OK, best of luck. CPP does not design or build anything. They simply sell parts and kits manufactured by others. This box is an aftermarket replacement copied from a 84-87 Toyota 4x4. I can buy this unit from numerous suppliers in this area and none of them are from CPP. I have installed 5 of them so If you don't wish to heed the advice, that's well & good.
Fred

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine