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11-07-2011, 11:52 PM
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#1 |
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Registered User
Join Date: Mar 2010
Location: Minneapolis Minnesota
Posts: 70
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Stock Muncie SM465 and T221
I need to rebuild the stock T221 or swap it for a new Tcase. I continue to read good things about my transmission, and like the low gearing, so i am keeping the Muncie 4speed. About 100,000 on the muncie, we are the original owners of the truck. What t-case will bolt in easy? Thanks.
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11-08-2011, 12:13 AM
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#2 |
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Junk Yartist
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,203
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Re: Stock Muncie SM465 and T221
NP205 10 spline. Direct bolt in.
__________________
-Jeremy YOU ONLY FAIL IF YOU STOP TRYING 70 Crew Cab Build Link 70 GMC Suburban 4X4 build thread 95 Yukon Daily Driver Rebuilding an NP205 |
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11-08-2011, 03:01 AM
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#3 |
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Registered User
Join Date: Aug 2011
Location: Sacramento, California
Posts: 79
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Re: Stock Muncie SM465 and T221
what he said^
__________________
1970 C/20 4x4, 350, sm465, np205(She tipped over... total rebuild from the frame up!)  ya gotta keep on keepin' on, Life's a garden, dig it! |
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11-08-2011, 01:54 PM
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#4 |
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Post Whore
 
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,689
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Re: Stock Muncie SM465 and T221
When my T221 ate up a bearing I swapped in an NP205 and found I had to make a few changes so I wouldn't call it a direct swap.
Here's a thread where I talk about my swap.
__________________
1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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11-13-2011, 03:33 PM
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#5 |
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Registered User
Join Date: Sep 2007
Location: Mundelein, IL
Posts: 862
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Re: Stock Muncie SM465 and T221
are you sure it's an sm465? the sm420 originally came with the t221. just want you after the right info...
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time is inversely proportional to money; that's why it takes me so long 1967 K10 1967 Camaro |
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11-14-2011, 12:14 AM
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#6 |
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Junk Yartist
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,203
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Re: Stock Muncie SM465 and T221
I think 67-68 had the SM420. I think 69 was the first year for the SM465.
My 69 has the SM465 and the T-221.
__________________
-Jeremy YOU ONLY FAIL IF YOU STOP TRYING 70 Crew Cab Build Link 70 GMC Suburban 4X4 build thread 95 Yukon Daily Driver Rebuilding an NP205 |
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11-14-2011, 12:01 PM
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#7 |
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Post Whore
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,689
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Re: Stock Muncie SM465 and T221
My 69 originally had a three on the tree manual hooked to it's T221. It would constantly bind so I swapped in an SM465 that had been mated to a T221. As jbclassix stated, the SM465 T221 combo was offered and I, too, think it occurred in 69.
__________________
1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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11-15-2011, 05:48 PM
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#8 |
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Registered User
Join Date: Mar 2010
Location: Minneapolis Minnesota
Posts: 70
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Re: Stock Muncie SM465 and T221
I am not sure where I got these T221 diagrams, but I hope they help others.
By the way, what's a "gear splitter" and what does it do? |
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07-20-2013, 08:32 PM
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#9 |
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Registered User
Join Date: Mar 2010
Location: Minneapolis Minnesota
Posts: 70
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Re: Stock Muncie SM465 and T221
I found a T221 model N 1 TCase mated to a SM465 that was supposedly in a 3/4 ton 67 chevy. See photo. Will this transfer case bolt right in to replace my T221 model N 3 Tcase that is in my 68 1/2 ton? Tags on the cases both have 1.94 gear ratio. the only difference i see is the model 3 vs 1 I have same SM465. Apparently the 67 also had a 327 v8 as I do. Here is the one i found, but i cant load photo of mine. thanks!!![ATTACH]1134447
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