I'm interested to know if higher ring and pinion gears can be put into a 1942 1.5 ton Military 4x4 (front and back of course)without changing the housing. Right now it has a top speed of 45 mph and although I'm not worried about being run-over on the freeway, I don't want to look in the rear view mirror and see pile-ups behind me. Know what I mean?

So can this truck be made more roadworthy in today's driving conditions?