Step 10: Install Retainer Gaskets Because several different replacement front bearing retainers are available, different-thickness gaskets are necessary. 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. Orders canceled before 30 days will be charged a 20% fee of the original order price. Step 10: Clean Up Once the seal has been installed, wipe any excess sealant off the housing. Never use a dummy shaft to load needles.
I use the case to support the cover when I press in the sidecover seals with a 17-mm socket. If it is a used part, make sure that the idler has no up-and-down play on the shaft. The installation was easy, only took about 4 hours, and made our sloppy shifter into a real slick shifter. The countergear is still dropped to allow it to be placed in this position. Did not check the clevites from rock auto and saw those damaged in shipping during installation. I spend most of my time building new transmissions with all-new parts.
Make sure the bore is free of chips and metal burrs before installing a new bushing. Probably never will have to again. Check for any nicks and deburr all rough edges. Prepare Hub and Slider Assemblies Step 1: Position Synchro Hubs The synchro hubs are positioned so that the forward edge of each hub faces the front. Make sure the backside of the teeth faces the thrust washer. Step 8: Prep Gears for Assembly 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. We accept credit and debit card payments via Paypal.
. Muncie Rebuild Kit The most frequently replaced hard parts are shift forks, sliders, and the front retainer. This is the shifter that was used in 1968 Camaro's with a Saginaw transmission. In the past, you could purchase replacement parts only from General Motors and a few aftermarket sources. Step 2: Remove 3-4 Synchro Hub Professional Mechanic Tip Usually the gear and 3-4 synchro hub dislodge if you hold third gear and gently tap on the front of the mainshaft.
Soft parts are included in a rebuild kit but hard parts are not. Never strike the input shaft itself. They are soft steel and are left-hand threaded. Step 4: Install Spring Flip the assembly over and starting from the same key position the spring exactly as before. 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. Fit the thickest ring you can into the groove using snap-ring pliers. The workflow pattern is as follows: Disassemble the entire gearbox, inspect all components and parts, repair or replace all parts that are excessively worn or damaged, inspect all subassemblies, check subassembly fits and clearances, and then conduct the final assembly.
Step 2: Install Tailhousing on Midplate Placing it forward makes it easy to attach the fork to the reverse gear. The factory never used lock washers and they are often seized and break. It cuts a nice slot in the bushing when you hit it with a hammer. Step 6: Check Reverse Arm Position Be careful not to go too far or the ball pops out. Started the motor, ended up having antifreeze leaking out of the front two water fittings, yes, more got in and had to take that off after just dealing with the bottom end. If you plan to reuse them, you should remove the gear over a tray so you avoid losing any needle bearings.
Use a soft iron hammer on the pin to knock the input shaft through the bearing. Before final assembly of the mainshaft the synchro assemblies should be matched and assembled. I use grease to hold it in place. You can grind down the tang down if it does. The Muncie 4 speed,was first designed in 1963,and lasted until 1974.
Step 14: Remove Outer Snap Ring Special Tool Use snap-ring pliers to remove the outer snap ring from the front bearing. Obviously, those are easily removed. Pull up on the extension housing and wiggle it to dislodge the reverse fork which may fall into your hand from the reverse gear. Having all these subassemblies ready to go on the mainshaft helps to keep you organized. Sometimes you can pry on this and remove the bearing. Got a real oil dipstick that blew out and wrecked the header coating.
Again, this is something you cannot do with a dummy shaft. Step 13:Tap in Sidecover Seals I coat the outer edges of the sidecover seal with Permatex 51813. From short tracks to drag strips and car shows to museums, the Muncie transmission can be found in a variety of vehicles. Step 9: Inspect Combs for Straightness The combs must be flat. 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 absolute best think I did was weld a tab on the trans bracket with the reverse light switch that is the only thing that has been flawless. Step 9: Remove Anti-Rattle Springs Some mainshafts have circular grooves cut into the reverse gear spline for these tiny anti-rattle springs.