This is an original 1967 Muncie 4 Speed M21 close ratio transmission.  These transmissions have a stellar reputation due to their tried and true performance and ease of use. The M-21 close ratio transmission has a 2.20 first gear. This transmission has the ratios between each gear closer for high performance use. If you have a 3.73 or numerically higher rearend gear, the M-21 close ratio transmission is a solid choice. These close ratio transmissions were farily rare when new and are very hard to find today. 

This M-21 transmission looks to be in good original core condition. It was recently purchased from the estate of a long time hot rodder. All gears look very nice with no chipped teeth, pitting, etc.  I see no repairs, or modifications to this transmission. All 4 mounting ears are very nice.All threads are nice with no helicoils or thread inserts. The transmission spins through all 4 forward gears and reverse. The cluster gear has a good amount of play from the front to rear that will need to be looked at. I imagine there is a bushing missing or something. The forward slider moves freely like the locks have been removed or are not working properly  This is simply a very nice original M-21 transmission that should be rebuilt before use. 

The casting number on the main case of this transmission is 3885010 as shown. The 3885010 case was used in the 1966 and 1967 model years. The assembly stamp reads P0824 which decodes as August 24th, 1966. The partial VIN of the car it was original installed in is stamped on the top of the maincase and reads "6Z101108" as shown. The tail housing has the casting number 3846429. The side cover is casting number 3831707 and the front bearing retaining carries the number 3851326 as shown. The case is bare aluminum and is free of paints and coatings with some a scatter grease/grime. This trans looks as sweet as cherry pie.

Below is a video of this transmission being shifted and spun through each gear. To watch the video on a desktop or laptop, simply click on the play icon in the photo below. To watch on a smart phone or tablet, copy and paste the link below the picture into your browser. 

This is your chance to own a very hard to find Muncie M21 close ratio 4 speed transmission for your special car or collection at a GREAT PRICE! Don't Miss Out!

Check out my other listings for more rare and hard to find parts. 

Good Luck!

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1966M214Speed x264

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