I want to swap my M21 Muncie for the M22 Muncie Rock Crusher and was wondering if this is a straight exchange or are there any other parts that need to be changed. Will the linkage, shifter etc. go from one transmission to the other. Thanks for any information.....bbs...

There is no easy answer to this, partially due to production/engineering changes in the transmissions, partially due to the fact that by now most Muncies have been messed with by rebuilders-early transmissions may have later parts and vice versa. Even if the trans in the car is OE I'd remove it to learn what I am starting with. To be a true "bolt-in", the M22 must have the same input/output shaft splines as the current Muncie. If it does not you will have to change the clutch disc and/or driveshaft yoke. Next match up tailshaft housings. Early housings have 3 shifter mounting lugs, later housings have 5. The shifter you are using may work with either, check first. There are also side cover differences but I do not believe this affects shift linkage.

Don't bank on the production year changes all of the books list. We had dozens of used & rebuilt Muncies over the years and many were a hodgepodge of parts.

My mistake!!!! Let me ask this question a different way.I have removed the motor and transmission from my 69 RS/Z28 and want to go to a high horse power aftermarket smallblock. The original transmission is a M21 but with the change in motors that I want I think it would be better to go with a M22. Now as far as fit what do you think I would have to change and what parts would I have to change. Again thanks...BBS...

The splines going into the clutch could be different fine vs course, shifter and linkage same, yoke chould be different also, not sure, depends on year of M22, but that should be a simple swap, I think it is the same yoke as a turbo 400. good luck http://www.camaros.net/forum/biggrin.gif

------------------
1969 RS Z28 Black, white deluxe interior,
http://www.corvetteforum.net/c3/corvettj

There are two length slots used on the shift arms.
Early muncies used a smaller shift arm slot, the earliest had a stud to hold the shift arm on. Then they went to a bolt, then longer slots.
The hurst shift arms can be replaced with longer slotted ones to fix it.
The steel is too hard to file out.
I think you need a Turbo 400 yoke for the M22.
David

------------------
Check my web page for First Gen Camaro suspension info:
David's Homepage (http://ourworld.compuserve.com/homepages/David_Pozzi/)
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Can Am Vintage Racer

The m-21 should be strong enough unless you are going over 450 hp

------------------
Jay 69 SS-350

Hello, Let me get this straight, you own a 1969 RS/Z28 and you yanked the motor and trans out of it. If you want to tool around with a big horsepower small block why did you choose such a collectable car like a 1969 RS/Z28 to chop up. I would give my life for that car in #'s matching shape and now there is one less example out in the world for me to choose from. next time you should consider tearing up a Ford instead.

I have no idea what he is doing but I doubt it is chopping it up. If I owned it I would probably put the engine and trans in a corner of the garage and put in a engine and trans comnbo to beat around in. I am all for driving these things as much as possible and how they were made to be driven. Knowing that, I wouldn't want to drive the car with the original engine and trans. If he was tubbing it to go racing then.......

phat - Back the truck up for just a second... He didn't say that he tossed the matching #'s mill or sold it off!! Many folks set the engine on a stand and replace it for a period of time so they can still enjoy driving their car without lunching the matching #'s mill... It's done quite often... After a few years it's a frame off and back to stock mill and the car becomes a restored trailer queen or something...

I would imagine the M-21 should be fine unless you are going drag racing. All 4 speed Yenko Camaros came with M-21's as did most of the manual trans ZL-1's. If you were going to replace the M-21 w/another manual trans, you might consider a 5 or 6 speed to make it more driveable.

My L72 is setting under my work bench and a 71 LS5 in in my Corvette for the same reason it is not possible to replace the original engine. Now to the M22 why bother it is not enough stronger to bother with and costs an awful lot more. If you want to save you M21 I would suggest you find an M20 they work alot better for a street car.

<BLOCKQUOTE>quote:</font><HR>Originally posted by phatious:
Hello, Let me get this straight, you own a 1969 RS/Z28 and you yanked the motor and trans out of it. If you want to tool around with a big horsepower small block why did you choose such a collectable car like a 1969 RS/Z28 to chop up. I would give my life for that car in #'s matching shape and now there is one less example out in the world for me to choose from. next time you should consider tearing up a Ford instead.<HR></BLOCKQUOTE>hey phatious i agree with you.i,m saving one for you in my garage in rallye green.

phat i agree with you, but it is his car, he paid for it, he owns it he can modify it if he wants. personally i would just rebuild and restore the car to its original shape. but it doesnt pertain to the question asked, lets stick to the topic here. thanks.

Most guys I know that insist on running a Muncie drag racing prefer the M20 to the M21 because of the lower first gear. I've seen the M20s run on big blocks and all kinds of high powered small blocks at the strip. Granted I much prefera glide or TH400 for race only purposes. But I understand for dual purpose cars it is much more fun on the street with a 4 speed.

To answer the original question. If you purchased a 69 or earlier M22 it will be a direct swap. If you got a 70 or later M22 then the output shaft splines are different and you will need to replace the cluth plate and front yoke on your driveshaft or your entire driveshaft. 70 and later M22's use a 26 sline input shaft vs. a 10 spline 69 and earlier. The output shafts are also different 32 splines 70 and later, 26 splines 69 and earlier.

I think the post 70 M22 uses the same yoke as a TH400 transmission but then you will need to use the U-joints that have 2 different sized bearing caps to fit it to your drive shaft.

------------------
Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11

I don't know how much you are spending on this M-22 but you might want to consider the richmond Super T-10 or the richmond 5 speed, both can handle alot of power and you can get them with a whole bunch of different gear combos. But then again those M-22's have a great sound!

I'll throw in my free advice, which is worth what you paid for it http://www.camaros.net/forum/smile.gif , but if you go the M-22 route, all you'll have that you don't have now is an empty wallet, more noise, and some bragging rights. If you're going to race it, you're better off with an M-20.

------------------
JohnZ
'69 Z28 Fathom Green

<BLOCKQUOTE>quote:</font><HR>Originally posted by JohnZ:
I'll throw in my free advice, which is worth what you paid for it http://www.camaros.net/forum/smile.gif , but if you go the M-22 route, all you'll have that you don't have now is an empty wallet, more noise, and some bragging rights. If you're going to race it, you're better off with an M-20.

<HR></BLOCKQUOTE>the m-20 is a wide range,the m-22 is a heavy duty close ratio. i,m sure there is good reason the m-22 cost almost twice the price from the factory.so you will have a empty wallet and a closer ratio.

I think you choose your ratio based on your engines power range.For instance,a high winding 327 might like the close ratio,and a 383 stroker with a wide powerband might like an m20 wide ratio,although I dont think the m20 would like the 383 stroker.If your motor makes awesome power from say..3500-6500,and you buy a trans that when shifted at 6500 only drops to 4500-5000,you are wasting potential and having to shift too fast.Instead of paying $1300+ for a new super t10 or a 5 speed from Jegs,I would buy one of those M22s from that jet boat bill dude on ebay,those have that new super case that stronger than an original M22.I think he sells them for $1700-1800,and sometimes with a shifter.I almost bought one,they kick a$$.