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I was looking at the 1999 Ford F-150 owners manual and with the 5.4 liter V8 engine ( according to the trailer towing table ) there were ( 3 ) gear ratios

( 3.08 / 3.55 / and 3.73 )

I believe if you open the driver's door you will see an information sticker on the end of the door or the latch pillar that will show the axle code . The axle code will let you determine the gear ratio ( unfortunately they don't seem to have that in the owner's manual ) so I did a Google search of Ford axle codes.

I BELIEVE :

axle code ( 18 ) is a 3.08 conventional ( non limited slip )

axle code ( 19 ) is a 3.55 conventional and H9 is a 3.55 limited slip

axle code ( B6 ) is a 3.73 limited slip

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Q: What is the gear ratio on a 1999 F 150 5.4?
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