I have a OD trans in my duster, the gear ratios are not that desirable. The first gear is a 3.09 which is low and good for starting out, but 2nd is a big drop in rpm and same with third. I am likely going to put mt regular 4spd back in.
I have the A833OD and 3.55 gears behind a 360 (also had it behind a \6 for awhile). Anyway the gear spread is just not an issue for a street driven vehicle, even a \6. It may not be ideal for maximum acceleration but the 360 pulls the gear spread with no issue and I have run a very traction limited best of 13.7 secs @ 102 mph with a miserable 2.2 sec 60' time with it. Based on the trap speed the car has the potential to be a low 13 sec or possibly a high 12 performer with good traction off the line.
The ability to cruise on the hiway at 70 mph turning 2200 rpm while pulling down 22 mpg makes it all worth while.