Transmission ID???
Thread Starter
Instructor
Joined: Jul 2004
Posts: 211
Likes: 2
From: Houston Texas
Transmission ID???
I have a '70 L-46 that has the original engine and, I was told, original transmission. When looking to purchase the car, I checked the engine, but not the transmission. I was expecting an M21, but once I disassembled the car for resto-mod I found its an M22.
What's confusing me is that according to "Corvette by the Numbers" this is a '65 M22. Thebook states that there were 57 1965 M22 transmissions built. My questions are 1. Is the reference to 57 M22s for corvette-installed M22s?; 2. Is there any way to determine whether this M22 is from a vette as opposed to coming from a different model?; and 3. In that I'm interested in putting in a 5-speed, what range of resale value is there? Thanks!
What's confusing me is that according to "Corvette by the Numbers" this is a '65 M22. Thebook states that there were 57 1965 M22 transmissions built. My questions are 1. Is the reference to 57 M22s for corvette-installed M22s?; 2. Is there any way to determine whether this M22 is from a vette as opposed to coming from a different model?; and 3. In that I'm interested in putting in a 5-speed, what range of resale value is there? Thanks!
Melting Slicks
Joined: Mar 2005
Posts: 2,093
Likes: 297
From: Midlothian VA
Thread Starter
Instructor
Joined: Jul 2004
Posts: 211
Likes: 2
From: Houston Texas
Per the book, based on the exterior codes it should be a M22 or M21. However, the book cites that from '63 to '69 the only Muncie transmission drilled for a drain plug was the M22. Prior to taking the car aparrt, when I drove the car the transmission had a pronounced whine. Additionally, it also has a 10 spline input, 26 spline output, and no groove.
I understand that's not a very iron-clad case, but that's sort of why I started asking questions. The information I've found doesn't seem very definitive for this time period. Not knowing anything about transmissions, I didn't want to open up the case. However, I just went ahead and did it. It looked to me that the gear teeth are somewhere near 45 degrees. As such, I imagine if it is an M22 case that the gear set has been swapped. Any thoughts? I'm mostly wanting information on what to do with it once I've replaced it. In that it's not original I have no desire to keep it so I need to have an idea of what it is. BTW, I'm still interested about the use of '65 M22s. In looking into this I've seen websites that don't list M22s until '67.
I understand that's not a very iron-clad case, but that's sort of why I started asking questions. The information I've found doesn't seem very definitive for this time period. Not knowing anything about transmissions, I didn't want to open up the case. However, I just went ahead and did it. It looked to me that the gear teeth are somewhere near 45 degrees. As such, I imagine if it is an M22 case that the gear set has been swapped. Any thoughts? I'm mostly wanting information on what to do with it once I've replaced it. In that it's not original I have no desire to keep it so I need to have an idea of what it is. BTW, I'm still interested about the use of '65 M22s. In looking into this I've seen websites that don't list M22s until '67.
Melting Slicks
Joined: Mar 2005
Posts: 2,093
Likes: 297
From: Midlothian VA
Per the book, based on the exterior codes it should be a M22 or M21. However, the book cites that from '63 to '69 the only Muncie transmission drilled for a drain plug was the M22. Prior to taking the car aparrt, when I drove the car the transmission had a pronounced whine. Additionally, it also has a 10 spline input, 26 spline output, and no groove.
I understand that's not a very iron-clad case, but that's sort of why I started asking questions. The information I've found doesn't seem very definitive for this time period. Not knowing anything about transmissions, I didn't want to open up the case. However, I just went ahead and did it. It looked to me that the gear teeth are somewhere near 45 degrees. As such, I imagine if it is an M22 case that the gear set has been swapped. Any thoughts? I'm mostly wanting information on what to do with it once I've replaced it. In that it's not original I have no desire to keep it so I need to have an idea of what it is. BTW, I'm still interested about the use of '65 M22s. In looking into this I've seen websites that don't list M22s until '67.
I understand that's not a very iron-clad case, but that's sort of why I started asking questions. The information I've found doesn't seem very definitive for this time period. Not knowing anything about transmissions, I didn't want to open up the case. However, I just went ahead and did it. It looked to me that the gear teeth are somewhere near 45 degrees. As such, I imagine if it is an M22 case that the gear set has been swapped. Any thoughts? I'm mostly wanting information on what to do with it once I've replaced it. In that it's not original I have no desire to keep it so I need to have an idea of what it is. BTW, I'm still interested about the use of '65 M22s. In looking into this I've seen websites that don't list M22s until '67.
Still looks more like an M20. You could tell M20/M21 by the tooth count OR by simply turning the input shaft and figuring out the gear ratio.
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