3 speed manual and 2.76 gears with /6

my5thmopar said
Just wondering if there was a a combo like this. 3 speed manual and 2.76 gears with /6. Im asking because I'm thinking of this combo with my 64 Utiline D100. No towing or hauling only driving.

What gear is in the D100 now? Maybe base it off that. You certainly don't want to be "double clutchin" to get her moving.