The gear ratio on a 1986 Ford F-150 rear axle can vary depending on the specific model and options chosen. Common gear ratios for that year include 3.08, 3.55, and 3.73. To determine the exact gear ratio for a particular vehicle, you can check the axle code on the vehicle's door label or consult the rear axle's identification tag. Additionally, the gear ratio affects towing capacity and fuel efficiency, so it's an important specification to consider.
I am not positive about this but, I believe that this indicates that the axle has a 3.00:1 gear ratio. Check with you local Ford dealer for a definitive answer.
Mine is 3:55
On a 1986 Ford F-250 : I believe " 39 " is a conventional axle ( non limited slip ) with ( 3.55 gearing )
I believe axle code " 18 " is a 3.08 conventional axle ( non limited slip )
I believe that is 3.50
Open your drivers door and look at the information stickers , look for the axle code If you resubmit your question with the year of your F-150 and the axle code I'll try to look up the gear ratio - Helpfull
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Axle code 12 indicates a 2.73 conventional non positraction differential. Many people that tow a lot go with a 3.55 and those are axle codes 19, 29, 39, 49, and 69.
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On a 2003 Ford Explorer : Open the drivers door and there is an information sticker on the latch pillar You will find the axle code under " axle " Once you have the axle code you can determine the axle ratio