I have a stock 1949 3100 1/2 ton with a 216 engine, and would like to convert it to a more efficient transmission. I am looking for a 4 or 5 speed with a higher ratio than the stock 1:1. Any ideas on what can be easily attached to the stock bell housing. I realize I will probably have to replace the rear end, so I would also like suggestions on what could be used with the stock 6 lug 16" rims.