203 to 241 adapter?

[BUDDY]

I posted this in the garage here, but thought this would be a good place to ask as well.

I have in my parts pile -

NP203 range box
fitz all spacer/adapter
700r4 transmission (to be rebuilt)

I was going to put all of this in my 72 blazer in front of the np205 that it came with, with some form of doubler adapter, (NWF, ORD, etc.).

But, I bought a 1990 blazer, so i got to thinking. Could I put the 203 range box & adapter/spacer in front of the 241 t-case that resides in my new to me blazer?

My impression is that this would be a feasible swap, but I'm not familiar enough with the configuration of the OE adapter between the 700r4 & the 241. Spline-wise it should all be the same 27 splines throughout, but the bolt pattern is my big question.

Anybody know the answer?

Just thought of this (at work), & my truck is parked at home or I'd just climb underneath it to find out for myself.

Thanks,
Buddy

 

[miniwally]

I think all of this is not really valid since doubling the torque to the 241 will make it want to explode on a regular basis.

I would stick with the conventional thinking of a doubler.

Not to bash your idea but I foresee many problems strength wise with your proposed setup.

 

[scouthead]

I think all of this is not really valid since doubling the torque to the 241 will make it want to explode on a regular basis.

I would stick with the conventional thinking of a doubler.

Not to bash your idea but I foresee many problems strength wise with your proposed setup.

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The 241s are strong cases, they just don't like smacking into rocks. People put doublers in front of them all the time. The only thing I don't like is the slip yoke rear, but that's fixable (just a little more $).

Don't know about using a 203 range box, but there are better options out there. How about another 2.73:1 low range gear in front of the 241? That 7.45:1 low gear puts any 203/205 gearing to shame. I think it's the "Box for rocks" or "box 4 rocks" adapter... and it looks very affordable compared to other doubler kits...

If you just want to use the 203 because you have it, I can understand that. I have heard you can redrill the face of the 203 for the 6 bolt round pattern, and it will bolt onto the 700r4/208 (or 241) adapter. I am doing this in my toyota... but I'm not sure what adapter would be out there to mate the 203 to the 241. ?

 

[sweetk30]

here is some info on 203 reman and redrill for 208-241 style adaptor.

http://coloradok5.com/forums/showthread.php?t=253000