Hey, I have a few questions about the hydramatic in my 1950 Cadillac. When Im going up hills, it seems to lug in whatever higher gear its in, 3rd or 4th, and wont downshift, even if its wide open. Ive read I need to adjust the linkage on the carb but Im not sure which direction to move it and how much. If I accelerate rather quickly from a stop on flat ground it shifts smoothly through the gears. If Im light on the throttle, it seems to wind out 2nd and eventually clunk into 3rd. I have not checked the fluid. When I replace it, whats the most stock/proper fluid to use? Thanks everyone for your input.