OD shifting problems
It gets better as it warms up, but is quick to downshift to 4th on a slight grade or if I touch the gas pedal. It will cruise at 55 MPH and 2500 RPMs (4.10 gears) until I "coax" it to OD by tapping the gas.
I've had two different guys run tests, no codes show for engine or trans. The only thing not original (I own since new) are the cat-back duals. Had a tune-up, plugs & wires, air filter,6 months ago. Truck has 96,000 miles.
My gas mileage went from 15.5 to 12.5. Anyone have any ideas where to look next?
Help!



