Recent Comments. Magical Muncie Four-Speed | Hotrod Hotline Availabe with either a 10 or 26 spline input. From $138.45 . For 55 and 56 the stock ratios were 3.55, 3.70, and 4.11 and for 57 they were 3.36, 3.55 and 4,11. All returns must have pre-approved RGA # within 30 days of purchase. How To Identify Chevy Four-Speed TransmissionsMuncie M21 with overdrive gears | NastyZ28.comMUNCIE M20 M21 M22 - Transmission Parts DistributorsMuncie 4-Speed Transmissions: How to Rebuild & Modify ...Pontiac Manual TransmissionsIdentifying Muncie 4-Speeds Personally, I think the angles vary from gear to gear. 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. The parts resource guide lists two major diameter drive gears: 1.76 and 1.84 inches. Additional information. close ratio 4 speed Muncie v rearend ratio | Chevy Nova Forum You can get a lot of different gear ratios if you want to rebuild a rearend. Popular Transmission Ratios - use for input below TRANSMISSION: 1ST: 2ND: 3RD: 4TH: 5TH: GM Muncie (M20) 66-74: 2.52: 1.88: 1.46: 1.00: n/a: GM Muncie (M20) 63-65 60's and 70's muscle cars and street rods. GM 4-Speed Manual - Gearvendors That was OK when gas was cheap in 1967 and you did not mind pulling 3000 RPM at 50 MPH while going to work. The Muncie M20 was a wide-ratio transmission and was intended for basic street drive-ability and basically for cruising your car . Add to Cart. Muncie cluster gear for 1963-65 (7/8" cluster pin) or 1966-74 (1" cluster pin) Muncie either M20 or M21. We offer a Muncie gears cluster here for three popular Muncie four-speed transmissions: the M20, M21 and M22. These are helpful when you are changing from one ratio to another or from M21/M20 to M22. It is available for $1200 with your choice of several different ratios. Jan 7, 2002. Ratios that were available. The SM465 can be found in Chevrolet and GMC full-size trucks, Blazers, Suburbans, among other models. Regular price $329 95 $329.95. MUNCIE MISCELLANEOUS: We have complete "in-case" gear sets available for M20 and M21. GM Chevy Pontiac Oldsmobile Buick Muncie M20 WIDE RATIO 26 SPLINE GEAR KIT. With the leverage and the gears combined with a lever action, you increase the power an engine makes. I have some dissassembly highlights in t. The Muncie 4 Speed came in 3 basic models… the M-20, M-21 & M-22. MAIN DRIVE GEAR (TEETH) MUNCIE MODEL/YEAR. The SM420 is an impressive, heavy-duty truck transmission designed for and used in ½, 3/4, 1 and 2 ton trucks. Wide Ratio. S W M p o n s o r e 3 d F W 6 I A F A. SM420. Military specification versions were made through the early 1980s. MUNCIE MISCELLANEOUS: We have complete "in-case" gear sets available for M20 and M21. With a 327, you should have more torque than my 307, and the M20/3.08 will give you a very similar 7.76 overall 1st. . In fifth gear, a 3.73:1 rear axle with a close-ratio TKO-600 would be equivalent to dropping down to a 3.06:1 rear (.81 x 3.73). The Muncie M20 is basically a wide-ratio transmission and was intended for normal street driving use. From 1963 to 1965 the close ratio M21 was ordered under the M20 RPO code and the factory decided whether to install a wide ratio M20 or close ratio M21 depending on the rear axle ratio specified. Weight. Has anyone run these together? Top Rated Seller Top Rated Seller. Muncie M20 Wide Ratio or M21 Close Ratio Gear Set. Description. 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). 4 speed shifter components diagram thumbnail b 64 arm transmission linkage muncie a e. 315 . M-20 wide ratio 71-74 . FALL SALE ON NOW!!! The 2.56:1 ratio is commonly referred to as the M20. Brand New. 0 3 S p o B D n s o r e d 5 Z 9 Y P. Muncie M20 M21 M22 Reverse and Idler Gear Set Chevy 4 Speed PRT-019 (99927)* Precision Machined. REVERSE IDLER GEAR - BUSHINGS 17T/27 SPL - MUNCIE M20, M21, M22. Muncie Transmission Information . muncie m20 gear ratios. Also M22 gear sets were of a higher nickel . You can achieve the same economy by changing your rear-end gear to a 3.08:1 ratio, using existing linkages, and simply swapping out your stock M20 gearset to an M22Z without doing any cutting. Muncie M20 Wide Ratio. The following table outlines the differences between the Muncie models. Brent,Thanks! They are compatible with a GM 3 Series differential. from United States. First the physical properties: The Muncie M20 and M21 share the SAME EXACT physical 1st, 2nd, and 3rd gears. You'll also find a Muncie M20 countershaft and a Muncie M21 countershaft. Chevrolet Muncie Transmission Parts - M20, M21, & M22. The M22 is only offered in the close-ratio option. You are getting ratios by multiplying 2 pairs of gearsets. Regular price $449 95 $449.95. All returns must be in new . The Muncie was the top high-performance manual transmission GM offered in its muscle cars of the 60s and early 70s. MUNCIE TRANS INDENTIFICATION. These M22 units are highly sought-after for performance applications. