muncie 4 speed schematic

. (The M does not stand for "Muncie.") Typically, when you ordered a GM car you had standard options and accessories installed. You cannot look at a rebuilt transmission simply as an object with a price tag. shifter shaft I usually stack second gear, first gear, and the 1-2 synchro assembly together and stack third gear and the 3-4 synchro assembly together. Pry near the dowel to remove the cover. The key difference between. This application uses a thin rib. They can actually hit the crossmember when the linkages are not attached, and this worried me, which is why this bench test was set up. Focus on getting all the gears removed and then disassemble the sidecover and extension housing. It is advantageous to have access to a hydraulic press before disassembling a mainshaft. Most passenger car plants stamped the VIN on the top, while other plants stamped it on the side, near the assembly date code. This application uses a wide rib. Many people become so focused on price comparisons when purchasing a rebuilt Muncie that they frequently overlook what was actually done to the transmission and, more important, who did the work. Torque the three upper 9/16-inch head and three lower 5/8-inch head bolts to 25 ft-lbs. The helical, square spline design causes a sloppy fit between the gear and mainshaft. gear bearing Then, take your snap ring pliers and . 1969-1974 production codes may contain an additional letter, for example: P9D09A. Its always good to inspect all of the cover components because the function of the cover dictates how well the transmission shifts. Save your vehicles, create project lists, and track your orders. The seal presses against a step within the bore. This chart should help with Muncie identification. Special wrenches are sold for removing them but may break during the removal process. Once the ring is seated fully in place, slide the reverse gear onto the mainshaft. Second gear is supporting the geartrain during this mainshaft press procedure. Transmission Stay up-to-date on our special promotions and deals. The 1964 maincase casting number was #3851325 and was used through the 1965 model year as well. 1st & 2nd, 36) Ring, 1st & 2nd Invest in the proper thread repair kits and seek out quality weld repair work if it becomes necessary. hT1O0ol\|:#10P,t45 u"@o]Ive"3-BCU_DWJMU^%{_B$F#UBK+%X.:5ss:azvc88,5n(.K}' _)qYeb-UP7 I You can use a chisel to easily remove them. 1. \;1"89ek5YAwG Rv($|)d Here is the result of our rebuild. 3rd & 4th, 26) Ring, 3rd & Use a soft iron hammer on the pin to knock the input shaft through the bearing. It is importing to understand that most all Chevrolet parts have some kind of date coding cast or stamped into the part. I run the actual countershaft that I will use through the countergear outside the transmission so that I can feel for any high spots, possible binding, or a bent shaft. Longitudinal transmissions [ edit] Aisin AR5/MA5 5-speed longitudinal manual made by Aisin. - rear, 54) Extension Most of the Build Date Codes will precede the build date of the car by approximately two weeks to 90 days. Loading all needle bearings is the job everyone hates because its tedious work. 159 0 obj <>stream %%EOF & Place third gear and its synchro ring on the mainshaft. The next step is to drop in the reverse idler. It can be acceptable for the Status Marker circle to be blank. 4th Synchronizer Once clamped, the 51813 Permatex sets up within 15 minutes. Use a 9/16 socket and torque the four bolts to 25 ft-lbs. 4.054 Neutral Start Switch. Some people never disassemble the sidecover when doing a rebuild. These grooves were cut into the input shaft so the Muncie assembly line worker could easily identify which input shaft should be installed in a particular unit. ), 72) Pin, Reverse The location of the VIN stamp can vary but it can usually be found on the top leading edge of the main case or on a mounting surface near the Build Date Code. This is not model or year specific. The letter M was used to ID the Muncie plant for the Muncie 3 speed, so P was the next logical letter. lever to shaft Shifter lever to Shifter lever to For 1965 and newer Corvettes the first character was the letter "S," which was the designation for the St. Louis assembly plant. =7r+`d,v8rG(Kw^\S<>>oooawW,"gf :u# R The following six digits were the last six digits of the VIN. We provide parts in three separate categories for the Muncie M20 4 Speed: Overhaul kits by application include standard kits, heavy duty kits for more horsepower and "WS" kits that include both bearings and syncro rings as well as gaskets and seal s. IDENTIFICATION - CHEVROLET 4spd, RWD, M20, Muncie, aluminum case, 7 bolt side cover 28) Gear, Transmission 2nd Speed. Always reinstall the spring facing in this direction. Start by using plenty of grease and insert the spacer tube. Transmission 1st & retainer snap, 43) Gear, QQtx:ES~U*T.Ly&(6*'? 