Part No: RSG29712A. Using GM’s existing Muncie-built SM318 three-speed manual found in Chevrolet’s passenger cars, Duntov developed a Corvette-specific variant containing 2.20:1 First, 1.32:1 Second, and 1:1 Third gear ratios. Even after 45 years, the Muncie four-speed is still a very popular transmission with Chevrolet muscle car enthusiasts, and it is easily adaptable to a wide range of GM and other non-GM vehicles. They debuted in 1963 Chevrolet full-size cars and Corvettes, and they were originally available in two ratios, 2.20:1 and 2.56:1. The M20 Wide ratio first gear is 2:56:1, whereas the M21 close ratio trans has a 2.20:1 ratio first gear. The gear ratio at this point in a M20 is 1.19 compared to 1.04 in a M21/M22. Muncie Input / Main Drive M20 M21. So how did the ratios change? Go with the M20. New Muncie M20 2.52 Wide Ratio OR M21 2.20 close ratio gear set. Gear Ratios Saginaw three-speed transmissions featured gear ratios of 2.85:1 for first, 1.68:1 for second and 1.00:1 for third when matched with L6 in-line six-cylinder engines. The M22 first gear has an angle of 14.5 degrees and the input shaft is 24.2 degrees. Brand New. These gear boxes were used when power levels exceeded the limits of the early Borg Warner T10 4 speed. Every first gear has 36 teeth, second gear has 30 teeth, and third gear has 27 teeth. M20 gets you a 2.52 1st gear compared to the 2.20 1st in the M21 (and M22) close-ratio box. I know the M21 and M22 have the same gear ratios and the M20 has steeper gears. These words are very similar for the M20 and T10 but with some slight ratio differences depending on model.All M21/22 have the same 22% upshift and 28% downshift spread as the Gear Vendors. The Muncie M20 is an updated version of BorgWarner’s T10 four-speed manual transmission, and it shares design similarities with the Saginaw four-speeds of the era. It debuted in 1963 Chevrolet full-size cars and Corvettes, and was originally available with two first-gear ratios: 2.20 to 1 and 2.56 to 1. year is the vehicle. Part No: RSG297-21AG. The Auto Gear "Thrust Button" main case, NEW SUPER STRONG yet lightweight Auto Gear Aluminum … The ratios of these pairs are identical in both transmissions. You really cannot get the early M20 and M22 mixed up because the early M20 came with a 7/8-inch countershaft, while the M22 did not. The reduction in the angle with the M22 is quite substantial. I still have the orinigal w/shop and spare parts manuals purchased when my dad bought a one tonner new in 1973 or there abouts. You must select whether you need a M20 wide or M21 close ratio & which input spline count, 10 or 26. The Muncie four-speeds are a very popular transmission with Chevrolet muscle car enthusiasts, and are easily adaptable for a wide range of GM and other non-GM vehicles. STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR SUPER CASE With The Strongest M22z ULTRAWIDE RATIO 4 SPEED TRANSMISSION. I have a 1968 Camaro with a ZZ454 crate motor, a Muncie M20 4 spd, and a 10 bolt 355 rear gear (non posi). I guess you could change gears but. You'll need that lower 1st gear with the 3.08s. I just purchased the new Tremec TKX 5 speed (that I won't see for a couple of months.....they are on backorder) and I am planning a Ford 9 inch rear with a rear gear … In fact all of the upper-speed gears have the same tooth count regardless of ratios. Click Image For More Details: 2nd Gear M20 / M21 Muncie 4 Speed. Muncie Transmission Information . However, there were several design upgrades and modifications made during the total production run. Muncie M20 M21 3rd Gear 27 Teeth 4 Speed Transmission GM Chevy 64-74 NEW 297-11. Four-speed manual transmissions were popular in … 1st gear on … I understand that the Auto Gear Supercase is thicker in this area and supposedly addresses the issue of case stretch. Availabe with either a 10 or 26 spline input. Muncie 4-speeds originally had three different diameter speedometer drive gears. I currently have a 10 bolt 8.5 with posi (posi was in there when I bought the car) and running 3.23 rear gear. Typically, the M20/M21 gearsets have a first-gear helix angle of 26.4 degrees and an input shaft angle of 39 degrees. Muncie 4-speeds have varying helix angles in the gearsets. I was told that the M20 was better for the street cause of the steeper gears, but others told me it wasn't as From $55.00 . ... Gear ratios are the same as the close-ratio M21. I had a 71 Cuda with a 4 speed and rear gears of 373 and it still was not all that good . The M20 has fewer teeth than the M21 and may be larger, but the additional torque would put more stress on the case at the front. The strongest of the "Muncie" based 4 speeds, the Auto Gear M23 is your answer for strength in those higher HP and torque applications where an M20/21 or even M22 just won't do. My Porsche runs like a scalded ape in first gear and it's overall ratio is 13.03. The SM420 was made by General Motors from 1947 to 1967. I am switching from a TH350 to a Muncie M21 Close ratio. Price: $ 129.95 A first gear that still claims fame today as the lowest first gear ever offered. 