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06-12-2016, 04:46 PM
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#1 |
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Registered User
Join Date: Jun 2016
Location: Maynardville tennessee
Posts: 3
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1970 k20 transmission conversion
Hello everyone I'm new to the forum. My question is this I'm looking at buying a 1970 k20 (4x4) it has factory automatic transmission in it now and transfer case, could I change this transmission to a factory 4 speed and keep the transfer case or would the transfer case need to be changed moved etc? Thank you in advance for any feedback!
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06-12-2016, 04:56 PM
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#2 |
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Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: 1970 k20 transmission conversion
If I was going for a manual then I'd look into the NV4500 setup. Plenty of swap on this site, check out the search option.
Plan on different length driveshafts for any swap, just my guess. SM465 was the factory 4 speed though, with granny gear.
__________________
The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" |
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06-12-2016, 05:04 PM
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#3 |
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Registered User
 
Join Date: Apr 2012
Location: Lehi,Utah
Posts: 1,330
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Re: 1970 k20 transmission conversion
The transfer case can stay in its original position. However the adapter for a 4 speed is different also the spline count of an automatic is 27 and a 4 speed is 10 I think. When doing a swap like this it would be advantageous to have a donor truck.
Last edited by bluek5; 06-12-2016 at 06:55 PM. Reason: Spline count correction |
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06-12-2016, 05:08 PM
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#4 |
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Registered User
Join Date: Apr 2012
Location: Lehi,Utah
Posts: 1,330
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Re: 1970 k20 transmission conversion
Here is a 4 speed adapter.
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06-12-2016, 05:53 PM
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#5 |
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Registered User
Join Date: Jun 2016
Location: Maynardville tennessee
Posts: 3
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Re: 1970 k20 transmission conversion
So the 4 speed would not work because the spline count is not correct? Or can u get a adapter to make it work with the transfer case?
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06-12-2016, 06:00 PM
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#6 |
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Senior Member
Join Date: Apr 2013
Location: Danvers Minnesota
Posts: 967
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Re: 1970 k20 transmission conversion
You would need to change your input shaft also in the transfer case. Along with coupler and adapter pictured above. The drive shafts can be reused. I just went from 4speed to automatic
__________________
1972 K10 SWB wife's driver 1967 Pontiac GTO Big Bird - 1972 Longhorn K30 http://67-72chevytrucks.com/vboard/s...d.php?t=753294 |
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06-12-2016, 06:37 PM
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#7 |
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Registered User
Join Date: Oct 2015
Location: Elsberry Mo
Posts: 224
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Re: 1970 k20 transmission conversion
I recently did the same thing yes you do have to get a 4 speed to a NP 205 transfer case adapter which are not hard to find they used the same one up into the mid 80's. your transfer case is a 27 spline and your SM 465 will be a 10 spline. You and buy that adapter sleeve from Off Road Design that is 10x27 spline part# GU4011-A and you will be in business and no need to change input shaft on the transfer case.
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06-12-2016, 06:48 PM
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#8 |
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All about them K’s
 
Join Date: Jun 2014
Location: Farmington, New Mexico
Posts: 6,266
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Re: 1970 k20 transmission conversion
You can buy all the parts new from off road design. I don't believe the 205 adapters from ord are not cast iron like the originals are however.
__________________
Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 
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06-12-2016, 07:48 PM
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#9 |
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Registered User
Join Date: Jun 2016
Location: Maynardville tennessee
Posts: 3
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Re: 1970 k20 transmission conversion
Thanks for the feedback!
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06-12-2016, 07:52 PM
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#10 |
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Registered User
Join Date: Oct 2015
Location: Elsberry Mo
Posts: 224
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Re: 1970 k20 transmission conversion
No problem and good luck and don't give up. Real men have a third pedal!! LOL
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