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Old 08-14-2011, 03:02 PM   #1
04Mach1Blurr
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Aluminum DS with an 03 IRS Compatable?

Im looking into buying an aluminum drive shaft for my TR3650 Mach with a 2003 Built IRS. My question is will this work? If not what can be done to make it work, and is it worth it?

2003 Cobra OEM drive shaft with both yokes removed
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Old 08-15-2011, 03:57 PM   #2
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Re: Aluminum DS with an 03 IRS Compatable?

Yes it will work. See sig.

Are you using the cobra diff flange right now or the Mach flange? The back flange on the driveshaft has to match the diff flange. Can't mismatch Mach and Cobra flanges. If you use the cobra driveshaft flange and diff flange, you'll need to use the hybrid u joint which I'm assuming you already have in the car.
Been awhile since I've done this, so I'm a little rusty myself...
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Old 08-15-2011, 04:06 PM   #3
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Re: Aluminum DS with an 03 IRS Compatable?

For the IRS swap, I just swapped the differential flange to use my stock driveshaft. No aftermarket or other u joint was used. So with my understanding, the aluminum driveshaft would not work without a different u joint? Thanks for helping my man
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Old 08-15-2011, 07:04 PM   #4
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Re: Aluminum DS with an 03 IRS Compatable?

If you put the diff flange from your SRA on the IRS and re-used your old driveshaft, then I don't see you needing to change anything. Just remember: can't mismatch flanges. Wont fit.

The aluminum FRPP unit (which is made by a company called "Neapco Drivelines) will directly swap with a stock Mach/Gt driveshaft.

Since I used the entire IRS assembly, differential flange and all, I had to mate my Frpp driveshaft to it with the cobra driveshaft flange and a hybrid u-joint that would accept the frpp driveshaft for a tr3650 but also adapt to the cobra differential flange. Kind of confusing, but not really.

Incase you were wondering, the aluminum driveshaft kicks azz. Id have a reputable driveshaft shop balance it out for you before installing. They're "production" pieces and aren't what you would call "perfect". I didn't know that when I put mine on.
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Old 08-16-2011, 12:07 PM   #5
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Re: Aluminum DS with an 03 IRS Compatable?

Looking to do the same mod, just need to call my shop to see how they did the DS/Flang when they installed my '03 IRS.

BY FAR the IRS was the best mod I did to this car!!! LOVE it, just had to get used to the "Cobra Thump" when shifting.
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Old 08-21-2011, 11:33 AM   #6
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Re: Aluminum DS with an 03 IRS Compatable?

Does anybody know if an 01 cobra driveshaft is the same as an 03? Found one on svtp and its the last part I need for my T56 swap.
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Old 08-24-2011, 06:24 PM   #7
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Re: Aluminum DS with an 03 IRS Compatable?

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Originally Posted by diamondstarmach View Post
Does anybody know if an 01 cobra driveshaft is the same as an 03? Found one on svtp and its the last part I need for my T56 swap.
01 cobras didn't come with t56, so no.
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Old 03-22-2012, 02:37 PM   #8
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Re: Aluminum DS with an 03 IRS Compatable?

Wanted to re-bump this thread as I have now bought an 03 cobra's aluminum drive shaft. I bought the drive shaft with both yokes removed from it. My new question is, am I able to swap my stock tr3650 and stock drive shaft yokes into the aluminum drive shaft? Will there be a length difference? Will I need to use a new u-joint or spacer for it to work?
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Old 03-22-2012, 05:05 PM   #9
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Re: Aluminum DS with an 03 IRS Compatable?

That drive shaft will be too short. The t-56 is a slightly longer trans, hence the shorter drive shaft....i'm not sure of a way to make it work with a 3650. Maybe someone can enlighten us....
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Old 03-22-2012, 05:22 PM   #10
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Re: Aluminum DS with an 03 IRS Compatable?

Thank again for the help and post after a year! Thats what I was afraid of... it being to short. when it gets delivered, I will measure both and line it up next to my stock drive shaft and see what the overall difference is. Is the yokes length different or the shaft itself?
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Old 03-22-2012, 05:32 PM   #11
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Re: Aluminum DS with an 03 IRS Compatable?

http://www.steeda.com/store/steeda-h...d-mustang.html

I found this drive shaft spacer, but it says its not for IRS equipped vehicles. Wonder if the bolt pattern is different or what?
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Old 03-22-2012, 06:01 PM   #12
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Re: Aluminum DS with an 03 IRS Compatable?

I've also read http://forums.corral.net/forums/94-9...riveshaft.html that the OEM cobra aluminum drive shaft is 43.5inches compared to the T45/T3650 is 45.5inches. An overall 2 inch difference which would leave the yoke not close enough to the differential to be deemed safely equipped.

Does the ride height of the car change the geometry of the drive shaft as well? I would think so as the angle of the differential would change.
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Old 03-23-2012, 06:16 PM   #13
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Re: Aluminum DS with an 03 IRS Compatable?

