Balderdash. The tires shipped with the vehicle from the factory were chosen to be the CHEAPEST they could buy. Not the greatest for performance. Nor even the ones they set the speedometer gears for in some cases. My dad had an '86 F150 that the speedometer read about 10% fast. He got great mileage, he thought, because it also registered 10% more miles than mile posts and he drove it gently. When I bought it the next set of tires I picked to calibrate the speedometer and there were a couple sizes taller to achieve that.
The '98 F150 I have now has manual transmission and came with 3.08 gears. Wouldn't pull the hat off your head nor any trailer over 2200 pounds. Had to start in first gear on level ground unloaded because of a close ratio transmission. One way to get more thrust for trailer starting would have been to change to 24" diameter tires in place of the about 30" it came with. I changed the rear axle gears to 4.10 and kept the stock tire size for ground clearance. I changed the speedometer sensor driven gear to correct the calibration which became computer adjustable later in that model year. Didn't change the gas mileage, unless I run it up in the low 80s per hour and it pulls good. Has great throttle response. It was geared wrong for the engine that is one that peaks out at high rpms. I rated it at 4700 pounds trailer and I have weighed truck and wagon at 11,000 pounds over the scale.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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