31-spline vs 32-spline NP205

[Fred_M1010]

I planning on putting a doubler box in front of a Chevy 32-splined NP205.

But I also have a Ford 31-splined NP205...
I think I've heard somewhere that the Fords input shaft is stronger.
So I'm thinking of swapping input shafts between the boxes...

But is the difference worth it?

 

[sweetk30]

http://offroaddesign.com/catalog/doubler.htm

31 and 32 spline only from ord .

I do know its a short 32 spline input needed in the 205 .

 

[Hogback Fabrication]

The 32 spline shaft is bigger/stronger, but only by a few percent. They are very close in size, but the 32 is a touch bigger.

 

[Fred_M1010]

Hmm, they didn't mention any difference between 31 and 32 splines there...
Is it my memory that's acting up again

It's the Behemoth box I'm thinking of btw:
http://coloradok5.com/forums/showthread.php?t=312782

 

[Fred_M1010]

The 32 spline shaft is bigger/stronger, but only by a few percent. They are very close in size, but the 32 is a touch bigger.

Thanks!
Then it was my memory that failed after all

 

[BehemothDT]

I planning on putting a doubler box in front of a Chevy 32-splined NP205.

But I also have a Ford 31-splined NP205...
I think I've heard somewhere that the Fords input shaft is stronger.
So I'm thinking of swapping input shafts between the boxes...

But is the difference worth it?

Minimum diameter of the shaft is the determining factor when it comes to breaking strength. The 32 spline is 0.020" bigger diameter than the 31.
The average human hair is about 0.003".
31 spline NP205s are much more common than the short 32. In my experience, 31 spline is easier to find and 1/3 of the cost of short 32.

 

[wasted wages]

IIRC...the bonus of the ford box is the front output shaft is a 32 spline shaft that allows the use of a 1410 yoke on the front. You can swap the output shaft into the chevy box though....
I dont know if any chevy boxes ever came factory with a 32 spline front.

 

[muddermilitia]

IIRC...the bonus of the ford box is the front output shaft is a 32 spline shaft that allows the use of a 1410 yoke on the front. You can swap the output shaft into the chevy box though....
I dont know if any chevy boxes ever came factory with a 32 spline front.

This^^^ Take the front output from your ford 205 and put it into the chevy 205

 

[Fred_M1010]

It looks like I have the long 32 spline input, so I' guess I'll have to gut the Ford-case anyway, so I might as well take the front output from it as well...


BTW, how much does a used short Chevy 32 spline input, or a Ford 31 spline input usually cost?
(In case I should sell the Ford box instead to fund the doubler...)

 

[BehemothDT]

BTW, how much does a used short Chevy 32 spline input, or a Ford 31 spline input usually cost?
(In case I should sell the Ford box instead to fund the doubler...)

Right now tbere are several on ebay. 31s starting at $40, short 32s starting at $135.
Long 32s are about same cost as short.

You will be $ ahead if you swap it all into the chevy case and ebay the rest.
I can part out a good ford 205 for 3x what I can sell it whole.

 

[sweetk30]

if you need pointers here ya go buddy http://coloradok5.com/forums/showthread.php?t=253000

 

[wasted wages]

Check with ORD ...they got my 32 spline short input when I installed my doubler...wont say how much here, but it was a decent price...

 

[Fred_M1010]

I ended up ordering a 31 spline input shaft and a NP241 DIY doubler kit from Behemoth

if you need pointers here ya go buddy http://coloradok5.com/forums/showthread.php?t=253000

Thanks, a lot of good info there

 

[muddermilitia]

I ended up ordering a 31 spline input shaft and a NP241 DIY doubler kit from Behemoth

Cool! Report back with pictures and a full review