Call us to . M-21 close ratio 63-65 . 1969 Muncie 3-speed B = 2.42 first gear ratio 1969 Muncie 4 speed only: A = M20 B = M21 Use of the Muncie type suffix C = M22 began with 21 Oct 68 production. Muncie 4 speed question | Chevy Nova Forum Muncie 3 speed trans | Hot Rod Forum PDF 3 Speed Chevy Manual Transmission Diagram They are for economy and street drivability and just cruising. Military specification versions were made through the early 1980s. Notice that the Muncie synchro cone is larger in diameter for improved stopping power. TM TRANSMISSION RATIO MASTER DRIVE SET 22/37 27/31 DRIVE RATIO 1.682 1.148 GEAR TOOTHSET MAINSHAFTCLUSTER RATIO COUNTRATIOGEAR GEAR 42/162.6251071842 4.41 3.011551516 1st 41/172.4121071841 4.06 2.771551517 39/201.950 1071839 1551820 3.28 2.24 Motorsports | Custom Gearboxes | Muncie | Autogear . The countergear has 17 teeth on its first-gear section driving the actual first-speed gear with 36 teeth. Muncie 3 speed | Hot Rod Forum Muncie 3 speed transmissions | Team Chevelle 92-94 - NVG T550 5 speed. These light duty Muncie model Model 318 and 319 transmission were used in early Chevrolet Bel Air, Biscayne, Impala, Chevelle, El Camino, Malibu, Corvette, Nova, Chevy II and Pickup Trucks and Van's. GMC Pickup Trucks and Van's . The maindrive gear on the left is from a T85 3-speed. Muncie M22 10 Spline Input Wide Ratio Gear Kit, GKM22W-10 Ratio 2.52 Fits GM Cars 1963-1974 with the Muncie 4 Speed Guaranteed lowest price! New OEM AC Delco gears are used in Muncie, GM T10, GM Super T10, Saginaw 3 & 4 speed, GM T5, Powerglide, 200 & 350 transmissions. GM 4-Speed Manual Transmission Trucks. Donnie, the first order of business is to decide which Muncie you are going to run. Muncie SM 318 (sm318) 3 speed Transmissions All ... The Muncie was the top high-performance manual transmission GM offered in its muscle cars of the 60s and early 70s. ZR1's with a 2.68 1st gear, 3.54 rear gear and a .59 overdrive. From $55.00 . Must weight at least 25lbs more than the saginaw.. MUNCIE 3-SPEEDS (CAST IRON) 0 LINE INPUT -3.00/1.75/1.00. The Novak Guide to the GM Muncie SM420 Transmission I tried a 3-speed muncie with a Borg Warner overdrive unit on the back and though it did reduce the rpm, I didn't like the free-wheeling design of the gears so that when you decelerate, the transmission isn't . It is driven by the input shaft with 21 teeth. Auto Gear Super Case M22Z Rock Crusher 4-speed. Perfect ... Muncie 4-speed Transmission (Group 4.000) -. The 700R4 has gear ratios of: 3.06, 1.63, 1.00 and .70. . & Dodge Truck TREMEC 3550 (469) 4-SPEED TRANSMISSION I.D. M23/N24 Ratios. The M22 was produced in 1973 and 1974 for other GM divisions. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. 1 LINE INPUT - 2.41/1.57/1.00. Ratios of the M20, M21, M22. New Camaros with a 2.68 1st gear, 3.73 rear gear and .59 overdrive. the sm 318 has a shorter mainshaft. The letter O would add confusion since it resembles zero. The early ones had a 2.56:1 first gear. 3-speed. 2nd gear with 30 teeth for all Muncie M22 close ratio transmissions. Muncie M22 3rd gear 27 tooth Italian or Korean. Joe Gio on Muncie Super Duty M23 Super Case 4-speed Road or Drag Racing Rock-Crusher. Most 3- and 4-speed transmissions of the muscle car era used helical gears for quiet, efficient operation. In this case you get 19 or 20 (depending on how you "round" the answer): (7 x 3.73 x 747) ÷ 1001 = 19.48 The later 1966-1974 units had a 2.52:1 first gear. (1) All M22 applications except 454 engine. They are compatible with a GM 3 Series differential. STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR SUPER CASE With The Strongest M22z ULTRAWIDE RATIO 4 SPEED TRANSMISSION. The new base transmission was a Muncie heavy-duty 3-speed manual transmission that was related to the Muncie 4speeds. The 2.20:1 ratio first gear is usually referred to as the Muncie M21 transmission; based on GM's production codes. Muncie M62/M64 — 3-speed longitudinal transmission made by GM; Muncie SM420 — 4-speed manual used up to 1967, very similar to sm 465 except small changes to gear ratios and location of reverse. The later 1966-1974 units had a 2.52:1 first gear. Tickets Heute Reduziert, Sichern Sie Ihre Sitzplätze, Deutschland Tickets 202 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 .M-20 wide ratio 71-74 . 2" shorter case Reduced rotating weight Raised bottom for ground clearance Shorter shift pattern (no levers or cams) A variety of gear ratios are available, ideal for Late Model, Super Late Model and Pro Late Model racing. 