1 product rating - Muncie M20 M21 3rd Gear 27 Teeth 4 Speed Transmission GM Chevy 64-74 NEW 297-11. 8 watchers. of it with different gearing m20, m21 and m22. The six-tooth gear (no longer available) had no driven-gear options except for one steel 20T pencil gear. General Motors used the in-house Regular Production Option (RPO) code "M15" to identify the three-speed and "M20" for the four-speed. Buy It Now. in 4th on the highway. Muncie M22 26 Spline Input Close Ratio Gear Kit, GKM22A Fits GM Cars 1963-1974 with the Muncie 4 Speed 2.20 Ratio with 26 spline input shaft Fits all Muncie Transmission with 1" Cluster Pin where 1st gear rides on sleeve. How to Identify Muncie 4 Speed Transmissions. It debuted in 1963 Chevrolet full-size cars and Corvettes, and was originally available with two first-gear ratios: 2.20 to 1 and 2.56 to 1. GM Muncie SM420 Transmission. The Muncie SM465 is a heavy-duty, four-speed manual transmission built by General Motors for use in light and medium duty trucks from 1968 to 1991. Both have 1:1 final drive ratios. The Muncie’s appearance, design, and operation did not change much during the transmission’s use in GM production cars. would start with the rear end gears if they are high. Also, be sure to get a GM clutch fork for a first gen. First the physical properties: The Muncie M20 and M21 share the SAME EXACT physical 1st, 2nd, and 3rd gears. Muncie M22 3rd gear 27 tooth Italian or Korean. Includes 1st gear, 2nd gear, 3rd gear, cluster & input/4th. Ratios that were available. NEW AUTO GEAR N-SERIES ‘M20’ Four-speeds, 10 Splines in, 27 Splines out In the crate and ready to ship US $1,635 F.O.B. I got a fresh rebuilt M20 about 4 years ago for $1050 and a new hurst shifter and … .59 pilot tip and standard GM bolt pattern. In Stock. First Speed Gear Muncie M20 M21. How to Identify Muncie 4 Speed Transmissions. Input / main drive with 10 spline for Muncie M20 or M21 transmissions. Syracuse, New York. Military specification versions were made through the early 1980s. First gear is 2.52 and multiplying that by the 4.11 rear would give you 10.36 overall. The input shaft measures at 6-1/2" in length with 1-1/8" 10 spline. The Muncie four-speed was used in a wide range of GM products through the 60s and 70s. Muncie 3rd gear with 27 teeth fits all M20 & M21 muncie transmissions. 4.0 out of 5 stars. The muncie was around way back when and there were 3 versions. The new Muncies being built today have some better ratios.Today's examples of the new car gear set ups are Mustang GT's with a 3.35 1st gear and 3.08 rear. Esssentially just the head set is ( input and front of countergear is changed). It is 1965-1967 trans with 2.20/1.64/1.28/1.00 and purchasing a centerforce dual frition clutch. Ace has listed the correct gear ratios for the M20 & M21. Before calculating the driven-gear tooth count, the drive-gear tooth count must be determined. Part No: RSG297-11AG. The close ratio gear box,gives you a fairly high first gear,with the rest of the gears fairly close together,for less rpm drop on your top end. You can get a lot of different gear ratios if you want to rebuild a rearend. THE MAIN CASE IS THE STRONGEST MADE with fill and drain plugs. Very strong, updated design in first gear area makes these very desirable for the big engine crowd. There are 2 basic ratios,close and wide. Model Application Input spline Counter shaft OD 1st gear ratio 2nd gear ratio 3rd gear ratio 4th gear M20 1963-65 10 7/8” only 2.56 1.91 1.48 1.00 Overdrive … Continue reading GM 4-Speed Manual → I am putting in a big block with a Muncie M21. In Stock. I have a '69 Z28 with 3.73 rear and a wide ratio Muncie, and it is barely able to accelerate from a stop without revving up to near 3000 rpm. It was actually based on the T-10 design and uses the same basic gear layout. $65.50. The Muncie four speed was produced in two ratios: the wide ratio (M20) and the close-ratio (M21). The Muncie 4 speed,was first designed in 1963,and lasted until 1974. The SM465 can be found in Chevrolet and GMC full-size trucks, Blazers, Suburbans, among other models.Some applications beyond one-ton pickup trucks came with larger input shafts. Notice the different helix angles of the gears. 3rd gear with 27 teeth for all Muncie M22 close ratio transmissions. Muncie 4 speed transmissions were used in General Motors cars from 1963 to early 1975. Even after 45 years, the Muncie four-speed is still a very popular transmission with Chevrolet muscle car enthusiasts, and it is easily adaptable to a wide range of GM and other non-GM vehicles. From $87.60 . C355 Forged Aluminum Mid … You are getting ratios by multiplying 2 pairs of gearsets. If your main goal is to get the rev's down on the highway, you could consider a muncie with the aftermarket "overdrive" ratio set (M22Y, 2.20, 1.51, 1.00, 0.859). Last one. I was told that the trans would not be a good street trans unless I went with steep gears in the rear. A GREAT HEAVY DUTY ROCKCRUSHER FOR YOUR CAMARO, NOVA, CHEVELLE, CORVETTE, GTO,442. The cast iron case measures at 10 1/2" length, the transmission top cover is also cast iron and is attached via 8 bolts.

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