Muncie 4-speed.

Case 1965-'67.
Tail housing early '65.
10-spline input shaft.
No rings on input shaft.
Can't tell # of splines on output shaft.

IF this is an original transmission, then it is a 1965 M20 wide-ratio.

That being said, on June 23rd, 1975, the owners of every Muncie transmission in the world took their transmissions apart at the same time, threw all the parts in a giant pile, then grabbed handfulls and reassembled new transmissions from whatever they happened to have, so you have no idea what is inside until you look.

- Eric

 

Thank you eric. With all that being said, is there any issue of hooking this to a 455?

 

It should, unless the engine is very powerful.

These transmissions were placed originally behind all sorts of GM big blocks, except for the very strongest, such as the LS-6 (which got the M22 Rock Crusher or the TH-400). The M22 was not, to my knowledge, offered on production Oldsmobiles, so the M20 or M21 should be plenty strong enough.

I personally think this transmission is a great choice, as the M21 close-ratio is too close for most normal driving, at least for my taste.

- Eric

 

Im going to pop it open sometime this week, Are there any right away indicators to tell from on the inside of what it is caring?

 

Google Muncie transmission identification.

You can count the teeth on the gears to see which ratio you have, and look at the angles of the teeth to see whether it's an M22 (it's obvious once you see it - the M22 is much straighter).

The odds are that this is an M20, mostly because that's the least desirable to hot rodders, but for that same reason, someone may have swapped the gears at a later date.

- Eric

 

Is your crank drilled for a pilot bearing?

 

Yup I had it drilled for one last summer