Muncie M21 (auto to manual un-conversion)
My 1970 longbed, step-side originally came with a 4-speed manual.
The previous owner installed a turbo 350, which I have now severely cracked. I've been wanting to change it back to a four on the floor. Does anyone have an idea of where I can find a remanufactured Muncie M21, preferably with a super case and mid iron plate? (I've heard the super case and mid iron plate make it stronger; Experience/opinions on this are welcome. As I'm un-converting it, it is my understanding I'll need: A bell housing Flywheel (with number of teeth to match my starter) A pressure plate A clutch Clutch fork, and a Pilot bushing or bearing. It was suggested I look for a donor truck to get the majority of the parts needed for un-converting it. Fortunately, it looks like I'll have shop access to do the work. Any ideas/insights into this project are most welcome. This is the last moving part I need to replace. After this, I can finally get to the body. Thanks, all! |
Re: Muncie M21 (auto to manual un-conversion)
Looks like you have it covered pretty well. You will also need a shifter and the clutch bellcrank and pedal parts. Some headers can interfere with the bellcrank. Hurst shifters work well on those boxes.
I just switched out a turbo 400 for a T56 magnum. Having overdrive is nice. In my install I went with a hydraulic clutch. Russ |
Re: Muncie M21 (auto to manual un-conversion)
Not a problem , My Muncie guy rebuilds them for a living and can set it up anyway you want . Last count he had more than 150 in stock and he builds them for muscle car guys all over the country with a warranty . you can use a stock bell housing but it has to be from a 67 with the smaller trans hole if I remember correctly and I have those along with the clutch forks (stock) you should be able to use your current driveshaft and use your local auto parts store for the clutch/pressure plate and throw out bearing you can find clutch kits on ebay for $100.00 up depending on what HP your running . shifters are easy to find just not cheap for good ones , Do you still have your clutch pedal setup ? I have those also if you need it All the pieces are available all you need now is $.
See, Easy Peasy :chevy: |
Re: Muncie M21 (auto to manual un-conversion)
Great info!!!
Grumpy, I'll be hitting you up when I get closer on my 67 build! |
Re: Muncie M21 (auto to manual un-conversion)
Grumpy,
What is your friends contact info? Does he warranty his work? May not need the super case and mid iron plate; I've got to armor plate the underside, anyway; The truck needs to be a mountain rod, as that's where it lives. Another friend of mine thinks I ought to find an old blown up Vette and scavenge the five speed out of it, though for major parts, I'm looking for truly remanufactured with a warranty- not just rebuilt, I could do that myself. Send me prices on the parts you have, and the zip you ship from, please. Thank You! |
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