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90 f150 5.0 Rear end ratio

Old 10-18-2018, 05:55 PM
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Default 90 f150 5.0 Rear end ratio

I have a 1990 F150 xlt lariat with a 302 and a AOD transmission. Non 4x4. My question is I'm trying to figure out my gear ratio in my stock rear end. However the previous owner removed the tag from the differential pannel. Any help would be greatly appreciated

Last edited by John Nix; 10-19-2018 at 12:00 PM. Reason: Added a photo
Old 10-19-2018, 11:28 AM
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Click this & read the caption:


(phone app link)


You can also chock the front wheels, put the trans in N, lift ONE rear tire, mark its position to the ground, and the d'shaft flange's position to the axle housing, rotate the tire exactly 2 revs, and count the d'shaft revs to get the ratio.
Old 10-19-2018, 11:38 AM
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[Thank you

QUOTE=Steve83;5953720]Click this & read the caption:


(phone app link)


You can also chock the front wheels, put the trans in N, lift ONE rear tire, mark its position to the ground, and the d'shaft flange's position to the axle housing, rotate the tire exactly 2 revs, and count the d'shaft revs to get the ratio.[/QUOTE]
Old 10-19-2018, 12:01 PM
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Default Here is what it says on my door


Old 10-19-2018, 09:33 PM
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OK Read that caption, and decode it.
Old 10-20-2018, 08:24 PM
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the axle code “19” is 3.55 open slip.


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