M-20 to M-21 swap question
#1
M-20 to M-21 swap question
What is involved other than just removing one & installing the other? I may want to make a change & want to know of any issues. The m-21 is out of a 68 going in a 69. Thanks
Tucker
Tucker
#2
Le Mans Master
All Muncie transmissions use the same case design, but I believe there were differences in the number of splines on the output shafts over different years.
If the M21 is from a different year than your M20 you may also have replace the slip yolk. I can't think of anything else that would be different though.
If the M21 is from a different year than your M20 you may also have replace the slip yolk. I can't think of anything else that would be different though.
#5
Le Mans Master
#6
Pro
68 and 69 should both be course spline. I think fine spline came in 71.
Ditto on M21 not best with tall rear gears unless it is a motor with plenty of low rpm torque.
Ditto on M21 not best with tall rear gears unless it is a motor with plenty of low rpm torque.
#8
Burning Brakes
The side cover is different between 68 and 69. In 68 they used a 3/8" (fine thread) male stud to attach the shifter arms. In 69 they went to a 3.8" (course thread) female "socket".
Ed
Ed
#9
Melting Slicks
#10
I have a like new m21 that liberty built for me with a steel mid plate and bushed main shaft. I also had them build me a wide ratio with the rock crusher maserio m22 gears, i tried both transmissions with 4.11, 4.33 and 4.56 rear gears. For the track, the only choice is the wide ratio, I would not even think of using the m21 with anything smaller than a 3.70. The wide ratio and the 4.56 was a handful. Ended up with the 4.33 and wide ratio . Anybody need an m21 26 spline big output trans?
#11
Great info guys. Thanks, I will have to do more research as I am going to pick the car up Monday or not based on my inspection. I am just trying to start my education on these cars now as I am going to be an owner soon. Thanks again
Tucker
ps Kevin nice to hear from you. Sorry my wife can't read a calender & we missed the last party. We are planning on coming down in May if the party is still on.
Tucker
ps Kevin nice to hear from you. Sorry my wife can't read a calender & we missed the last party. We are planning on coming down in May if the party is still on.
#12
Le Mans Master
Great info guys. Thanks, I will have to do more research as I am going to pick the car up Monday or not based on my inspection. I am just trying to start my education on these cars now as I am going to be an owner soon. Thanks again
Tucker
ps Kevin nice to hear from you. Sorry my wife can't read a calender & we missed the last party. We are planning on coming down in May if the party is still on.
Tucker
ps Kevin nice to hear from you. Sorry my wife can't read a calender & we missed the last party. We are planning on coming down in May if the party is still on.
I didn't even realize that was your post I was replying to.
Good to hear you might be getting a C3. Now you will be able to spend many fun filled hours laying on your back under a 40 year old car like I have been for the last few months.
Send us some pics when you get it.
BTW, The party is still on. Should be a really good time, although I will only be there for Sunday.