Thanks Dad! retainer to case This means that you should also replace the cover. The Status Marker information was used by the Muncie plant to help track a problem part. Placing it forward makes it easy to attach the fork to the reverse gear. - rear, 51) Washer, endstream endobj 147 0 obj <> endobj 148 0 obj <> endobj 149 0 obj <>stream Install the tailhousing bolts. Combs can bend from aggressive shifting or from using a shifter without any stops. retainer snap, 43) Gear, Sometimes you can pry on this and remove the bearing. *1sQawB5BNxenlVyM0*3R ,&#]Djmyp The lower part of the Status Marker circle will contain a letter to note any deviations notice. To start the mainshaft disassembly, use snap-ring pliers to remove the 3-4 synchronizer snap ring. 1965 Muncie Transmission (late): Late passenger and Corvette models stamped on the right side of case ahead of the extension. Another common repair is a rear seal change. Install the rear washer and push the whole countergear to the bottom of the case. Usually the gear and 3-4 synchro hub dislodge if you hold third gear and gently tap on the front of the mainshaft. Heat the speedo drivegear with a propane torch and slide it onto place. Installing the Engine All Muncie transmissions have a ring groove on the input shaft and counter gear. Fit the thickest ring you can into the groove using snap-ring pliers. If so, remove it from the extension. Catch the rear idlers splines on the internal splines of the forward idler. A dummy shaft is a slightly smaller shaft that is positioned in the gear and needles and spacers are loaded around it. Make sure the backside of the teeth faces the thrust washer. I pre-position the bolts in the lock plates and apply sealant to them. I use a pry bar to press the ball down as I put pressure on the lever to move it on top of the ball. gear thrust, 50) Gear assy., \;1"89ek5YAwG Rv($|)d gear bearing CHART *MUNCIE Shaft Identification: Muncie 4-speed transmissions can be distinguishedvfthe rom style of the transmission arm attachment. reverse, 45) Plate, This is an easy repair because failure of the retainer is not caused by something internal. extension oil, 57) Bolt, Extension These casting numbers are always the numbers you want to refer to when looking for a part at a swap meet or while using the modern-day swap meet, the Internet. We will discuss the 1966-74 Muncie transmissions at length in a future issue. It can never be taken for granted that the installation of new parts guarantees a fully functional and problem-free unit. Speed synchronizer, 32) Ring, 1st & 2nd To set up synchronizers, start by placing one key in first and then the other two keys as you wrap the spring around them. 3. buy 4 - 4 and get 15% off buy 5 or above and get 20% off . If the gear and hub do not come off, do not use a hammer to try to remove them. Small parts kits usually have three selective-fit rear snap rings. add #10. muncie 4 speed shifter, no mount, no linkage, repro. Simply lift the forward reverse idler and thrust washer from the case. If the case was damaged from a gear explosion, the thrust washers are often jammed from debris. Fred says: November 1, 2020 at 12:31 am "NVG" stands for "New Venture Gear". The Muncie transmission began replacing the Borg-Warner 4-speed transmission on Wednesday, February 6, 1963, when the first Muncie 4 speed transmissions were shipped to the Baltimore Final Assembly Plant for installation into Chevrolet passenger cars. retaining, 20) Sleeve, 3rd & part #342842 $150.00. cF Reverse detent Brake Light Switches. The 1965 Muncie was identical to the 1964 version. The first character was the last digit of the model year. Of the regular production codes, one particular Muncie 4-speed type appears. 2nd Synchronizer, 31) Hub, 1st &2nd illustrated parts break down illustrates individual part placement in the assembly. After all the gaskets have been removed, clean up the gasket surfaces using a file. Speedometer synchronizer On the other hand, St. Louis-built passenger cars had the letter "S" as the first digit. Some people never disassemble the sidecover when doing a rebuild. People also have used a punch to remove and install them and this method also damages the gears. & Sometimes you can spread the bushing end. 2.697 Wire assembly. MUNCIE M-20/M-21 EARLY, G.M. 2.698 Backup Light Switch. Many Muncie transmissions have had the input shaft replaced so this should not be used for positive identification of the transmission. Once the retainer is installed, clean up excess sealant and bend the lock tabs over. Make sure it clears the front thrust washer and seats in the front bore. 2nd Speed, 29) Ring, 3rd & 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. Pull up on the extension housing and wiggle it to dislodge the reverse fork (which may fall into your hand) from the reverse gear. Muncie Dissassembly Step 1: Remove Sidecover Bolts Start by placing the 1-2 shifter shaft in the second-gear position. 