What does the ring and pinion set do for a truck? i own a 95 ford f-150 extended cab 5.8L 351 windsor. its an automatic. im ready-ing to put a 6" lift in it with 35s but i don't know what type of axle my truck has on it? no special mods on it. any help?

 

Put simple a ring and pinion take the rotation of the driveline and turns it 90 degrees to spin the axle. The gear ratio determines how fast the driveline spins in regards to the axle tire setup. If you go with larger tires you will see a decrease in torque and fuel economy. There are numerous calculators that will allow you to determine the proper gear ratio based on the new tire compared to the old.

 

alright i see, thanks alot that helps. wait one more thing, proper gear ratios even applies with automatic transmission?

 

Even more so than with standards, the automatics will overheat and burn the fluid easier than burning the clutch on a standard. Automatics have higher gears in them than a standard, the extra multiplication is via slippage in the converter. With larger tires and not regearing you will be closer to the stall in the converter every time you start out. Stalling the converter produces lots of heat breaking down the tranny fluid, burning clutches and causing mayhem.

 

you should re-gear if you going that high with those tires