SM265 mated to a 203 ???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tylerdurden · 01-22-2008, 02:59 PM

Ok I have been through the searches and could not find a answer for my questions. First I have a sm465, that came out of a early 80's 3/4, which has the 35 spline count output shaft. Secondly I have three 203's, which two have the aluminum output shaft case from late model 70's 1/2 th350 vehicles (27 input spline). The third transfer case has no tag but has the cast iron output case.
Ok my questions are as follows:
1. Which transfer case is better, the aluminum output case shaft or the
iron one?
2. Where can I look for an oem adaptor for the sm465 to mate to the 203?
Because, I know an aftermarket piece will cost a pretty penny.
3. Which one do I need to modify? For the two to mesh together?
I want to make a doulbler once I find a 205 down the road.

duallyjams · 01-23-2008, 09:25 AM

Find a np205 with adapter now to mate up to the sm465 and save the np203 for the doubler.

tylerdurden · 01-23-2008, 10:58 AM

I thought I would need to modify the input shaft from the np203 and find a adaptor plate to mate them together. Does not the np203 front half get used on the doubler while the rear section is a np205

**88JRFAN** · 01-23-2008, 11:07 AM

Check Out Offroaddesign.com, They Will Probably Have What You Need.

tylerdurden · 01-23-2008, 12:33 PM

Is there such a thing as an adapter for this combo? I keep on reading about sm465 mated to np205s but never a np203; or th350/700r4 to np203s. I checked offroad designs and advanced adapters with no luck.

jeffspower · 01-23-2008, 01:51 PM

Here's a complete setup on KC craigslist

http://kansascity.craigslist.org/pts/543149330.html

tylerdurden · 01-23-2008, 02:51 PM

Thanks jeffspower for the info. Now I have a pic to go off of. Now I know why no one uses these sm465 on doubler set ups. I can not believe that only one year is all it was produced. Oh yea it never seems to fail, when Iam broke all the deals come up. When I have money to spend on the project, I always seem to buy it at full price. What a buget build up! lol lol

01-22-2008, 02:59 PM	#1
tylerdurden Registered User Join Date: Sep 2005 Location: Austin, TX Posts: 20	SM265 mated to a 203 ???? Ok I have been through the searches and could not find a answer for my questions. First I have a sm465, that came out of a early 80's 3/4, which has the 35 spline count output shaft. Secondly I have three 203's, which two have the aluminum output shaft case from late model 70's 1/2 th350 vehicles (27 input spline). The third transfer case has no tag but has the cast iron output case. Ok my questions are as follows: 1. Which transfer case is better, the aluminum output case shaft or the iron one? 2. Where can I look for an oem adaptor for the sm465 to mate to the 203? Because, I know an aftermarket piece will cost a pretty penny. 3. Which one do I need to modify? For the two to mesh together? I want to make a doulbler once I find a 205 down the road.

01-23-2008, 09:25 AM	#2
duallyjams Registered User Join Date: May 2007 Location: Deale Md Posts: 4,663	Re: SM265 mated to a 203 ???? Find a np205 with adapter now to mate up to the sm465 and save the np203 for the doubler. __________________ James 63 GMC V6 4speed carryall 65 chevy swb bbw V8 auto 68 K20 327/4 speed, buddy buckets 2002 GMC CC Dually Duramax 64 GMC lwb 3/4 V6 4speed SOLD 66 GMC swb bbw buddy buckets SOLD IG duallyjams The only thing that stays the same is constant change!

01-23-2008, 10:58 AM	#3
tylerdurden Registered User Join Date: Sep 2005 Location: Austin, TX Posts: 20	Re: SM265 mated to a 203 ???? I thought I would need to modify the input shaft from the np203 and find a adaptor plate to mate them together. Does not the np203 front half get used on the doubler while the rear section is a np205

01-23-2008, 11:07 AM	#4
88JRFAN LET'S GO RACIN' Join Date: Oct 2007 Location: SALINA,KS Posts: 1,212	Re: SM265 mated to a 203 ???? Check Out Offroaddesign.com, They Will Probably Have What You Need. __________________ Daren 04 Chevy Extend cab 2500HD 6.0 Liter 4x4 71 CHEVY 3/4 4X4 402 BB, th400/np205, dana44/eaton ho52 w/4:10-TOY Rip El Jay RIP BOBBO'S MOM

01-23-2008, 12:33 PM	#5
tylerdurden Registered User Join Date: Sep 2005 Location: Austin, TX Posts: 20	need a new site Is there such a thing as an adapter for this combo? I keep on reading about sm465 mated to np205s but never a np203; or th350/700r4 to np203s. I checked offroad designs and advanced adapters with no luck.

01-23-2008, 01:51 PM	#6
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: SM265 mated to a 203 ???? Here's a complete setup on KC craigslist http://kansascity.craigslist.org/pts/543149330.html __________________ '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

01-23-2008, 02:51 PM	#7
tylerdurden Registered User Join Date: Sep 2005 Location: Austin, TX Posts: 20	Re: SM265 mated to a 203 ???? Thanks jeffspower for the info. Now I have a pic to go off of. Now I know why no one uses these sm465 on doubler set ups. I can not believe that only one year is all it was produced. Oh yea it never seems to fail, when Iam broke all the deals come up. When I have money to spend on the project, I always seem to buy it at full price. What a buget build up! lol lol

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