raylag64

I've read a bunch of threads about converting 3rd gear to overdrive and switching the 3-4 lever upside down to maintain the shift pattern, but I don't know where to purchase the kit or gears to set it up. I like the idea of keeping the original '64' M20 in the car. Paul Cangialosi of 5SPEED does not sell the gears. Any idea where I can purchase them?
Any help would be appreciated.
Thanks,
Ray

DSR

You could maybe check out Auto Gear Equipment. They may have what your looking for.
Muncie parts and updated overdrive Muncies.
www.autogear.net

Cpe04

Autogear used to make this gearset , but i think it's been discontinued.

wmf62

I agree, last time I looked all I could find was that it was discontinued. might be worthwhile contacting autogear.

BUT, if you can find a MY6, it's a 3spd with OD. Both Plasticman and myself have or are using one.

Bill

GTOguy

The M21Y gearset offered by Autogear and Riverside Gear was discontinued around 2010 due to lack of sales. It turned your 4 speed Muncie into basically a wide ratio 3 speed box with an overdrive of about .80:1. Had a 2.19:1 first gear ratio. So would be best for cars with a 3.55 or steeper rear gear. Also, the shift pattern was a bit strange. Something I would want in a pickup truck, but not in a performance car. With an original '64 M-20 with its 2.56 first gear, a simple swap to a 3.08 rear end third member would give a nice running car on the open road and still decent performance around town. Cheaper than a transmission transplant, and you can keep your original gearbox. Less hassle to install, too, given the tightness under a C1-C2.........

68hemi

That is what I just did to my 57, but it has a 383 stroker engine so it has plenty of power on the low end even with the tall 3.08 gear,

wmf62

I don't understand what would be strange about the shift pattern. the linkage configuration is just like the MY6, and I used a standard hurst 4spd shifter with mods to the mounting plate and shift rods.

and it is a direct replacement for a Muncie.

Bill

GTOguy

Overdrive is where third used to be. Up and over. So 'high' gear is no longer where 4th used to be... It's where third used to be.

wmf62

you're kinda sorta right, but not quite; on the MY6 (and the Muncie) OD is where 4th used to be in a standard H pattern, and 'high' is where 3rd was. but not really strange except in the terms of a modern 5 or 6 speed where OD is over and up.

VERY easy to get used too

Bill

raylag64

I had 3.08 gears and It had no problem taking off, but I found it cumbersome in town or in traffic. Couldn't creep in traffic without feathering the clutch to much. So I dropped in 355's.

raylag64

Spoke with Nathan today at Auto Gear. He said he has everything but second gear (WT297-21C). Warned me not to buy anything unless I could get my hands on one first. Also told me that I would have to go back to a 3.08 rear to make it worth while.

raylag64

I appreciate everyones help. Think I need to find an MY6, and put the M20 on the shelf.

Jbabek

You may want to try G-Force in Asheboro, NC. They did a bunch of this stuff years ago, but if I remember correctly they had troubles getting the ratios to work out based on the primary tree gear teeth. All of their stuff was racing stuff, but the ratios may work out for a street car.

At any rate, give them a try.

Plasticman

As a fan of the MY6 (have been running it since 2006), please note that the gear spread is "wide" (think wide as in shifting from 1st to 3rd with the typical standard 4 speed), so it needs an engine with a wide torque band.

Gearing is 1st: 3.09, 2nd: 1.68, 3rd: 1:1, 4th: .73 OD.

I run it with a 3.55 rear gear. Think Bill's (wmf62) rear gear is a 3.36?

plasticman

wmf62

it is, and the 3.09 first gear made city driving a pleasure....

Bill

wmf62

you need to get the right one to go with a standard chevy BIG bearing retainer hole bellhousing. there was another version that required it own bellhousing.

the correct bellhousing is a truck bellhousing and is available in an open bottom cast iron and a fully enclosed aluminum.

Bill

scotty t

I've got an MY6 in a 57 with a 3.36 rear. It takes some "getting used to" but works well, if you've got the torque.

GTOguy

I would pull the 3.55's and re-install the 3.08's and move to a less crowded area where you can get out of first gear.

raylag64

If I pull out of my street and go left, it's 2 miles to town. Go right an it's all country roads. Just what I like best.
Spoke with Jody today of Jody's Transmission, and he told me I should consider a World Class T5.
He's extremely knowledgeable. One thing he told me was that I would need to get the Ford tail section for the shifter location. and best to purchase a G-Force kit to handle the HP. Been on line and it would cost as much as a new 5 speed. He also said I would have to modify the shifter to fit the original opening. I will not modify the opening in the console. I'm feeling tired and weary and I haven't been in the garage yet.

elle88

i still have an autogear M21y overdrive gearset . got it years ago to do the overdrive mod on my 69 with 4.11 rear end. i bought also the iron midplate. i think i posted something about long time ago...at the end i never installed it because i gave up modding my car... a little tired...i believe that m21Y gearset was still made for autogear in Italy , Modena i think , by worldwide leader gearset manufacturer ...cant recall the name... after ...i heard that manufacturing was somewhat moved to far east...i dont know if true... if anybody interested...is available