Problems will not go away....

Prob'ly easiest way to be sure it's an OD at this point is jack up the rear wheels, and try the front lever and see which is faster at the rear. rotating the front shaft CCW puts it into 4th if it's a 4 speed or 3rd if it's a OD

So if CCW is faster than CW, == 4 speed

If CW is faster than CCW,== OD