3.1L Engine. If you've got a manual transmission, we're assuming it's a four speed, because (from what we can tell) Chevy dropped the base manual 3-speed after 1969. The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. So, if you have an eight-tooth drive gear and use the above equation with an axle ratio of 3.73:1 you get 22: If you use a large-diameter eight-tooth gear, you may want to switch to a seven-tooth gear. It has a granny low and so then just 3 normally usable ratios. The M21 & M22 is a four speed, RWD or 4WD transmission. My '51 now has a '59 3 speed O.D. The SM420 is an impressive, heavy-duty truck transmission designed for and used in ½, 3/4, 1 and 2 ton trucks. How do I know what Muncie 4 speed I have? The 2.56:1 ratio is referred to as the M20. Buy Richmond Gear 1304000071 at JEGS: Richmond Gear GM Super T-10 4-Speed Transmission First to Fourth: 3.42, 2.28, 1.46, 1.00 (3.51 Reverse). Muncie 4 speed manual transmissions. As far as i know the trucks(I6 & v8 sb ) had a 2.85 gear. This transmission is found in performance applications. Muncie 3rd gear with 27 teeth fits all M20 & M21 muncie transmissions. M-21 close ratio 63-65 . It has a granny low and so then just 3 normally usable ratios. (2) All 454 Chevelle applications. IDENTIFICATION - 330 3spd, RWD or 4WD, HD Muncie Cast Iron case and extension housing with 11" case and 7-bolt side cover. 1 - 4 of 4 Posts. 2nd Gear. Serial numbers for Muncie 4 speeds always begin with the letter "P". Plug the tooth counts into the above formula and you get a first-gear ratio of 2.52:1. 3831704 1963 7/8-inch cluster, small bearing. The Saginaw is often mistaken for a Muncie. CHART 5-SPEED TRANSMISSION I.D. From $93.70 . 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 casting number 3925660 denotes this as a 1968 - 1970 Muncie with a 1-inch cluster shaft. 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 . THE MAIN CASE IS THE STRONGEST MADE with fill and drain plugs. some of the BB stick trucks were listed with a 2.52 gear(not a saginaw, but a muncie trans). Transmission Gear Ratios. 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. The Muncie 465 is a great transmission from a durability standpoint, but it is the widest ratio 4-speed of the Big Three. The Muncie also has a 7 bolt side cover; however, the Muncie reverse lever is found in the extension housing and features an aluminum case. Muncie 330 (3 Speed (Rwd), Bearing Kit [CT-BK289] - $173.99 : Automatic, Standard Transmission and Transfer Case Rebuild Kits, Cobra Transmission Parts 1-800-293-1848, Cobra Transmission. Muncie 4 Speed Parts and Upgrades Italian gears, SuperCase and more Auto Gear Direct Preferred pricing for you Warner Gear and Tremec 5/6 Speed Parts OEM parts for T5, T56, 6060 and TKO 3rd gear with 27 teeth for all Muncie M22 close ratio transmissions. Mark A Jones Deltona Florida on Auto Gear Super Case M22Z Rock Crusher 4-speed. How to for street, dirt track racing and drag racing. GM Muncie SM420 Transmission. 4th Gear. the sm 318 has a shorter mainshaft. To get the best of both worlds, you really need something with a wider ratio spread. Click the link! Please consider creating a new thread. The basic design and operation theory of the gearbox changed little during that time, though several design upgrades and modifications were made during the total production run. All mine have M-20s - the best Muncie if you ask me. Recent Comments. I did a little research and believe the old short tail, non synchro 3-Speeds are Muncie SM 318's. Muncie also had a second close-ratio transmission called an M22, which enthusiasts christened Rockcrusher; this was used in performance big-block engines and Corvettes and is a highly sought-after performance transmission today, and is the heavy-duty version of the 2.20 ratio M21 4-speed. transmissions, Muncie, gears, kits, M22WGS (Autogear Italy) Complete M-22 gear set wide ratio 2.56 1st, 1.75 2nd, 1.36 3rd The early ones had a 2.56:1 first gear. The 1971 transmissions were the same as from previous year, except that the M-21 close-ratio 4-speed transmission was replaced with a stronger version of the Mun­cie close-ratio gearbox the famous M-22 "Rock Crusher" 4-speed. tranny, same 2:94 1st gear. This transmission is found in performance applications. Of course, rodders get a little creative. Transmission Gear Ratio Chart ~ Gear Ratios are listed for many popular transmissions. P stands for Muncie Plant. To view links or images in signatures your post count must be 0 or greater. Muncie 3rd Gear 27 Tooth Auto Gear Italian or South Korean Made. AG Roller… On a scale of 1-10, with "7" being a Muncie M22, the Heavy-Duty B-O-P selector is rated as an "8". Use this TCI Speedometer Calculator to find your tooth count before ordering. Magnesium case is now available. 