They are for economy and street drivability and just cruising. The Muncie M21 is a close-ratio unit originally designed to be matched with 4.11:1 or 4.56:1 GM 4 Series differentials. The M21 was for higher performance cars. A close-ratio gearbox keeps shift points closer together, which keeps rpms up.
TonyMemberfrom Rochester NY. USA. ""You can outfit an M20 or M21 with Rock Crusher type gears, OR actually make a 3 speed O/D out of a 4 speed case. Forth being the overdrive obviously.. Actually the 3rd gear station becomes the OD and the 4th gear station becomes 3rd,so the shift pattern is a little d,1-2-4-3.
The most well known Muncie transmissions are the M20(wide ratio), M21(close ratio), and the M22(rock crusher). Although not mentioned much, there was also an M23 transmission that was used, beginning in 1970. The M23 is recognized by a 26-spline(fine) input shaft and a large output shaft that requires a T-400 driveshaft yoke. ...
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4582 posts · Joined 2017. #7 · Oct 10, 2020. In my opinion the super T10 is stronger than a wide ratio muncie weaker than a close ratio non m22 muncie definitely weaker than a m22 but a good box for decent power heavy street car without a ton of power. My last 4 speed was my 70 monte carlo before the switch to LS & auto.
Well, yes, that is correct-----for 69-later Muncies. The A-B-C after the date code did not begin until about Oct 68 for 69-later Muncies. Beginning with the 66 M22, ALL M22 Muncies had a drain plug and M20 and M21 did not have a drain plug. BUUUUUUUUUUT, people, such as me, who rebuild 4spds frequently install a drain plug.
RusscoMemberfrom Central IL. IIRC its about 19* on a M22 helix angle and close to 40* on M21 and usually no rings on input shaft splines= M22 1 ring= M21 2 rings= M20. M22 also came in 10 spline or fine spline the early ones were 10 spline changed to fine spline early 70's. Russco, Apr 18, 2009. SHARE POST #8.
8. The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74.
An M22 'Rock Crusher' was a good trans. New ones for performance cars do the same thing but better. Bear in mind that the only thing really special M22 vs M21 was that the M22 was close-ratio box and that the gear teeth are cut differently in the M22, so they were less likely to break.
With a 2:73 gear set you should stick with the M20 as its 2.56 gearing is a better 1st gear to go with a high gear like that rear end. The M22's 2.20 1st gear will need some help taking off. You could always go with a 3.73 to go with your M22 (which that trans does not look to be) and your new big block could be a 496.
The 71-74 Muncies are 3/4in longer than the 63-70 Muncies, B-W T-10 and the 55-57 3sp. Even the 66-70 M22 had 10-27splines (DO NOT, DO NOT, DO NOT let …
The naysayers are saying "nay", again!! :here!: Now that my TKO 600 is all installed and functioning flawlessly, people are telling me I should have installed a Muncie M22 in my car instead of a TKO 600? I just finished the project, and already I have received this criticism from like 4 different gearheads. They say the old Muncie is bulletproof and …
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.
the m20 with it's lower 1st gear ( higher numerically ) will give you better torque multiplication in 1st gear.. the m22 will have 2nd and third gear closer together. you won't see as much rpm difference between gears. Reply Like. 03-06-2014, 06:05 PM.
The M22 usually has no groves on the input shaft,the M21 has one,and the M20 has 2.The M22 has the drain plug at the bottom for the trans oil to be drained.The others don't.M22s,and all the muncies are great trans,but don't just get one because of the muncie hype.The Super T10 is also, a great trans,and usually cheaper.The Corvette …
What is the difference between a Muncie M20 M21 and M22? The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio …
The new Muncies being built today have some better ratios.Today's examples of the new car gear set ups are Mustang GT's with a 3.35 1st gear and 3.08 rear. New Camaros with a 2.68 1st gear, 3.73 rear gear and .59 overdrive. ... Top countergear is an M22. Lower gear is an M20. Notice the different helix angles of the gears.
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Rick, I'm not the expert on these here, DZauto is but here it goes. The M22 is the "rockcrusher" tranny. It's a bit more heavy duty than the M21 and much rarer. It's called a rockcrusher due to it straighter cut gears which whine ( and are stronger ). The M21 is a standard Muncie 4 speed. They both have the same ratios beginning with a 2.20 1st.
I was just wondering how many different variations there are of the Muncie 4 speed and which ones are best and for what reason (s). I currently have an M22 Rock …
793 posts · Joined 2007. #1 · Jan 31, 2008. 5speed has NEW Muncie M22s with 2.56 1st gear. Starting at $1695.00 for all new--stronger trans. They also have M22s with 2.20 first. You guys probably knew this but I thought I'd put it out there. Food for thought. 64 Vette Roadster 400 ci. 70 Thunderbird 429 ci.
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To confirm this simply look at the VIN number. It will usually begin with a 18S101350 or a 28N12950. This means the Muncie was assembled December 13, 1967 for the 1968 model year. The VIN number will usually be a low number. 1969 to 1974 Muncies got a ratio designator at the end of the serial number.
R. Rick_L · #2 · Jul 6, 2011. I would not recommend a Muncie M22 or M21 for any street driven or drag race car. It's simply not the right gear ratios for anything but road racing. The 2.20 low gear is just not low enough. If you want a …
cheveslakr said: As built new at the factory, ALLLLLLLLLLLLLLLLLL M21 (close ratio with 2.20 1st gear) Muncies had one ring around the input splines. The 63-65 M20 (wide ratio) Muncies with a 2.56 1st gear, DID NOT have any rings around the input splines. Beginning in 1966 (again, as built new at the factory), ALLLLLLLLLLLLLLL M20 …
THUS, the split between gears of the early and late versions was different. The "new" M-22W has the early style 2.56 1st gear, therefore, it does NOT have the same gear split of the later, more common M-20s. This makes the new M-22W slightly more compatable with rear gear ratios in the 2.73-3.55 range.
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GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963 ...
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C-M22 MODEL IDENTIFICATION(1969-1972) A-M20 B-M21 C-M22 ... The most well known Muncie transmissions are the M20(wide ratio), M21(close ratio), and the M22(rock crusher). Although not …
The M22 got a drain plug before any other Muncies. Once the 454s reached the option list with 500+ lbs/ft of torque, the need for a transmission that was equal to the challenge was called for, hence the M22 was specified for the LS5 & LS6 cars through 1972. Noise standards for 1973 lead to the demise of the M22, plus the 454 was getting its ...
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There are three basic types of Muncies: M20, M21 and M22. A Muncie differs from a Saginaw transmission in that its reverse lever is in the tail housing, not the side cover. …
I have scattered my share of muncies but never scattered the saginaw everyone thinks is so weak. the muncies need to be shimmed back on the input if you look at the gear mesh between the cluster gear and the others they only meet at about 75% shim them so the contact and they"ll last.A 10 bolt chevy pinion shim of .030 to .040 is …
1967-1970 M22 None. 1969-1974 M22 None. We said almost all Muncie transmissions had a groove(s) around the input shaft, and that is because most close-ratio Muncies will have one ring around the input shaft. But, those built between 1963 and 1965 will not have any rings around the input shaft.
1185 posts · Joined 1998. #3 · May 14, 2003. The M22 was a heavy duty version of the M21. M20 - wide ratio. M21 - close ratio. M22 - HD close ratio. Supposedly the M22 could take more abuse do to the design of the gears but noise was the big drawback and thus the name rockcrusher because thats what it sounds like is happening inside the …
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