building a new 1 piece with 2 cvs for me now. I am torn about the critical speed, but the shaft will clear any shifter no problem from measurements. I may consider the Carbon Fiber and wrap my exhaust, but I am only street use so kind of hard to justify the extra cost. Sure is a great guy to deal with.

Definitely consider something with a CV in it, like the DSS 2 piece or his sson to be new 1 piece double CV. Should help avoid vibrations.

Consider this, why did cadillac put two cvs in the car? and on the new ones? To stop driveline vibration I would bet.

Driveshaft Shop

Yours will be a bit shorter being we have used the new 9" CV mounts. this is a picture of the part we made for the 9" and also have them for the 8.8 now.

slowlaneblues06

iTrader: (2)

It is a beautiful piece. Its bolted to my 9" Strange diff now, and reduces the extra adapters that are common with aftermarket driveshafts.

My actual shaft length is really only about 50" instead of the 60"+ gap for the driveshaft. 10" shorter definitely helps the critical speed, but Frank is the math guy and can explain much better than I could right now (still learnin