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4spd Muncie behind an LSx - in my 71' C10

Old Nov 29, 2012 | 06:34 PM
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Default 4spd Muncie behind an LSx - in my 71' C10

Is anyone got experience running a 4spd NP-440 (A833) behind an LSx. Im doing an LQ4 swap in my 71 C10 and want to keep the 4spd manual tranny. This is not my area of expertise so any help will be appreciated. Which flywheel clutch setup will work the best. Looking to do a LQ4/L92 head with bigger cam in this setup

Last edited by Benlugchev; Nov 29, 2012 at 07:46 PM. Reason: change tranny
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Old Nov 30, 2012 | 08:26 AM
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I can't remember for sure, but I know I had to get a special bell housing to get it the right length. I used the flywheel and pressure plate from the previous setup, it was behind a 350, and I had to search different year vehicles at autozone for the correct size and spline count clutch disc. As far as what brands, I don't know because I don't have my setup running yet.
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Old Nov 30, 2012 | 09:50 AM
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I am interested in finding out also I am building a 70 2wd blazer roadster and am wanting to run the same set up
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Old Nov 30, 2012 | 05:09 PM
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Looks like I found my answer...

PACE Performance - OMW621LS - GM LS Gen III 11"/12" Clutch Manual Transmission Bellhousing - For Use With Car 3 & 4 Speeds - Muncie, Saginaw, Borg Warner, Richmond Transmissions

GM Flywheel PN# 12561680 & 12" clutch and pressure plate

Also came across this in my research
https://ls1tech.com/forums/conversio...s-motor-2.html

Last edited by Benlugchev; Nov 30, 2012 at 05:38 PM.
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Old Nov 30, 2012 | 06:49 PM
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In for answers also..got a buddy putting a 4.8 in a 68 c10 and wanting to run then saginaw
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Old Nov 30, 2012 | 07:38 PM
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I used a stock flywheel from a 4.8. A spec ls pressure plate used I bought and got a clutch to match my muncie spline count. Keisler has the bellhousing you need it has an extra hole the ls block has the bell is same as the original 621. I keeped the fork setup works fine. If you have the extra cash I would get the steel bell from quicktime bellhousing. Dont forget the pilot bearing I think it was a ls7 one p/n: 12557583.

Last edited by phasemaster1; Nov 30, 2012 at 07:48 PM.
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Old Nov 30, 2012 | 08:39 PM
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is the Muncie a m20 or m21 ?
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Old Dec 2, 2012 | 08:52 AM
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Originally Posted by KozzyJr
is the Muncie a m20 or m21 ?
I got the truck with a GM NP440 4spd manual. or it is close to Chrysler A833.

At this point im going to rebuild the NP440 and switch to a muncie later on when I find one.
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Old Dec 2, 2012 | 02:30 PM
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Originally Posted by KozzyJr
is the Muncie a m20 or m21 ?
theres also the M22 AKA the stonecrusher
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Old Dec 2, 2012 | 03:25 PM
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Originally Posted by twolow02fransen
theres also the M22 AKA the stonecrusher
yup yup but iirc its called the rock crusher.
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