39s and 4.56s with an SM465 would put you at about 2400 rpm at 60 mph, while 4.10s would put you at about 2100 rpm at 60 mph. Either way, you wouldn't want an OD transmission, and an SM465 would be your best selection, even with the diesel engine.
If you wanted more up and go, and had the money to spend, you could do 5.14 gears with an NV4500, and have both reasonable acceleration, and sit at about 2000 rpm in OD at 60 mph.
So, if you want to stick in the 4.xx gear ratio range, go SM465, if you want to go to the 5.xx gear ratio range, go NV4500.
The better you rear end gearing, the faster you can accelerate, the OD is just there to make the highway driving more reasonable.