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. I don't know the weight of a J6 body/chassis but that could equally dictate your choice of transmissions. Predecessor. The Muncie M20 is basically a wide-ratio transmission and was intended for normal street driving use. From $419.00 . Muncie M20 4 Speed Gear Set Wide Ratio 26 Spline Input 1" Cluster Pin Chevy GM . 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 M20 1965-74 10 or 26 1" only 2.52 1.88 1.46 1.00 M21 1963-65 10 or 26 7/8" only 2.20 1.64 1.28 1.00 The later 1966-1974 units had a 2.52:1 first gear. GM Chevy Pontiac Oldsmobile Buick Muncie M20 WIDE RATIO 10 SPLINE GEAR KIT. Muncie main drive gear and countergear parts are easily identified when the transmission is apart. 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 at the factory in Muncie, Indiana. The reverse gears are helical cut and are located . We also have M22 Close and Wide Ratios as complete sets. The early ones had a 2.56:1 first gear. Syracuse, NY 13204 (315) 471-8141 | 1-800-634-3001 The principle of a transmission is the same. Muncie M20 Aluminum 4 Speed With 2.52 Wide Ratio Gear Set & Rebuild Kit 66-74 with 1" Pin. The numeric values between each of the 1-4 gears is subtle but in both cases wide and close ratio 4th gear is 1.00.. Part No: RSG-M21-26GK. It's equivalent to the M20 muncie with a 5.17 rear. Buy Muncie M21 Transmission Cluster Shaft 27-22-19-17 Close Ratio 66-74, WT297-8D - Shop for all your M20 M21 M22 Muncie 4 Speed Transmission Parts at Wholesale Pricing! Includes 1st gear, 2nd gear, 3rd gear, cluster & input/4th. Esssentially just the head set is ( input and front of countergear is changed). 833 Hemi 4 Speed Gear Set Dodge Mopar 2.65 Gear Ratio & 18 Spline: Includes: Cluster, Input and the 3 Speed Gears. The 2.56:1 ratio is referred to as the M20. The first models had a 2.56:1 first gear. If you examine the 1966-'70. Muncie 4 Speed M20 Gearset With 10 Spline Input. These quality M20 manual transmission parts, rebuild and overhaul kits are designed to be top of the line overhaul kits. from United States. How to Identify Muncie 4 Speed Transmissions. $39.99 to $975.00 (5 offers) - Buy Muncie M20 M21M22 3857584 Speed Tailshaft Housing 68 69 LS6 M21 M22 . Muncie M20 4 Speed (RWD) Manual Transmission Parts. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. They are for economy and street drivability and just cruising. Stock ones have limited availability of gear ratios. Muncie (General Motors) 4-speed longitudinal transmissions were developed in three distinct models - The Muncie M20 wide ratio manual transmission, the Muncie M21 close ratio manual transmission and the Muncie M22 heavy-duty close ratio manual transmission. Mpn: 3857584 Return Policy. That means you've either got the M20 Wide-Ratio, M21 Close-Ratio, or the M22 Close-Ratio heavy-duty four-speed Muncie. M22's on a 3:55 ratio with the Famous "Muncie" shifters must of been fun to drive or not,Left in the weeds probably. From $419.00 . An extra heavy duty close-ratio version (M-22) was also offered on many of the big-block high-performance models.The choice of transmission was dictated by the engine size and rear-axle ratio. The M20 Wide ratio first gear is 2:56:1, whereas the M21 close ratio trans has a 2.20:1 ratio first gear. $12.77 $16.99. That being said, there was a second, close-ratio version (M22) that was developed to survive duty behind engines with a higher torque output, and was known as the "Rock Crusher." Shown here is the M20 10-spline wide-ratio input shaft and counter gear. According to John Sawruk, the noise and/or gear whine of the old Buick brought about it's demise. The six-tooth gear (no longer available) had no driven-gear options except for one steel 20T pencil gear. 4. USA. If you want to switch tha differential gears to 3.55 then do it. C $503.68. Allstate Gear Muncie M20 M21 & M22 4 Speed Transmission Parts Shown here is the M20 10-spline wide-ratio input shaft and counter gear. B-W T85s have 22 O helix-cut gears, making them quiet as a mouse. Case casting numbers, relating production years and ratios available. Product ID. Surprisingly, a 3-speed transmission was the standard transmission for all GTO's from 1964 through 1972, although in its initial year of 1964, the 3-speed was an M12 unit made by Muncie, but after March of 1965, GTO switched to the stronger M13 Dearborn (Ford style) unit Casting: 3831704 Years: 1963 Only Ratios: M20 2.56 1st , M21 2.20 1st Casting: 3851325 Years: 1964 - 1965 Ratios: M20 2.56 1st , M21 2.20 1st Casting: 3885010 