Re: OT-Knocking noise in '99 F150

Posted by Gerald J. on April 16, 2007 at 09:09:03 from (67.0.103.129):

In Reply to: OT-Knocking noise in '99 F150 posted by 1 Dollar on April 15, 2007 at 18:50:15:

With the torque peak above 4000 rpm, the truck is geared wrong and you are shifting way too soon. The 4.6 L Triton (I drive a '98) loves to run 3 to 4K rpm and faster. You will probably get better gas mileage at higher engine speeds too. Its not a long stroke diesel, its a short stroke cross flow head gas engine. To pull trailers with mine, I swapped out the 3.08 gears for 4.10. Now I start unloaded and level in 2nd gear (can spin the tires if I open the trottle wide too soon), instead of first because the overall ratio in my 2nd gear is a little higher than it was in 1st gear originally.

I pull up to 4900 pounds of trailer load on occasion, though truck and wagon have weighed 11,000 pounds over the scale with some beans in the wagon.

The gas mileage at 50 to 60 mph speeds remains the same 16 mpg after the gear change as before (had about 28K miles when I did the gear change) but it drops off to 15 when I pull my 3000 pound Airstream at 50 or run lightly loaded on some interstates at 80 mph trying to keep up with traffic.

The rattle is lugging the engine, that's not all that good for it.

Gerald J.

Replies:

• Re: OT-Knocking noise in '99 F150 1 Dollar 17:14:11 04/16/07 (1)
  • Re: OT-Knocking noise in '99 F150 Gerald J. 20:51:25 04/16/07 (0)

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