I know up to a 96 will be a direct replacement. Is there a newer gearbox that will bolt to the frame and column and only require a pitman arm change? If so what combination? I will also look at ford based motor homes at salvage yard as they should have a lot lower mileage. Another option is rebuild mine with new input and output shafts. Any area where to buy the parts? Trying to look at all my options. If I go with red or blue top I will also be about the core as mine does not appear to be OEM.