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.". endstream endobj startxref (5/16"-18), 81) Lockwasher, 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. (never If you can, install the thicker one. Transmission Flip the driver upside down and gently tap in the seal until it is seated. D represents the month code when the unit was assembled, April. Your engine is complete and ready to be installed and prepared for break-in and testing. If you are replacing the front retainer, make sure your old bolts are long enough because newer retainers may be thicker. Synchronizer, 35) Synchronizer If the shaft falls out too easily, the case holes have been elongated and need to be repaired. High Performance Forged Synchronizer Rings made by Synchroking! This parts deals with case preparation.Mu. This acts like a sealant and a threadlocking compound. I typically replace the forks because most are worn, and they are just too old. Many Muncie 4-speed main cases, extension housings, and side covers have a casting date code. It remains tacky even when the air temperature is high. Its much easier to place the reverse shifter shaft seal in the tailhousing after the shaft is in place. 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. The remainder of the Corvette VIN stamp was the last six digits of VIN, i.e. Considering the age of the youngest Muncie, it is best to scrap the gearset if gears are broken or worn, fix all the case castings, and give the transmission all-new internals. The 1964 maincase casting number was #3851325 and was used through the 1965 model year as well. Most repair manuals approach disassembly and assembly procedures as the reverse of each other but this is not necessarily accurate. Pry near the dowel to remove the cover. Be careful because you dont want to damage the mating surfaces. Pre-1969 Muncies use a stud and nut at the indicated attachment point, while 1969 and later Muncies use a bolt as illustrated on the right. Use snap-ring pliers to spread the rear bearing retaining ring open and then tap the bearing with a hammer to dislodge it from the ring. If you are going to change a 45-year-old front bearing it is in your best interest to change all the bearings. Shifter lever to Dont force it; gently work it loose. Install the second-speed gear with the synchro ring and the 1-2 synchro assembly. assy., Transmission gear sleeve oil, 66) Nut, Shifter 3. One circle is the Date Marker and the other circle is referred to as the Status Marker. Ive also used a press for ones that have a really tight fit. 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. P stands for Muncie Plant. There are two types of date coding. By 1981 I had developed the first retail rebuild kit for the Muncie. * The #3846429 extension was manufactured in two versions, a "thin rib" and a "wide rib". muncie 4 speed shifter & linkage, 67-68 camaro 68-72 nova 67 fb. Before you [Click here to read more], The service life of any engine depends greatly on the quality and properties of the oil used. Once you have adequately tapped on the bushing, the bushing drops right out. Manual Transmissions Zac . If they are really bad you should change them out. You can use a chisel to easily remove them. We also discussed the best ways to identify a Muncie, which is by the casting numbers on the external components of the transmission. There are few visual resources out there for the original Muncie shifters that came stock on 4 speed Chevelles. (1/4"x 1-1/2"), 75) Shaft assy., Once its together, I trial fit it by installing the input shaft and front bearing from the inside of the case. Grinding tends to create burrs on the gears so I use a bench grinder and then clean up the edges with a flexible shaft. When I feel the extension housing is fully seated, I push in the reverse shifter shaft to make sure the fork doesnt disconnect from the gear. Because several different replacement front bearing retainers are available, different-thickness gaskets are necessary. Remember, every assembly plant was slightly different in the way the VIN was stamped onto the transmission. The number is #3831707. Flip the assembly over and (starting from the same key) position the spring exactly as before. Notice the new fill and drain plugs on the main case. Need an individual part (call with item number off the illustration below) or need a rebuilt transmission, bearing overhaul kit or other parts, give us a call888-824-2012, free technical support. Most are also seized, and you may need to apply heat with a propane torch in this area to knock it out. Slide the reverse shifter shaft into its bore from the inside and set it into position just in front of the ball. Reply. Here, Im using a block of wood. shaft rear bearing 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. It was based on the T10 design, and I have been told that BorgWarner engineers helped design it. Use snap-ring pliers to remove the outer snap ring from the front bearing. The key difference between. The GM Hydra-Matic was a success and installed in the majority of GM models by 1950. 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