7s Muncie manual trans. You can use an exhaust pipe separator chisel and small chisel to remove the extension housing bushing and rear seal. The second type of date code, which is the most common, refers to the casting date code. 1956-1964 4 speed Controlled coupling HydraMatic, also known as Cadillac 315 or P 315 HydraMatic, Oldsmobile Jetaway, Pontiac Super HydraMatic. Sales & Service Teams now available 7 days a week! 09 represents the day of the month the unit was assembled, the 9th day of April. Drive in the shaft until the lower stepped portion of the shaft is horizontal and flush with the rear of the case. Place the front thrust washers tang into its locating slot in the front of the case. MUNCIE 4-SPEED MANUAL TRANSMISSION ASSEMBLIES, GEARS & PARTS APPLICATIONS: GENERAL MOTORS 1963-1974 GENERAL MOTORS (HIGH PERFORMANCE) AUTO GEAR EQUIPMENT 530 State Fair Boulevard, Syracuse, New York 13204 (800) 634-3001, Inside New York: (315) 471-8141 Here, Im using a block of wood. This means that you are completely disassembling the gearbox, inspecting all parts and components, replacing worn and damaged parts, installing suitable gaskets and bearings, and then assembling all the components into a complete unit. Put your other hand over the C-clip to catch it once it clears the cam. The opposite side of the date marker has between one and five dots, representing the week of the month. Make sure the backside of the teeth faces the thrust washer. Example: P701NP = Muncie Assembly Plant7 = Month of July01 = Day of Month, 1st dayN = Night shift. The SM420 was made by General Motors from 1947 to 1967. Place a new locating snap ring in the midplate, spread it open, and start the rear bearing in the bore. I like to use lock washers even though the factory never used them. Thats the type of transmission I used for this build. Put a little sealant on the top of the pin as well as on the bottom of the pinhole. A Dremel or rotary tool is helpful for deburring gears. Start by placing the 1-2 shifter shaft in the second-gear position. Main shaft rear, 42) Ring, Main You can use a pipe wrench if you are careful. Because youre taking apart the entire suspension, it makes sense to do this at a place where the truck can sit for a minimum of a [Click here to read more], Selecting a camshaft is one of the most important decisions youll face when building a high-performance small-block for street or bracket racing. - front, 17) Gear, I always grind a 45-degree chamfer into the front of the forward reverse-idler teeth because some sliders hit them when in first gear. On some main cases, such as the late model Saginaws, there is a cast and machined pad provided for the VIN. fits all muncie m20, m21, & m22 models; includes gaskets, & seals; also includes smaller bearing retainer gasket for some very early units with smaller retainer; One circle is the Date Marker and the other circle is referred to as the Status Marker. The 1965 Muncie was identical to the 1964 version. [4Uvo*=+3Ume _K^[\9uWl;w3Sm?kw3P/}cWPpn-%PGRJo !Z)qNTEG "sds=6l;SG2d3U"))EIjy+}GJL You can place the case subassembly facing down on an old case or bellhousing. Remove the input-shaft bearing cage and lift out the 17 needles. Reverse idler cam retainer Once I fully chamfer and deburr the gear, I install the forward reverse-idler thrust washer and hold it in place with grease. part #342864 $299.00. Light tapping should drive the bearing out of the bore. The early #3846429 extension has the casting numbers cast directly into the part. buy 4 - 4 and get 15% off buy 5 or above and get 20% off . 146 0 obj <> endobj Grease the rear seal and coat the outside of the seal with Permatex 51813. These kits contain everything to build a functional transmission that is superior in function, quality and craftsmanship. MUNCIE 4 SPEED ALUMINUM TRANSMISSION COMPONENT CASTING NUMBER CHART. clutch, 18) Bearing assy., I tracked down the original OEM parts that I thought would make a great kit and started selling them to the public at car shows. Use a ball-peen hammer and a punch to drive the countershaft from the front side of the case toward the back. Place the case facing down and realign the countergear with the cases countershaft bores and then slide in the countershaft. The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. At this point, the geartrain is completely apart. The original design retainer was manufactured out of aluminum, but the later replacement retainers were made out of cast iron. Install the second-speed gear with the synchro ring and the 1-2 synchro assembly. Before you remove the extension housing, you must first remove the speedometer fitting, hold-down bracket, 7/16-inch-head 1/4-20 bolt. Reply. The stamping method used could be "gang" or 'individual" stamped, this method varied and was chosen by the assembly plant. Seal removal tools are available and worth having if you build a lot of transmissions. Notice the way Im gripping the punch while tapping the bearing. Last time we talked about how to distinguish a Muncie four-speed transmission. I typically replace the forks because most are worn, and they are just too old. hb```d``rd`f``h`b@ !3G* I want the load to be even around the whole circumference of the tailhousing. (7/16"- 14x1-7/8"), 58) Gear, I use the case to support the cover when I press in the sidecover seals with a 17-mm socket. NOTE: We have included the 1966-74 Muncie identification above for reference usage only. The 1964 Muncie transmission was a basic carryover of the 1963 transmission with the exception of the 1964 and later gearboxes used a first gear sleeve on the main shaft for better lubrication. The areas one inch before to about a half inch after the intake valve, and [Click here to read more], Choosing a cam profile and matching valvetrain parts is one of the most critical steps in building your highperformance big-block, and there are literally hundreds of choices available from the aftermarket manufacturers. 2. 