identifying a four speed trans. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72slam · 01-03-2007, 05:30 PM

Can some one help me identify this tranny. I thought it was a muncie but now I don't know. It has a 10 bolt side plate and an emblem that looks like an N and a P together in the casting. Thanks

fast_dev · 01-03-2007, 05:49 PM

not a muncie, i would say a new process 4 speed. possibly the overdrive one. they work nice im told. Dev.

72slam · 01-03-2007, 05:56 PM

fast_dev,
I bought this about 10 years ago from a junk yard. They said it came out of a school bus. I had in my truck for years. If there is an overdrive in it I don't know about it. Thanks, I'm going to check on that new process.

shifty · 01-03-2007, 06:14 PM

Please read this thread:
http://67-72chevytrucks.com/vboard/s...=muncie+tranny

It will have all the info you need.

shifty · 01-03-2007, 06:18 PM

PS - it would help to remove the linkage. The easiest way to tell what it is will be to look at the shape of the side plate, count the number of bolts and compare to the PDF link given in that thread: http://go.mrgasket.com/pdf/trans_id.pdf

Looks like a T10, but which one is not clear. You will need to inspect the plate to know for sure.

Green Machine · 01-03-2007, 07:48 PM

Pretty sure that is an overdrive unit. It would be the New Process NP 440, or MY6, basicly an A833 Chrysler with overdrive. The front shift linkage is reversed. The OD trannys shift into what would be fourth on a normal tranny (direct) for third gear and then shift into "normal" 3rd position for 4th or overdrive. Easy way to tell is to turn the front shift linkage counter-clockwise to shift it and spin the front shaft. If the rear shaft turns faster than the front it is an overdrive unit. If the rear turns slower than the front it is not an overdrive unit. Hope that helps.

69_hafton · 01-03-2007, 08:34 PM

You'll need one of these (1. for manual clutch) (2. for hydraullic clutch):

69_hafton · 01-03-2007, 08:49 PM

Here's a couple more pics I stole

Other than a few extra bolt holes here and there, and an extra large shift platform/bracket, the exterior looks exactly like an a-833. I don't know if a regular 4 speed was available from New Process for Chevrolet?

72slam · 01-03-2007, 10:58 PM

Thank you everyone for the info. 69 hafton, I have a bell housing like pic 1. I didn't know they made a housing for hydraulic clutches. I plan on buying a kit that bolts to the housing to change to a hydraulic setup.
green machine, thanks for the info. I was reading an article about the upside down linkage bracket, which mine is like. I'm not sure I fully understand the shift pattern. Are you saying go from 1st to 2nd to 4th and then 3rd.? Thanks

69_hafton · 01-04-2007, 02:02 PM

The shift pattern is the same as any four speed. I believe what Green Machine is getting at is internally the 3rd & 4th gears are reversed from a normal four speed on the mainshaft (?). The front shift lever on the side cover is the 3rd & 4th lever and is inverted because of this from a normal 4 speed (like yours is). Second pic is of a normal non-OD a833 from a Chrysler vehicle.

01-03-2007, 05:30 PM	#1
72slam Registered User Join Date: Oct 2006 Location: Pennsylvania Posts: 19	identifying a four speed trans. Can some one help me identify this tranny. I thought it was a muncie but now I don't know. It has a 10 bolt side plate and an emblem that looks like an N and a P together in the casting. Thanks

01-03-2007, 05:49 PM	#2
fast_dev Registered User Join Date: Dec 2000 Location: Ringtown,PA Posts: 555	Re: identifying a four speed trans. not a muncie, i would say a new process 4 speed. possibly the overdrive one. they work nice im told. Dev. __________________ 68 chevy 406 small block, budget drag racer, new best e.t 11.91 @112 67 nova numbers matching 327 4 speed 13.6 @ 102mph 70 longhorn c-30 402/4 speed 70 c-10 swb 402, muncie 4 speed 94 s-10 350/th350 3:73 posi 71 c-20 402/th400 towrig for racetruck. 72 4wd lifted on 35's 72 350/3 speed winter beater

01-03-2007, 05:56 PM	#3
72slam Registered User Join Date: Oct 2006 Location: Pennsylvania Posts: 19	Re: identifying a four speed trans. fast_dev, I bought this about 10 years ago from a junk yard. They said it came out of a school bus. I had in my truck for years. If there is an overdrive in it I don't know about it. Thanks, I'm going to check on that new process.

