SM465 10 spline vs. 32 Spline HELP!!! - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 08-05-2011, 12:25 PM   #1 (permalink)
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SM465 10 spline vs. 32 Spline HELP!!!

I just bought a 1970 SM465 rebuilt with only 500 miles on it (guys motor threw a rod right after he rebuilt the tranny, now selling all drivetrain).

I have an ax-15 and np231 in my jeep right now.

I want the granny low of the SM465, and NP241 with the strength and durability. Also working on a budget of around $1000

My issue is that the SM465 is a 10-spline output shaft, which doesn't leave me many options on what t-cases to bolt up to it (adapters can be expensive)

My question is, if I find a cheap 32-spline SM465, can I swap the shafts so that my new internal gears and parts there were on the 10spline are now on the 32?
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Old 08-05-2011, 12:37 PM   #2 (permalink)
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Question = Yes.

Fyi, if you go with the 241 you will also need the adapter to mate them together. The 241 was used from mid '88 to '91 in square body Subs and K5's.

Also, the 32 spline 4spd was available with 208 t-cases from '81 to '88 in all but crew cabs. That adapter would probably interchange as the 208 and 241 are very similar but I'm not 100% sure.
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Old 08-05-2011, 12:51 PM   #3 (permalink)
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One more thing... The info I posted is all pass side drop stuff. If you need drivers drop stuff that's be '88+ new body trucks. I know the 465 was used but don't know for how long or if the adapter is different between left and right side drops.

Also the shifter tower placement changes depending on which body style truck it comes from.
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Old 08-05-2011, 02:20 PM   #4 (permalink)
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Yes you can change the output shaft between the two, you can also buy that shaft by itself (without buying another trans).

The 208 adapter will work with a 241, so any 81-91 4 speed truck with a 208 or 241 will physically get your combo together. The only difference in the adapters is that the 84 and older adapters use a "long" mounting foot and the older c-shaped transmission mounts while the 85 and newer adapters use the "short" mounting foot and a one piece transmission mount.
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Old 08-05-2011, 10:00 PM   #5 (permalink)
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If this is going in a Jeep be advised that the factory 32 spline output and adapter are quite long compared to the 10 spline. The length from bellhousing face to t-case flange is approximately the same as a 700R4 with a 241 adapter.

77K5 didn't mention this, but I will: ORD has a short 32 spline 465 mainshaft and a round adapter to go with it. $500 and you have a nice, short 32 spline 465 that would be perfect for a Jeep. Depending on what Jeep you have it would probably be short enough to run a doubler behind and still have a reasonable length driveshaft. A bulletproof 4 speed with a bulletproof 4:1 t-case setup. What's not to like?
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Old 08-16-2011, 04:57 PM   #6 (permalink)
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Thanks for the input. I have a 91 wrangler it's going to be in.

I'm set up on one tons and I pushed my rear axle back about 8 inches. I like the angle that I'm at now with the driveshaft with the 4.0l/ax15/np231 setup. I wouldn't want to go any longer. Especially since I'm running a flat belly skid plate. My driveshaft angle is just about the steepest I'd want, so the shortest shaft I could get on the 465 the better.

If I do go with the short shaft 32 spline, will I still need to use any adaptor if I use a np241 tcase? Or will it bolt to the back of the tranny?

Anyone have pictures of this setup?
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Old 08-16-2011, 07:15 PM   #7 (permalink)
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Quote:
Originally Posted by fatony View Post
Thanks for the input. I have a 91 wrangler it's going to be in.

I'm set up on one tons and I pushed my rear axle back about 8 inches. I like the angle that I'm at now with the driveshaft with the 4.0l/ax15/np231 setup. I wouldn't want to go any longer. Especially since I'm running a flat belly skid plate. My driveshaft angle is just about the steepest I'd want, so the shortest shaft I could get on the 465 the better.

If I do go with the short shaft 32 spline, will I still need to use any adaptor if I use a np241 tcase? Or will it bolt to the back of the tranny?

Anyone have pictures of this setup?
ORD sells the mating adapter for the short shaft. You need both to mount the 241 (or any other round pattern GM case).

http://offroaddesign.com/catalog/sm465shortshaft.htm
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