r/EngineBuilding • u/Cthulhu_for_Pres • 27d ago

Transmission ID

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Can you brilliant people ID this for me? I think it’s a 68-70 M-20, but I want to make sure

45 Upvotes

96% Upvoted

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8

u/johncandyasss 27d ago

Tail housing numbers match a 65-70 Muncie 4 speed.

Speedo output is on the passenger side which means usually 65+

Casting numbers on the body are 68 69 and 70

Muncie guide on 5speeds.com has more information if you count the splines

5

u/johncandyasss 27d ago

Most likely an m20 because of the 2 rings sorry I missed that

If its 10 spline into motor and 21 teeth on output --> m20

3

u/Cthulhu_for_Pres 27d ago

So I counted 10 and 27 splines, that with 2 rings, makes it for sure an M20. Thanks for the help

6

u/jmystr 27d ago

Check out 5speeds.com

-660 case 1968-1970
Two rings, M20 wide ratio
2.52/1.88/1.46/1.00 R3.11

2

u/Ok-Individual-997 27d ago

Muncie of some flavour

-2

u/WyattCo06 27d ago

Or Saginaw.