Years: 1965 - 1967 Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st The side cover has seven bolts and two shift cams. Muncie M22 Rockcrusher Close, Wide and NEW Extra-Wide (2.98) Ratio Gear Set - Italian or Korean . Individual rebuild parts are available separate from the kits. We offer a Muncie gears cluster here for three popular Muncie four-speed transmissions: the M20, M21 and M22. They are compatible with a GM 3 Series differential. You can search here, but a few comments on adapting the ST10 to a 1st gen: The M22 is only offered in the close-ratio option. Muncie M20 Wide Ratio or M21 Close Ratio Gear Set. 11322. For Models: L88, 65, 66, 67, 70 . Muncie 4 Speed M21 Gear Kit in 10 or 26 Spline Input YOU CHOOSE. Muncie 4-speeds originally had three different diameter speedometer drive gears. Muncie 3 speed transmissions Team Chevelle. March 2, 2021 Leave a comment Leave a comment The later 1966-1974 units had a 2.52:1 first gear. The Muncie M20 is basically a wide-ratio transmission and was intended for normal street driving use. Some applications beyond one-ton pickup . Muncie 4-speeds were produced in two different ratios wide-ratio (M-20) and close-ratio (M-21). The later 1966-1974 units had a 2.52:1 first gear. Muncie Transmission Information . Location: Waukesha, Wi. The final drive will be the same.. This is the way the gear ratios are listed: 1st gear 2.199:1, 2nd 1.506:1, 3rd 1.000:1 and 4th 0.859:1. I have a Muncie m20 with a first gear of 2.56 and was wondering if a 3:73 rear end would work well together? I'd definitely look into the "wide ratio" Super T10 with the 3.42 1st gear since I think it'll be a better compromise for you. We also have M22 Close and Wide Ratios as complete sets. Replaces tailhousing. A 2.56 first gear Muncie (M-20) will allow a lower numerically (3.07 for instance) geared car to move easier from a dead stop compared to the M-21 (2.20) 4 speed. YOKE, GM TH400 SLIP YOKE, T3-3-5571HP $ 154.59 Add to cart YOKE, T3R-3-9762HP, GM, TH400, 4L80E, MUNCIE, M20, M21, M22 $ 150.10 Add to cart ( OUT OF STOCK ) Chevy / Dodge 13 tooth, 38 spline transfer case speedometer drive gear COUNTERGEAR (TEETH) M20 1963-65. New Muncie M20 2.52 Wide Ratio OR M21 2.20 close ratio gear set. A M20 or M21 will work well with any ratio from around 3.23 to 4.xx A M22 works well with any ratio from around 3.73-4.xx Oct 18, 2011 #3. . Perfect Performance with 2.73 to 3.42 Rear End Gears. FALL SALE ON NOW!!! steve cooke on Muncie Super Duty M23 Super Case 4-speed Road or Drag Racing Rock-Crusher. The Muncie M20 is basically a wide-ratio transmission and was intended for normal street driving use. All wide ratio transmissions are designated M20 and close ratio transmissions are designated M21 or M22 depending on the gear set. Their case is really nice also. HOURS: Monday - Friday 8:30am - 5pm EST 530 State Fair Blvd. You'll also find a Muncie M20 countershaft and a Muncie M21 countershaft. Mark A Jones Deltona Florida on Auto Gear Super Case M22Z Rock Crusher 4-speed. I replace an Ebay purchased M22 gearset with an Autogear M22Z set. You would need at least a 4.56 rear end gear to compensate for the dead first gear. Very strong, updated design in first gear area makes these very desirable for the big engine crowd. Muncie also had a second close-ratio transmission coded M22 and known as the "rock crusher," which was used behind performance big-block engines and in some Corvettes. Gear Vendors owes a lot to the Muncie close ratio trans. a15 Mainshaft 1st Gear l36-s36t: M20/M21 (1963) 3831 743 Wt297-12 NOTE: Used WITHOUT Mainshaft 1st Gear Sleeve and WITH Mainshaft 1st Gear Thrust Washer. If you take a one-foot wrench and increase its length by two feet, it will break a tight bolt loose. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. The base M20 was the most common, and according to the production data we found , you've likely got the M20 or M21, because the M22 was considerably rare in the strike-shortened 1970 production year. We have include information on how to identify individual transmissions, application information, model year, detailed kit and part availability by transmission type. Series: Gear Ratio 1st, 2nd, 3rd, 4th: Spline Input: Grooves Input: Cluster Pin : Tooth Count Input: Tooth Count 4th Cluster: Output Spline: M-20 wide ratio 63-65 M-20 wide ratio 66-70 . Fits all Muncie applications with 1" countershaft pin, 1966-74. They are for economy and street drivability and just cruising. Aug 10, 2005 #2. Manufacturing Quality Guide to Muncie M20, M21, and M22 Four-Speed … GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones; He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963 ; Motortrend.com DA: 18 PA: 50 MOZ Rank: 70