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Discussion in 'Transmission & Driveline Topics' started by Elfmaze, Dec 5, 2017.
If he drives it should make a pretty distinctive noise, no?
The M22 will have it's distinctive whine like no other tranny.
Right! what are the differences in an m22 vs an m21?
Worn out M20 and M21 gears can have the same whine.
Different angle of the gears
right, so theoretically a guy selling his car could try passing off a worn M21 for a "rock crusher" to make lemonaid out of lemons
if i did the math theoretically I should be able to tell a m20 from a m21/m22 by speed and rpm match.
Side note, a Speedo that works intermittently. is that usually a cable, guage, or trans issue?
Yeah. Stick it in first, tach to 2000 rpm (or whatever) and do the math (rear gear, tire size) to determine what the MPH should be with a 2.20 first gear or a 2.56 first gear. You would have to be right on on the tach. It's only a 16% difference in gearing.
Intermittent speedo could be cable. If it dry or binding, the cable can act like a big long spring. It will wind up and then release and the needle will bounce. The gears in the trans may be botched where a tooth is missing. Or it could be the gauge.
Diff is the angle cut on the gears. The M21/M22 ratio is the same where as the M20 differs in ratio due to the number of teeth.
M22 vs M20/M21
So just gears, no other strength changes such as shafts, etc?
A worn out M20/M21 will never sound like a M22. Someone
is smoking some real good chit to think that.
Put the trans is 2nd gear and remove the side cover and look .