SM465 4x4 Output shaft 205vsRockwell - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Dieselwrencher** · 11-26-2008, 02:17 AM

I just baught a 69 K10 and it has the sm465/rockwell combo. I would like to switch over to the NP205 because I think the 205 is stronger, I have one, and the rockwell is junk already. I know I will have to change the tcase shifter, the drive shafts, and the tcase adapter. But what about the output shaft of the trans? Is the output shaft the same for the rockwell and 205? I am guessing no. Tell me what you know.

Thanks Ryan.

**Yukon Jack** · 11-26-2008, 06:39 PM

They are the same. I'm doing it right now on my 69 K20. You just need the coupler and adapter for the NP205 to get it connected to your existing SM465.

**Dieselwrencher** · 11-26-2008, 08:19 PM

Thanks Yukon jack. Does anyone know a good place to get a new coupler for this? I have the tcase, adapter but no coupler. I also might need a shifter. I was going to keep the rockwelll in there until I looked at it again. What a puny little turd.

milled · 11-26-2008, 10:10 PM

Google np250 parts. they usually run 50-90 bones.

**Dieselwrencher** · 11-26-2008, 11:43 PM

Thanks Milled.

jeffspower · 11-27-2008, 12:04 AM

I should have a decent used coupler if you want to save some cash... but live with a little wear. Free + shipping.

justcuz · 11-27-2008, 12:14 AM

The early couplers are a ten spline output, if I remember correctly. A little wear won't hurt much. The best reason to replace the Rockwell is parts availability, they were pretty strong transfer cases.

lowe137 · 11-27-2008, 12:39 AM

check out tbtrans.com thats where i got my parts cheapest i could find.. i switched my burb over from rockwell to 205. i had to recently change my tranny output shaft and coupler(see recent posts)..

**Dieselwrencher** · 11-27-2008, 01:02 AM

Jeffspower, you have mail!

11-26-2008, 02:17 AM	#1
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,140	SM465 4x4 Output shaft 205vsRockwell I just baught a 69 K10 and it has the sm465/rockwell combo. I would like to switch over to the NP205 because I think the 205 is stronger, I have one, and the rockwell is junk already. I know I will have to change the tcase shifter, the drive shafts, and the tcase adapter. But what about the output shaft of the trans? Is the output shaft the same for the rockwell and 205? I am guessing no. Tell me what you know. Thanks Ryan.

11-26-2008, 06:39 PM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,683	Re: SM465 4x4 Output shaft 205vsRockwell They are the same. I'm doing it right now on my 69 K20. You just need the coupler and adapter for the NP205 to get it connected to your existing SM465. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

11-26-2008, 08:19 PM	#3
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,140	Re: SM465 4x4 Output shaft 205vsRockwell Thanks Yukon jack. Does anyone know a good place to get a new coupler for this? I have the tcase, adapter but no coupler. I also might need a shifter. I was going to keep the rockwelll in there until I looked at it again. What a puny little turd. Last edited by Dieselwrencher; 11-26-2008 at 08:21 PM.

11-26-2008, 10:10 PM	#4
milled Registered User Join Date: Feb 2008 Location: arvada colorado Posts: 105	Re: SM465 4x4 Output shaft 205vsRockwell Google np250 parts. they usually run 50-90 bones. __________________ 1970 k20 350 4speed hd44 14b Circumventing the language filter is against site rules

11-26-2008, 11:43 PM	#5
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,140	Re: SM465 4x4 Output shaft 205vsRockwell Thanks Milled.

11-27-2008, 12:04 AM	#6
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: SM465 4x4 Output shaft 205vsRockwell I should have a decent used coupler if you want to save some cash... but live with a little wear. Free + shipping. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

11-27-2008, 12:14 AM	#7
justcuz Registered User Join Date: May 2008 Location: Alta Loma, Ca. Posts: 930	Re: SM465 4x4 Output shaft 205vsRockwell The early couplers are a ten spline output, if I remember correctly. A little wear won't hurt much. The best reason to replace the Rockwell is parts availability, they were pretty strong transfer cases.

11-27-2008, 12:39 AM	#8
lowe137 Registered User Join Date: May 2008 Location: cali Posts: 43	Re: SM465 4x4 Output shaft 205vsRockwell check out tbtrans.com thats where i got my parts cheapest i could find.. i switched my burb over from rockwell to 205. i had to recently change my tranny output shaft and coupler(see recent posts)..

11-27-2008, 01:02 AM	#9
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,140	Re: SM465 4x4 Output shaft 205vsRockwell Jeffspower, you have mail!



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