muncie m21 compared to saginaw - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-09-2007, 02:31 PM
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muncie m21 compared to saginaw

well im down 2 saginaws in 2 weeks with my engine not even broken in, come to find out gears in all saginaws dont mesh properly and almost 1/4 of an inch of gear doesnt touch from the primary to the secondary shafts

so now i am motivated to build my muncie, all gears are good but reverse (guy threw it in reverse on the highway like an idiot ) but what is your imput on a munci m21? im not rich and its my daily driver, i just want something that will handle my 430hp sbc

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Old 07-09-2007, 02:55 PM
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They are suppose to be a tougher unit than the saginaws. But I've seen saginaws last behind strong engines with hard launches on slicks and i've seen them grenaded on a stock engine. Muncies aren't cheap anymore as they are getting harder to come by.
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Old 07-09-2007, 03:05 PM
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Muncie transmissions were stock in big block chevelle's I had one in a 375hp 396 car.- it was a m-20. the muncie's were alot stronger than the cast iron saginaw's. Just for your info, the reverse gear in most g.m. tranny's were injured in regular service, because you had to put the tranny in reverse to get the ignition key out!(and most of the people at the time were impatient!) I would question what car/truck you are putting the tranny in as to the longevity, as well as how agressive in "clutch-dumping" and "power shifting" you plan on doing (in a car that can hook up the tire enough to damage the tranny!!)
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Old 07-09-2007, 05:01 PM
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I'm running a Muncie 3-speed with Hays clutch and it's workin nice. If you're rebuilding it and it only needs a reverse gear, this should be affordable. Plus other rebuild parts

My theory........if ya already got it, why not rebuild it??? Good luck, JD
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Old 07-09-2007, 09:08 PM
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Just compare the gear widths in a Saginaw to a Muncie and you can surmise which is stronger. Almost every Muncie I have ever torn down the reverse gear and the reverse idler gear are damaged. Some still usable, but most have some damage.

Vince
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Old 07-10-2007, 12:16 AM
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well im not planning on abusing the crap out of it, i wont be dumping the clutch like an idiot, but i want it to hold up if i wanna lay a posi strip or not humiliate myself in front of a honda civic

engine
http://hotrodders.com/gallery/showph...cat/500/page/1

x tranny, notice the teath left that wernt touching the other gear(same in this one as the other one i blew up)
http://hotrodders.com/gallery/showph...cat/500/page/1

and the truck as of now
http://hotrodders.com/gallery/showph...cat/500/page/1


while i do the tranny im doing a 342 posi rear along with lowering it
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Old 07-10-2007, 07:02 AM
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First and reverse gears are constantly meshed to prevent gear damage. I always thought a Super T10 was better than a Muncie. Just my 2 cents.
http://store.summitracing.com/partde...5&autoview=sku
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Old 07-10-2007, 10:37 AM
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haha maybe if i wasnt 17 and only have a part time job i could afford that, but since i am, 200 to rebuild the munci sounds a little more in my price range
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