833 Hemi 4 Speed Gear Set Dodge Mopar 2.65 Gear Ratio & 18 Spline: Includes: Cluster, Input and the 3 Speed Gears. M22 Ratios. You better have a clutch in great shape for 3.07 or lower numerically or it will chatter badly. Overdrive … Continue reading GM 4-Speed Manual → The Muncie M21 is a close-ratio unit originally designed to be matched with 4.11:1 or 4.56:1 GM 4 Series differentials. Manual 3-Speed Transmission Ratios Engine & Drivetrain. HM-282 (Muncie/Getrag) (RPO: MG2) and NVT 550 (New Venture) 5 speed. The Muncie 4 Speed came in 3 basic models… the M-20, M-21 & M-22. Muncie 3 speed transmission gear ratios. If you're undertaking a Muncie transmission T10 speedometer gear replacement or need a T5 speedometer drive gear for a repair job, we've got a full line of quality pencil speedometer gears and speedo accessory parts here, custom manufactured by Transolutions and ready for immediate delivery (usually shipped within 24 to 48 hours). C355 Forged Aluminum Mid-Plate. Casting Numbers. The additional letter codes as follows: Muncie 3 speed Manual. The Muncie 4-speeds, M20, M21, and M22 are some of the most popular manual transmissions ever made and continue to be incredibly popular. The first models had a 2.56:1 first gear. The heavy-duty trans is easily distinguished by it's large physical size and 6-bolt top cover. Muncie 4-speeds were produced in two different ratios wide-ratio (M-20) and close-ratio (M-21). The tranny and bell are from a 1959 Impala, the engine is a 1961 235. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963 . M21 Muncie Four-Speed Transmission - $800 (Grass Valley) M21 Muncie Four-Speed TransmissionGM Muncie M21 Muncie 4-Speed TransmissionRemoved from a 1966 Corvette 427 when the numbers matching M22 transmission was found. 1st Gear (1) 311. The Muncie 465 is a great transmission from a durability standpoint, but it is the widest ratio 4-speed of the Big Three. Beginning in 1968, the car's last eight numbers of the VIN were stamped on the transmission. Muncie Parts List: Four Speed Transmission- All wide ratio transmissions are designated M20 and close ratio transmissions are designated M21 or M22 depending on the gear set. The letter M was used to ID the Muncie plant for the Muncie 3 speed, so P was the next logical letter. Muncie 4 speed manual transmissions. GM 4, 5 & 6 - Speed Manual Transmissions. All of these gears have the same number of clutch teeth: 36. Each new Auto Gear transmission is built from genuine Auto Gear parts, the highest quality available. This is an older thread, you may not receive a response, and could be reviving an old thread. Serial Number: D132789Casing: 3 . This is the only GM 3 speed with the same bearing front and rear. Technical specifications. The Muncie M20 was a wide-ratio transmission and was intended for basic street drive-ability and basically for cruising your car . th350 , 2-speed powerglide automatic, super t10, muncie m20 m21 m22, saginaw, & t5 manual transmission speedometer gear 18t brown fits gm (3987918)(8g-18a) TPD PRO-LINE $12.77 $16.99 3rd Gear. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. General Motors' M22 Muncie 4-speed was the first semi-helical gearbox offered in a passenger car. Class. Yeah, you could drop the $$$ on something like a TKO600 with a spread of 2.87/0.64 == 4.48, but cheaper would be to pick up a Super T-10 "wide-ratio" setup with the 3.42 1st and 1:1 4th gear (3.42 spread). Muncie 3 Speed: A=3.03:1 B=2.42:1 Muncie 4 Speed: A=2.52:1 Wide Range B=2.2:1 Close Range C=2.2:1 Rock Crusher. Furthermore, the Chevrolet 3-speed manual didn't have ideal ratios for a sports car, with a 2.94:1 first and a 1.68:1 second gear ratios. Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. The reverse gears are helical cut and are located . Now coded as MC1 (not M13), it was offered with 2 different ratio sets. steve cooke on Muncie Super Duty M23 Super Case 4-speed Road or Drag Racing Rock-Crusher. They are for economy and street drivability and just cruising. They are compatible with a GM 3 Series differential. 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