Shutter between 2nd and 3rd under normal Accel

[CodeBlue]

My dad has a 97 F-150 with 4.6L Automatic and when you accel from a stand still it will shutter between 2nd and 3rd. It doesn't do it under full throttle and doesn't occur every time. We are wondering if the tranny needs to be flushed or is it a engine problem such as plugs, wires, coil packs. The truck has 50000 miles on it. We would appreciate any help we can get Thanks MW ------------------ 2000 F-150 XLT, 5.4L, 3.55 Reg Axle Regular Cab Shortbed 2WD MODS K&N FIPK Kenwood CD and CD Changer Kenwood Door Speakers Flowmaster 40 Series Muffler (42541)

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[Y2K 7700 4x4]

Sounds like tranny's never had the oil changed.

First-line fix is to change fluid. Seems to help most who've posted on that issue before.

Some have had good luck with power-flush (where cooling line is hooked up to machine that catches old fluid as new stuff goes thru) -- and/but be sure to drain your converter and coolant lines too.

(post your results)

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Y2K™ Jim

Toreador Red, Keyless XLT SC SB 5.4L E4x4 4wDisc/ABS, 3.73LS, Skid, HD 7700# Towing, LT-245's on Chrome, Tube-Steps, Captain's, 6CD, Tonneau, named: "Nick"

[Mark Kovalsky]

The flush machine that connects in the cooler lines is a good way to change the fluid. It will change the fluid in the transmission, torque converter, and cooler lines.

Mark