Well after a spirited run, I sheared off the teeth on the input shaft gear and the main cluster. I have had this transmission in my car for a few years now. Probably only about 500 miles since I put it in. It was a used transmission, so im not too sure on the history of it.
Decoding = 1965 M20 10spline input 24T/ 27spline output.

should i just replace the damaged gears in the M20 or upgrade to a M22 ( wide ratio).

After I went from a TH 350 to the M20 I thought I was done breaking transmissions....... I guess I was wrong.

One thing i did notice was the input shaft had some play in it, I thought it was normal ???

Muncie Experts please chime in!!

here are some pictures
http://i11.photobucket.com/albums/a158/SILVPTYPE85/CAMARO/4eca4ceb.jpg
http://i11.photobucket.com/albums/a158/SILVPTYPE85/CAMARO/bc28e9e2.jpg

M22W, you exceded the limit of an M20 already. Look at your pictures!

M22W, you exceded the limit of an M20 already. Look at your pictures!

I guess I did, what is the limit??

What Exactly do you think happend here ? too much torque??? too fast of a shift??? or maybe i had too much play in the input shaft???


is your M22 avaliable in a 10 spline input and 27 spline output? or should I just change out the clutch and rear slip yoke to match?

Those new autogear transmissions are expensive. Have you considered a TKO?
Overdrive is nice.

Chewing up the input gears like that is weird. Not a shifting thing for sure. I'm thinking maybe something got in em? Stray roller perhaps?

I'm not sure, I have yet to dissassemble it fully. I'm thinking that the freeplay in the input shaft may have had something to do with it

Recently, with Jody's help, I fully rebuilt an M22 transmission with the M22W gearset and full rebuild kit. It's in the car now and I really like it. You can rebuild your Muncie with the M22W gearset for about 1/3 the cost of the TKO overdrive tranny kit. With that said the TKO600 does have the advantage of the overdrive and that may be the direction you want to go.

Overdrive would be nice.... but I think I will either replace the broken parts for now, or go with a M22W gearset. I hope the case is ok, looks like the input gear may have worn into the case. Once all the holidays are over then hopefully I can get to it.

Overdrive would be nice.... but I think I will either replace the broken parts for now, or go with a M22W gearset. I hope the case is ok, looks like the input gear may have worn into the case. Once all the holidays are over then hopefully I can get to it.

The 325 case must be machined to accept a 1" countershaft to utilize the M22 or M22W gearset.

With a gear explosion such as yours, I would think your case centerline between the countergear and mainshaft have been stretched.

Recently, with Jody's help, I fully rebuilt an M22 transmission with the M22W gearset and full rebuild kit.

Don't let Andrew fool anyone here, he had everything under control with his rebuild. Post some pictures of your transmission rebuild, your attension to detail is tops.

Thanks for all your help, I guess I will look into a new M22
I really liked the 2.56 1st gear that the early M20 had.
So I guess I will probably go with the M22W set up.

How about the RICHMOND 5 Speed ?? they hold up pretty good?

Instead of some photos here is a link to my summary of the rebuild that includes a couple of photos.
http://www.camaros.net/forums/showthread.php?t=121208
Project69 - since your case might be damaged, or at least needs modification to the 1" shaft, you might pick up the individual case parts that you need and reuse what you can. The Richmond 5-speed would also be a nice option with a rear gear to take advantage of it.

Agree with Jody. Once the early case is stretched it will continue to do the same thing it did to every gear set you put in it. Get the case machined for 1" and go from there.

Well I have decided instead of messing with the old transmission, I am going to just buy a M22 wide ratio. Jody do you have complete units (ready to run) in stock? If not, does anyone know of a good supplier that I can get one from?
I would prefer to stick with the 10 spline input/27 output.
I also may need a stock bellhousing for an 11" clutch. I have a USED Lakewood on it at the moment, but I am having issues with the clutch also (pedal seems to get hard when clutch heats up). I figure replace the bellhousing, clutch fork and Release bearing. I suspect the clutch fork may be wrong. Note: clutch operates flawless when cold or for the first 30 mins. of operation.

check your bellhousing runout. If it's way off, it would affect your clutch like that, and may ak\lso have taken out your trans. The fix could be as little as a dial indicator and some offset bushings. edit I mean offset dowels.

check your bellhousing runout. If it's way off, it would affect your clutch like that, and may ak\lso have taken out your trans. The fix could be as little as a dial indicator and some offset bushings. edit I mean offset dowels.

If I went with a stock bellhousing will i need to check the runout?
I got the Lakewood bellhousing for free, I would rather use a stock bellhousing if it will not require any set up.

Well I pulled the Lakewood bellhousing. I found that the clutch fork is damaged, and the Release bearing has about half of the edge broken off, I think this could be the clutch issue. I am going to put a new "621" bellhousing, clutch fork, possibly a new Flywheel, and Clutch. I figure may as well fix it right this time. When I did the swap a few years ago, the only parts that were new was, The pressure plate, Clutch, Release Bearing, Clutch Linkage, Shifter Assembly. The Transmission, Bellhousing, Flywheel, were used.
This is turning out to be more expensive as it goes on........ probably close to the cost of a TKO swap ?

Well I have decided instead of messing with the old transmission, I am going to just buy a M22 wide ratio. Jody do you have complete units (ready to run) in stock?

Yes, I sent you a PM.