That would be a good way to go. Only problem is the two speed axles give you a lower gear. What I need is a higher gear. I have a good two speed spare axle that would probably fit the Chev for my International KBS-5 but the high range is 6.33:1 which is considerably lower than the standard Chev diff. Maybe Chev produced a "highway" gear in the two speed, I will investigate further.
Warn overdrives used to be made for all the old Landcruiser gearboxes before 5 speeds were around
Old Toyota's were a copy of US chev motors except the had metric bolts
Maybe gearboxes were copied as well
Your better to die trying than live on your knees begging
All those Fairey and Warn boxes go on the back of a married transfer case (transfer bolted directly to the gearbox)
The Chev has the standard Chevrolet engine and gearbox like the normal 2WD truck then a jack shaft to the Transfer case under a cross-member well back. I will have to check but do not believe this transfer case can be added to with an overdrive unit. Therefore I need something to go between the standard box and the transfer case.
The best alternative of course is to stick a modern Borg Warner T5 overdrive 5 speed gearbox on and leave the rest of the drive train standard. I did this earlier this year with my Chevrolet 3/4 ton panel van I restored in USA then took to Normandy and it was outstanding. Only problem is although the T5 was on everything (Holden, Falcon, Jeep, Jaguar etc etc) you need one with a forward gear stick position off a Chevrolet S10 pick-up and not too many in Australia. Without that forward position the stick will come out under the seat in the truck cab.