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The Muncie M-20 wide ratio 4-speed transmission equipped with the Hurst Competition Plus shifter. The shift rods were loose. After inspecting the linkage, it was time for disassembly. Note that there are no shifter stops on this factory-installed shifter.
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Here is the worn forward shift lever removed from the transmission. You can see the spread area caused by numerous hard 1-2 power shifts. This increased interior dimension can result in the transmission detents not returning to Neutral.
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With the damaged area brazed to fill the spread/worn area, hand file the shift lever back to its original size. Take your time, file and test-fit the lever until you have it right and tight being careful to not remove too much of the material.
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File fit back to its original interior dimensions the shift lever is ready to be installed.
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In some instances, where the shift lever is not too worn or elongated, the metal can be swelled back to size using a center punch and ball peen hammer.
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The Competition Plus shifter has holes correctly located front and back on the shifter body, properly positioned and ready to be drilled and tapped for the installation of shifter stop bolts.
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The final drill size for the 3/8x24 thread tap is 21/64. Securely clamp the shifter in a vise. First use a pilot drill and then the 21/64 drill. Go slow to ensure a clean circular hole for the thread tap.
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Tap the drilled hole with the 3/8x24 thread tap making certain to lubricate the tap as you create the thread. After the hole is tapped, use some carb cleaner and compressed air to clean any remaining filing from the shifter before installing the stop bolts.
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The shifter stop bolts are 1-1/2-inch 3/8x24 thread bolts. A jam nut is utilized to lock the bolt in place after adjustment.
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With the shifter stop bolts installed you have successfully upgraded your shifter. Time to reinstall the shifter, upgrade the fasteners and adjust thing right.
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Here is the standard wave spring washer compared to the new heavier spring washer used in connecting the shift rods to the transmission shift levers. The new heavier wave spring washers eliminate the rod rattle.
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The transmission shift levers are first installed onto the side case with new, hardened washers and lock nuts. Next, the shift rods are attached to the levers utilizing the new wave spring washers and nuts.
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With the transmission in Neutral, the shifter is placed in Neutral with the alignment tool in place to assure position.
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Secure the shift rods to the shifter levers. Adding hardened washers reduces the slop in the linkage. Make certain to bend up the end of each spring clip for good insurance.
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With the linkage assembled, it's time to set the shifter bolt stops. The front bolt stop is for 2nd and 4th gears while the rear bolt stop is for 1st and 3rd gears. To adjust the stops, place the transmission firmly into gear. By hand, run the bolt up until it touches the shifter lever then back the bolt out one complete turn and tighten the jam nut. Repeat for the other stop.
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The shift rods are now firmly attached to the transmission levers and the shifter. With the shifter stop bolts adjusted you can be assured of minimal wear on the transmission shift levers. You're now officially a shifty character.
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