I have a 99 ford expedetion with a 5.4 auto tran and 3.55 gears what is the towing capacity thanks for the info

yorttroy:

I looked in my owners manual, and it does not show specs for a 5.4L with the 3.55 Rear Axle Ratio (that ratio is only shown on the 4.6L) but here is the full breakdown. Mine is a '97 Eddie Bauer and they may have made some axel ratio changes in those two years.

ENGINE / Rear Axel Ratio / Tire Size / MAX GCWR / MAX Trailer Weight

4.6L (4X2) / 3.31 / 16 in / 11,000 lbs / 5,900 lbs
5.4L (4X2) / 3.31 / 16 in / 12,000 lbs / 6,700 lbs
5.4L (4X2) / 3.73 / 16 in / 13,500 lbs / 8,000 lbs

4.6L (4X4) / 3.55 / 16 in / 11,500 lbs / 6,100 lbs
4.6L (4X4) / 3.55 / 17 in / 11,000 lbs / 5,500 lbs
5.4L (4X4) / 3.31 / 16 in / 12,000 lbs / 6,400 lbs
5.4L (4X4) / 3.73 / 16 in / 13,500 lbs / 7,900 lbs
5.4L (4X4) / 3.73 / 17 in / 13,000 lbs / 7,400 lbs

I don't know if this will help you out or not, but it may get you pretty close.