There are quite a few options, but if you already have a T5 with OD….I’m not certain you really need different gears to cruise at 60 mph. Do you know what ratio you have now and what OD ratio you have? Tire diameter would be good to know as well.
I am not conversant in the 30s trucks and what axle width they are. AD pickups need rear ends in the 60 inch range. If your truck is similar…..
Nissan Hardbody pickups are close to right width and right bolt pattern
Nissan Frontier and XTerra are as well. Have to stay earlier side. Somewhere around 2005-6 they get wider.
Late 90s Isuzu rodeos had a 6 lug version of a GM 10 bolt. I’d love to have one as the gear ratios are almost infinite. They are getting scarce.
55-62 Chevy truck rear ends. Most are 3.90, but you can buy a 3.38 Ring and pinion.
63-69 Chevy truck rear ends. 12 bolt GM, and carry a few different ratios. 3.73 is super common.
