what auto od should i use?

[coggonobrien]

building my 68 swb 3/4 4x4. engine will be a multi-port efi 396, running 4 inches of lift, 36x12.5 bias ply tires, dana 44/60 dodge 3/4 ton axles and will pull a flatbed trailer for vehicles/scrapping/seed corn/beans on occasion. I've heard the 700r4 doesn't fair well with pulling down the highway. should I build a 4l80e? if so what one's will match my bell housing and how should I control it?

Thanks,
David