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Discussion Starter · #1 ·
So, after much deliberation, (and another failed trac-loc causing drama at VIR), I am going back to a T2R. While I am in there, I am going to go ahead and swap to 3.73s. My only issue with this is that I need a driveshaft that will not fly apart at 8,500-9000 RPM (it is attainable with my next round of changes). What I want to know is why people say that the factory 5.0 manual driveshafts do not fit.
 

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They're too short. I can tell you from experience. Wanted to put a 5.0 driveshaft and sell my 1 piece from my v6 to free up some money. When I went to do the swap, the 5.0 driveshaft was too short.
 

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interested in seeing what this beast mode set up is going to be thats gonna flow at those rpms :thumb:

Edit: Derp, you probably mean driveshaft total rpm, not engine rpm...
 

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Would any of you be down to drive to PA next year for American muscle show?


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I know a few guys that run an aftermarket GT 1-piece, but requires the GT's pinion flange.

Due to this reason, I'm assuming the GT flange makes up the distance that the GT shaft is "short".

Volt, I know you swapped pinion flanges, is the GT flange thicker than the V6 (Cobra) flange?
 

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I know a few guys that run an aftermarket GT 1-piece, but requires the GT's pinion flange.

Due to this reason, I'm assuming the GT flange makes up the distance that the GT shaft is "short".

Volt, I know you swapped pinion flanges, is the GT flange thicker than the V6 (Cobra) flange?
I just went back through my old thread from the swap, but i dont have any info in there. I dont remember them being considerably different, a few 16ths if anything... granted, a few 16ths is the difference between it fitting and it not...
 

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I had swapped over the flanges too because I was doing a whole rear end swap. So yes there's that aspect of it that won't allow a 5.0 drive shaft to fit on a 3.7.

3.7 has 4 bolts in the rear for ds to flange.
5.0 has 6 bolts in rear for ds to flange.

And also too short.


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So the ends that bolt to the trans are the same?

The new GT flange is only $44.08 from Ford.

Item 6: 5R3Z-4851-A
REAR AXLE for 2012 Ford Mustang

If that's the case i may just throw a GT driveshaft on her car and call it a day.

Yea, transmission side is the same. Driveshaft just ended up being too short to fit on the v6 for some reason (could be because v6 was auto and I think the v8 drive shaft was from a manual but not 100% sure if it was from a manual) and this was after swapping flange


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Discussion Starter · #11 ·
So I should probably elaborate a bit. By 8,500-9,000 rpm, I meant driveshaft velocity, not engine. I have found someone who is going to let me borrow his driveshaft and flange at some point in the off season to do a test fit.
 

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So I should probably elaborate a bit. By 8,500-9,000 rpm, I meant driveshaft velocity, not engine. I have found someone who is going to let me borrow his driveshaft and flange at some point in the off season to do a test fit.
Please let us know if it fits, it would save us (and everyone else obviously) a ton of money.
 

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If you look under the car itself the transmission mount goes in a set of holes farther back on the GT then on the V6 so there's your difference in the length

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Much easier and less weight to just change to an aluminum driveshaft made for our V6's. Just my opinion :)
 

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As many commenter already indicated, GT shaft is shorter. Here is my thought on the reason of the different.

Since the whole vehicle dimensions are same between GT and V6 but V8 engine has 2 more cylinders and longer than V6 engine, these 2 more cylinders each up some space and make drivershaft of GT shorter.

They might also have different diameter due to different load, but I think this probably isn't a problem.
 

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Did we ever get anywhere on this?
I know there are 2 sets of holes for the Trans Mount, one for the V6 and the other for the GT, 2 inches difference making the GT shaft to short for the V6.
I know of at least 2 people that are running the Torsion rear end in their V6 with a GT shaft that had the front shaft lengthened to fit the V6, but they had to lengthen it to work.
 
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