2nd 3rd & 4th The most frequently replaced hard parts are shift forks, sliders, and the front retainer. These codes can be difficult to read on some units and are comprised of two circles that are divided into two halves. Multiple ratios, Heavy Duty case, center plate and tail. TempestTorque, ( Pontiac) a two speed based on Powerglide, but having the added feature of " Split Torque " dividing the engine power between mechanical connection and the torque converter in high gear. Reverse idler front Its best to position the reverse arm midway. synchronizer If you are replacing the front retainer, make sure your old bolts are long enough because newer retainers may be thicker. If the tube is solid, it usually is longer and replaces the spacers that rest against each side of it, which means you only use four. The most common small repair is to change the front bearing retainer. Some sliders are very loose and can drop off the hub. The 1963 transmission had a smaller front input shaft bearing and a specific front bearing retainer with a smaller outside diameter than the Muncie transmissions from 1964 and up. No 1963 or 1964 maincase should have a drain plug in the case. They have no moving parts and merely have to connect the carburetor or throttle body with the intake ports. These rings were put on for the Muncie assembly line workers to readily identify which input shaft they had to install. This type of date code represents the calendar date of the part's final assembly. (Part of #25-35), 48) Washer, Step 2: Remove Sidecover The sidecover alignment dowel is located below the upper right bolt. 4th Synchronizer Often this circle is blank. Quality parts guaranteed! (1/4"x 1-1/2"), 75) Shaft assy., One circle is called the date marker, the other the status marker. Obviously, those are easily removed. (Please refer to the component casting chart and the location of the transmission build date to determine the correct model year and application for the part.) blocking, 30) Spring, 1st & You will disassemble it later. Thanks Dad! The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. bearing, 8) Bolt, Bearing Reverse idler rear Steel gears should always replace the plastic gears. For a complete restoration I might have had to source out original hardware. Trans. If the combs are bent they do not run along each other smoothly. The Muncie four-speed, like the T-10, is a side-loading transmission. Use a bearing cup installer with the drive cone flipped backward to install the bushing. Placing it forward makes it easy to attach the fork to the reverse gear. General Motors decided to develop a 4-speed in-house to eliminate dependency on the T-10. - 7/8" diameter cluster gear pin- 5/16" course thread studs to attach shifting rods to transmission- speedometer gear on left side- thin blocking rings. Here is what a complete Muncie shifter looks like.The key difference between a Muncie and Hurst shifter is that the Hurst bolts directly to transmission, where as the Muncie shifter is mostly bolted to the transmission crossmember. 1st, 2nd, 3rd, 4th, 78) Belt, Cover to Transmission 3rd Speed. Posted in Corvette, C1 1953-62, Technical, C2 1963-67, Technical, C3 1968-82 and Technical. Speedometer drive If you have a split-seam tube always use six needle spacers. Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown) Main shaft front, 19) Ring, 3rd & 4th Installing the Engine On most other components it is common for the letter "I" not to be used because it is easy to confuse it with the number "1.". Synchronizer, 35) Synchronizer These have a tendency to fly off the cover and get lost. case (5/16"int. Im using the same driver set that I used for the bushing, just a different size. Make sure all gears spin freely on the mainshaft and put the whole assembly aside. We offer many high quality Muncie 4 speeds for your 60's to mid 70's GM car. The main case date code is usually found on the passenger side of the case just below the casting number. The original ring groove for each transmission is shown below in the following charts. MIDWEST MUNCIE Specializes in ONLY MUNCIE 4-SPEEDS unlike any other transmission builder and has been specializing in restoration and building of Muncie 4 speeds since 1976. Bearing retainer to 04 represents the month code when the unit was assembled, April. (5/16"-18x3/4"), 79) Washer, However, the Corvette assembly plant in St. Louis from 1962-1964 was relatively consistent. The orientation of these parts is critical. extension Its a good idea to clean up the edges with a file and check your clearances with a yoke before final assembly. OE Replacements. Fit the thickest ring you can into the groove using snap-ring pliers. Countershaft endstream endobj 1 0 obj <> endobj 2 0 obj <>stream idler shaft lock Grinding tends to create burrs on the gears so I use a bench grinder and then clean up the edges with a flexible shaft. Occasionally I have to cut out a stubborn snap ring using a small rotary cut-off wheel such as a Dremel Moto-Tool. Position the nut with the tapered side facing forward. (Cheap light-duty wrenches are good for only one or two uses.) 4. A third variant was the light-duty rear wheel drive Turbo-Hydramatic 180 used in many European models. l)3:9(kW7x M,]Ff2 The first documented Corvettes with the Muncie transmission appear in the May-June time frame. Tilt the top of the cover down and catch the upper parts of both shift forks in their respective sliders first, then lower the cover into place.

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