The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 09-27-2016, 07:42 PM   #1
Eric1970
Registered User
 
Join Date: Apr 2012
Location: High Country, CO
Posts: 14
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!
Eric1970 is offline   Reply With Quote
Old 09-27-2016, 07:56 PM   #2
Ruscal
Registered User
 
Join Date: Jun 2013
Location: Carlsbad, California
Posts: 165
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
__________________
RC
Ruscal is offline   Reply With Quote
Old 09-27-2016, 08:03 PM   #3
Grumpy old man
Senior Member
 
Grumpy old man's Avatar
 
Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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
__________________

1967 Factory short bed - Old school
'71 - 350 / 4bolt / 487 heads / Edelbrock C3BX
Muncie M-22 4 speed / Hurst Comp plus
Factory 12 bolt posi 3.73 / 255-70-15
Smoothed firewall / Factory cowl induction
Power disc brakes / power steering / 3.5-5" drop
Grumpy old man is offline   Reply With Quote
Old 09-27-2016, 09:55 PM   #4
jr1000yarder
Registered User
 
Join Date: May 2016
Location: Pa
Posts: 1,278
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!
__________________
IT IS WHAT IT IS
jr1000yarder is offline   Reply With Quote
Old 09-28-2016, 06:59 PM   #5
Eric1970
Registered User
 
Join Date: Apr 2012
Location: High Country, CO
Posts: 14
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!
Eric1970 is offline   Reply With Quote
Reply

Bookmarks

Tags
muncie, transmission


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:58 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com