Forgot to mention, I only swapped the flange in the differential when i did my IRS swap. So what I'm thinking, is that it is possible to just swap both flanges off my stock drive shaft and put it on the aluminum drive shaft. Think this will work?
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Old 03-23-2012, 08:53 PM   #14
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Re: Aluminum DS with an 03 IRS Compatable?

Quote:
Originally Posted by 04Mach1Blurr View Post
Forgot to mention, I only swapped the flange in the differential when i did my IRS swap. So what I'm thinking, is that it is possible to just swap both flanges off my stock drive shaft and put it on the aluminum drive shaft. Think this will work?
I really don't think switching flanges is going to make up the difference...
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Old 03-23-2012, 11:09 PM   #15
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Re: Aluminum DS with an 03 IRS Compatable?

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Originally Posted by 311-420 View Post
I really don't think switching flanges is going to make up the difference...
lol sorry, didn't mean just the flange that would fix the problem, but swapping both yokes over with a 1330/1350 u-joint and adding the drive shaft spacer to the terminator aluminum drive shaft. I don't see why the spacer wouldn't work with a stock mustang yoke thats for an SRA correct?
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Old 03-24-2012, 11:46 AM   #16
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Re: Aluminum DS with an 03 IRS Compatable?

From my other thread on SVTP in the Terminator Drive-train section:

Quote:
Originally Posted by fastback brian View Post
the spacer is not enough, they are maybe 1/2 inch thick.. and the terminator shaft will need a hybrid joint to fit the 3650 yoke and the mustang gt flange, or you can go back to the terminator flange but then the spacer wont fit....:shrug:
I agree upon both yokes needing the new hybrid joint to be able to work on the cobra aluminum shaft, (forgot about the front haha, but thats what these forums are for, R&D) The other thing is I bought the cobra drive shaft with out the yoke and flange since the owner needed them. Thats why I was looking to use my parts and swap it in somewhat directly with the spacer. Thanks for your thoughts as well!

Quote:
Originally Posted by shurur View Post
T45/T3650 to SRA is 45.5" (1996-98 cobra, 1996-04 GT "J"..and 79-93+ foxbody "G"
T45/T3650 to IRS is 44.5" (1999-01 cobra)
T56 to IRS is 43.5" (2003-04 terminator)

Ford makes 43.5" AL DS and 45.5" AL DS.

What you essentially have is a 1999-2001 cobra now.

What I just did was to buy a P-71 police interceptor AL DS on Ebay (55.5") and get it cut to 44.5", Flange, yoke and joints swapped over/replaced, balanced...works great.

Some 1999-2001 cobra owners have bought the Ford "J" AL DS (45.5") and wedged it in...it "works" because the the IRS is fixed in position...but there is no 3/4"-1" slop..I can't imagine that is a good thing.

*****************
Also...I believe they make a 31 spline yoke that is 8.5" vice the standard 7.5" yoke...(Summit racing??..Lethal??..late model resto..) that could make up that 1" you need if you go with the 43.5" terminator AL DS...as stated above you will need a 1330/1350 Hybrid U-joint to go from that DS to that yoke...but you should change the u-joint out for new anyway...

The advantage to this approach would be that you could have the original teminator yoke reinstalled when you get that T56 down the road ;-)

Others who actually know about this possible approach please chime in...TRBO VNM??
Absultely appreciate the numbers man! I get your concept and have seen alot of other people cutting longer driveshafts down. I'm looking to try this out on the cobra shaft if possible to be able to add another option for guys not using a 31 spline yoke from the transmission such as myself and other TR3650/T45 owner. I saw the 31 spline yoke on summit, but I can't use it with the stock transmission correct?

So what I'm looking at now is my oem yoke+ hybrid u joint+ cobra drive shaft+ hybrid u joint+ oem Mach/gt flange+ the 11/16ths drive shaft spacer into the IRS differential. Leaving roughly (.5) inches short of the 00/01 cobra 44.5'' setup for an aluminum drive shaft utilizing the IRS. :read:

Is that correct? Are you sure about the 1inch loss of the TR3650 from SRA to IRS?
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Old 03-24-2012, 04:44 PM   #17
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Re: Aluminum DS with an 03 IRS Compatable?

Give it a shot. Only way to know. More than likely, you are in uncharted waters with this one as that's a very unusual setup.

I'm interested to find out the results..
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Old 03-24-2012, 05:11 PM   #18
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Re: Aluminum DS with an 03 IRS Compatable?

Thanks I appreciate it, I do want to try my own thing as there aren't many people "fabricating" parts anymore. But what it comes down to is $13.73 more to buy the ready aluminum drive shaft off of American Muscle with the 6% discount code.

I think its absolutely plausible to do what I've researched, but after the research on parts and shipping it may not be totally worth it if I can get a brand new unit for ~$14 more.

What I want to look at now is the weight of the AM aluminum drive shaft in full compared to the cobra drive shaft in full plus the 11/16th spacer. I doubt its anything much. But what this does give me is the opportunity to use the cobra drive shaft down the road for a t56 swap if I wanted to do one. Thing is I am graduating college this May and doubt I'll have enough cash ready to do a t56 swap anytime soon.


Decisions decisions.
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