ARe the muncie loud and are they good at the track? Do they hold up?

ARe the muncie loud and are they good at the track? Do they hold up?

I've got a m21 muncie. Not too loud at all. Or maybe I can't hear it over my car lol?

I dont know how they are for performance compared to other gearboxes. I do know that they are more efficient and you lose less power than TH350/TH400.

what gear do your run and what kinda rpm do you run on interstate?

I have run 575-585hp through a midly modified box. I thought it was blast to drive with a 3.42 rear end... on the street and at open track events.

25.7" tire, 3.42 in fourth... right about 2675 rpm at 60 mph.

I have run 575-585hp through a midly modified box. I thought it was blast to drive with a 3.42 rear end... on the street and at open track events.

25.7" tire, 3.42 in fourth... right about 2675 rpm at 60 mph.


I think it's hard to beat an M-22 which is what I was running in my '68 and now I'm running it in a heavy truck with a 460 BBC.....gobs of torque. The M-22 is louder than the 20 or 21 because of how the gears are cut at a straighter angle to put less load on the tail shaft. It causes them to have a slight whine like a gear drive. I think it sounds sweet, but I don't have a stereo and just like to listen to the motor/drivetrain.

What can i get one for built and getting ready to go???

those suckers have really gone up in price......usually 1,500 or so used.....sometimes cheaper. I think you can get them new with better Italian gear for 2,200-2,500. That might be a low est. though.

Autogear M22W is $1950.00 plus freight from Syracuse, NY

I run a 3.73 gear, at 70mph on the interstate I'm turning almost 3500rpm lol. There is some whine nothing crazy, but I can hardly hear anything w/ full length headers and 2.5 inch flowmasters.

THere is a bit of whine w/ the m21, much more so w/ the m22 because as mentioned above the gears are straight cut.

10-4 on the price increase. Of course in the hot rod world what's cheap anymore.... LOL! I call the Muncie a good new bad news trans of sorts. The good news is they are still relatively cheap as compared to the high tech stuff, will run a long time even out of tolerance, and really hold up nicely unless trashed really hard.. The bad new is they aren't the strongest 4 speed in the world, tolerances from the factory varied immensely so no 2 go together alike, and the aluminum cases stretches under hard hole shots. But all in all a darn good unit.

Note one of the weak spots in the trans is the aluminum mid plate so if one is going to put some HP to it then a steel mid plate is the ticket. Yes the M-22 is by far superior in strength but exactly how much is a guess, GM never put torque ratings on the Muncie but it's assumed by some in the field that the early 63 thru 65 M20/21's units held 400ft lbs, the 66 thru 74- 450 ft lbs, and the M-22 550ft lbs. Again probably a guess but a number to work with.

Food for thought.

Can you say TKO?
5's definitely better than 4.

Can you say TKO?
5's definitely better than 4.

I totally agree......but when you have a true '69 M-22 with shifter, clutch, pressure plate, flywheel, and fork sitting on your garage floor, for a whopping $800.....it's easy to brag about what you already have. I'd trade it in a heartbeat for that TKO!!!! It's funny how you are running thru the gears saying "this isn't so bad"....then you hit fourth and say "that's it?????" The rest of your journey is at 3,200 rpm's. Time to get that lottery ticket......