Muncie rebuild - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Smitty52 · 05-28-2011, 11:49 PM

Hello im new to the forum and im 18 i just started doiing my own work on my truck. i have a muncie 4-speed and i'm pretty sure i cracked first gear this morning i no longer have first gear. Is there a rebuild kit that could fix it or do i need to by a new one. Thanks vfor your time

67c10rustbuket · 05-29-2011, 05:58 PM

All of the internal parts and gears are available through aftermarket. you will need to check all the casting numbers to properly ID your trans , a real muncie had 3 different gear ratios and are usually called a M20, M21, and M22 (aka the rockcrusher). not all 4 speeds are muncies so make sure you properly ID it or have a transmission shop ID and order the parts. I have seen rebuild DVDs and books on ebay and other websites if you want to do it yourself. Enjoy !

solidaxel · 05-29-2011, 06:14 PM

Welcome from So Arizona !

Is 1st the only gear that does not work?
Are you sure it is not the linkage or the clutch or the driveshaft or rear end, or axle?

If first is not working it may have broke something isside and by starting and letting out the clutch you may do MUCH more damage with broken parts getting caught between the cluster gear and another gear.

I would stop and remove the trans and take the sidecover off and inspect the gears by rotating the input shaft. You will be able to see what is damaged

05-28-2011, 11:49 PM	#1
Smitty52 Registered User Join Date: May 2011 Location: Everett,Washington Posts: 6	Muncie rebuild Hello im new to the forum and im 18 i just started doiing my own work on my truck. i have a muncie 4-speed and i'm pretty sure i cracked first gear this morning i no longer have first gear. Is there a rebuild kit that could fix it or do i need to by a new one. Thanks vfor your time

05-29-2011, 05:58 PM	#2
67c10rustbuket Registered User Join Date: Apr 2011 Location: Mustang, Oklahoma Posts: 2,807	Re: Muncie rebuild All of the internal parts and gears are available through aftermarket. you will need to check all the casting numbers to properly ID your trans , a real muncie had 3 different gear ratios and are usually called a M20, M21, and M22 (aka the rockcrusher). not all 4 speeds are muncies so make sure you properly ID it or have a transmission shop ID and order the parts. I have seen rebuild DVDs and books on ebay and other websites if you want to do it yourself. Enjoy ! __________________ Dan <---(my name) 67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car

05-29-2011, 06:14 PM	#3
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: Muncie rebuild Welcome from So Arizona ! Is 1st the only gear that does not work? Are you sure it is not the linkage or the clutch or the driveshaft or rear end, or axle? If first is not working it may have broke something isside and by starting and letting out the clutch you may do MUCH more damage with broken parts getting caught between the cluster gear and another gear. I would stop and remove the trans and take the sidecover off and inspect the gears by rotating the input shaft. You will be able to see what is damaged __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42



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