NOW,FIRST THINGS FIRST!
Get our your wire brush or wire wheel & clean off that rust on your input shaft RIGHT NOW! Get some oil on it,ASAP!
Shame on you!
Seriously,I don't believe that transmission is the original for your 77 W72.
As I recall,the "correct one" should have only TWO cuts in the input shaft spline. (2:64 low gear)
FIVE cuts in the input spline will net you a 3:?? low gear. (need to check my charts on that one)
Those ones were generally put behind the smaller cube/lower HP motors to make them seem faster.
The 1/2" x 3" pad on the top of trans. in your first picture should have a partial vin stamped on it & I'm betting it AIN'T yours.
Does your 77 still have it's original 3:23 rear axle?
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