I just bought an 84 4x4 and all seems to be well except I have to run engine RPM way up to get it to shift. Is this a governor problem or am I missing something simple? I plan on changing fluids and filters and adding a shift kit just to be safe. I'm only adding the shift kit because I plan on towing a 14' fiberglass boat, motor and trailer. I will also add a tranny cooler.