01-03-2007, 06:14 PM	#4
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: identifying a four speed trans. Please read this thread: http://67-72chevytrucks.com/vboard/s...=muncie+tranny It will have all the info you need. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

01-03-2007, 06:18 PM	#5
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: identifying a four speed trans. PS - it would help to remove the linkage. The easiest way to tell what it is will be to look at the shape of the side plate, count the number of bolts and compare to the PDF link given in that thread: http://go.mrgasket.com/pdf/trans_id.pdf Looks like a T10, but which one is not clear. You will need to inspect the plate to know for sure. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

01-03-2007, 07:48 PM	#6
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: identifying a four speed trans. Pretty sure that is an overdrive unit. It would be the New Process NP 440, or MY6, basicly an A833 Chrysler with overdrive. The front shift linkage is reversed. The OD trannys shift into what would be fourth on a normal tranny (direct) for third gear and then shift into "normal" 3rd position for 4th or overdrive. Easy way to tell is to turn the front shift linkage counter-clockwise to shift it and spin the front shaft. If the rear shaft turns faster than the front it is an overdrive unit. If the rear turns slower than the front it is not an overdrive unit. Hope that helps. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 Last edited by Green Machine; 01-03-2007 at 07:52 PM.

01-03-2007, 08:34 PM	#7
69_hafton Sleep-Deprived Join Date: Sep 2002 Location: Tulsa, Oklahoma Posts: 445	Re: identifying a four speed trans. You'll need one of these (1. for manual clutch) (2. for hydraullic clutch): Attached Images __________________ 1971 K/10 Long Fleetside 350/350 - 6" Lift 1969 C/10 SWB 292 - Sold It

01-03-2007, 08:49 PM	#8
69_hafton Sleep-Deprived Join Date: Sep 2002 Location: Tulsa, Oklahoma Posts: 445	Re: identifying a four speed trans. Here's a couple more pics I stole Other than a few extra bolt holes here and there, and an extra large shift platform/bracket, the exterior looks exactly like an a-833. I don't know if a regular 4 speed was available from New Process for Chevrolet? Attached Images __________________ 1971 K/10 Long Fleetside 350/350 - 6" Lift 1969 C/10 SWB 292 - Sold It Last edited by 69_hafton; 01-03-2007 at 10:18 PM.

01-03-2007, 10:58 PM	#9
72slam Registered User Join Date: Oct 2006 Location: Pennsylvania Posts: 19	Re: identifying a four speed trans. Thank you everyone for the info. 69 hafton, I have a bell housing like pic 1. I didn't know they made a housing for hydraulic clutches. I plan on buying a kit that bolts to the housing to change to a hydraulic setup. green machine, thanks for the info. I was reading an article about the upside down linkage bracket, which mine is like. I'm not sure I fully understand the shift pattern. Are you saying go from 1st to 2nd to 4th and then 3rd.? Thanks

01-04-2007, 02:02 PM	#10
69_hafton Sleep-Deprived Join Date: Sep 2002 Location: Tulsa, Oklahoma Posts: 445	Re: identifying a four speed trans. The shift pattern is the same as any four speed. I believe what Green Machine is getting at is internally the 3rd & 4th gears are reversed from a normal four speed on the mainshaft (?). The front shift lever on the side cover is the 3rd & 4th lever and is inverted because of this from a normal 4 speed (like yours is). Second pic is of a normal non-OD a833 from a Chrysler vehicle. Attached Images __________________ 1971 K/10 Long Fleetside 350/350 - 6" Lift 1969 C/10 SWB 292 - Sold It Last edited by 69_hafton; 01-04-2007 at 02:05 PM.

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