700R4 GM in a Swinger?

The first gear is too steep like 3 to 1 if running 4.10 gears (which you can easily do with an OD trans. Then second gear is only 1.6 so it pull the motor down quite a bit on the 1 to 2 shift. Same on the 2 to 3 shift.

The old T.F. ratios of 2.45 and 1.45 work better but no OD