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Discussion in 'Transmission & Driveline Topics' started by gorilla, Feb 18, 2018.
Just wondering if the same drive shaft from the Turbo 350 trans will work with the M20 set up.
Depends on what year. In 70-earlier the Muncies had the same output shaft as the 350 turbo. 71-later Muncies moved to the 400 turbo output shaft size. Length may also be a bit different.
Thank you for this information. I will look at the splines and all that and make an determination.
You don’t even have to count the splines, the Th400 yoke is noticeably larger in diameter.
M20 & M21 use the "smaller" Powerglide/T350/TH200/700R4 yoke. M22 uses the larger TH400 yoke.
70-74 M22 had the large output shaft
71-74 M20 and M21 had the large output
Large output is the same as the Th400
These had the 26 spline input as well
Not so sure.
I believe that in 70 ONLY the LS-6 Chevelle M22 had the large output shaft. All other 70 M22's had the small output shaft.
Can somebody confirm? Did 70 Z28's or L78' (the only two Camaro's you could get an M22 with) have the large or small output shaft? This also goes for the input shaft. I believe that the fine spline input shaft was only on the LS-6 Chevelles in 70. In 71, it was across the board on all Muncie 4 speeds. Basically, the LS-6 got the beefed up M22 a year before the others.
Maybe I am confusing the input shaft changes with the output shaft.
gorilla do you have the M20 already, what is the spline count on the front and rear?
If not, these things are old so verify what you are buying.
Reason I say this is - have a '68 M22 sitting on the shelf. Everything is date code correct, It has a T350 output but I did research at one point and discovered it isn't too much trouble to change over to T400 output. Economical? Probably not.
You are correct on the LS6 Chevelle being the only one to get the fine spline and large output shaft in 70
To go from TH350 to TH400 output, a bunch of stuff would need to be changed, as well as a complete disassembly.
Main shaft,tail housing,reverse gear, come to mind.
It would be easier and less expensive to change the slip yoke on the driveshaft
I changed from 350 to m21 and the drive shaft fit right in. No cutting or joint changes were needed.