It`s not a muncie.. its siginaw.. 4 speed - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-02-2006, 06:33 PM
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It`s not a muncie.. its siginaw.. 4 speed

need help finding gear ratios for this tranny. here are the tranny side case numbers #3925660

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Old 07-02-2006, 11:53 PM
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how many rings does it have
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Old 07-03-2006, 01:08 AM
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Count the annular rings, if any, around the splined area on the input shaft. Should be anywhere between none and 3. Take that number to the site below for ID info.

http://www.dandltransmission.com/saginaw.html
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Old 07-03-2006, 08:33 AM
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Muncie

That number you listed is for a 68/69 muncie.... Why do you think the transmission "is-not" a muncie????
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Old 07-03-2006, 06:11 PM
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that is a muncie casting code

lol

http://www3.sympatico.ca/atkinsom/history.html

http://www.5speeds.com/muncie2.htm

Last edited by fast68; 07-03-2006 at 06:24 PM.
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Old 07-03-2006, 07:38 PM
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thank yall it is a muncie, i got some misleading info on the tranny off the internet.

i got misleading pics and names for identifying the trannies. But as i`ve said in some engine forums before. The PAW book is very usefull i identified it now i`m gonna check the ratios it came with. oh and by the way; i removed the side cover seeing as how it had some permatex oozing off the gasket. i Noticed the sincro`s are brand new. good find i guess.
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Old 07-03-2006, 07:48 PM
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muncie m-20

muncie m-20. gears is what i come up with. the input has two rings.
Year 1966-1974 Type: M20 Rings: Two Ratio: 2.52 / 1.88 / 1.46 / 1.00 / 3.11


i apreciate the advise and the link gotta add it to favorites.
how much does one of these go for? i`m just kinda wondering even though not thinking of selling it anytime soon.
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Old 07-03-2006, 08:01 PM
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questions for rear end with m-20 tranny in truck.

is the m-20 transmission good with 31`s or should i move to a smaller tire size?... the truck has a stock 2.70 12 bolt. or at least i think i`m in the ball park of the ratio. if it`s not a good ratio. should i change it. i`m thinking of more of a 3.42 or a 3.73.
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Old 07-04-2006, 11:34 PM
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My Nova used to have a 2.54 low gear, 25.5" tires, and a 3.08 gear. It was a major pain to get it moving from a dead stop. I had to slip the clutch so much that it would wear out in ~20,000 miles.
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Old 07-05-2006, 09:39 PM
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rpm-age" gearing so to speak of" :P

so in other words a 3.73 will do me a real good deal. or would 4-11 be too much to ask? what if i were to add some 33`s. according to the rpm calculator a 3.55 is a good start with stock sized tires and the muncie m-20 gear the 2.52 first gear. 1.88 second.. but seeing as how i`m running 31s and i might step up to 33s or down to a fatty wide tread tires.maybe a 29 if i had to. what would be yalls suggestions on this matter.
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Old 07-05-2006, 11:36 PM
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My Nova now has the 3.11 Saginaw and 3.08's, so the final ratio in low gear is 3.11 x 3.08 = 9.58, and it still has the 25.5" tires. Before, low gear was 2.54, so the total was 7.82, and it was a real pain to get it moving. Add the effect of the larger 31" tires, and the effective ratio would be 6.44. That's not a whole lot better than starting off in 2nd gear.

Using 2.52 low, 31" tires, & 3.73 gears, and you're at 7.73, which would also be a pain to get moving. Change to 4.11, and you're at 8.52, which would still be unacceptable to me, but you might be OK with it.
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Old 07-06-2006, 01:28 AM
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m20 goes 4

Quote:
Originally Posted by 74chevyflat
muncie m-20. gears is what i come up with. the input has two rings.
Year 1966-1974 Type: M20 Rings: Two Ratio: 2.52 / 1.88 / 1.46 / 1.00 / 3.11


i apreciate the advise and the link gotta add it to favorites.
how much does one of these go for? i`m just kinda wondering even though not thinking of selling it anytime soon.
i just rebuilt my m 20 and all new parts except the reverse gear was 800 bucks and on my time to do the build i would have to sell it for around 1100
i seen trannys for 1400 with core and at some swaps i found good rebuildable trans around 400-600 with shifter linkage
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Old 07-10-2006, 09:44 AM
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update on muncie install

well i finally got the tranny in i had to upsize the mount bolts. i used some heli-coils. they came very handy. well i got it running shifts fin only thing is that it doesn`t like down shifting at all in second. it popped out a couple times. truck feel totally different. it`s a Bi*ch to get rolling though. but once it moving it`s fine. went throught 2nd and 3rd very quickly. it seems like the same gear in my book. very wide from 1st to 2nd. didn`t go past 3000rpm and it chirped second and i didn`t pop the clutch after raising rpms. did a rolling start on a stretch of road estimated at 1/4 mile. ran about 75 mph at the end of it i let out at about midway 4th. i like it. ALOTT

let yall know what happens when the 250 l6 is changed out or beefed up a bit. don`t know yet seems fine to me. for what it is.
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