Axle ratio ID
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Joined: Aug 2000
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Axle ratio ID
Pulled a third member from a 9" at the junkyard with no tag on it. the tag on the door said the axle type was "17". any thoughts? i know its an opened diff, and from spinning the pinion and counting teeth, i came up with a 3.5 ratio...but i couldve counted wrong. i put em in my truck that used to have 4.10's, and wow, they are comparatively very steep. lost a lot of off the line response but expect to see good milage gains.
Senior User
Joined: Mar 2001
Posts: 112
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From: South St. Paul, MN
Axle ratio ID
What year of truck did you pull the rear end out of. From what i was able to find on the vin decoder it said it was a 3.25 but its not for sure since I dont know the year of the truck.
1979 F150 CUSTOM 2WD 302 BORED .040 OVER EDELBROCK CAM, CARB AND INTAKE. C4 TRANNY AND A 9 INCH REAR END
1979 F150 CUSTOM 2WD 302 BORED .040 OVER EDELBROCK CAM, CARB AND INTAKE. C4 TRANNY AND A 9 INCH REAR END
FTE Chapter Leader
Joined: Sep 2000
Posts: 3,862
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From: Beachville, Ontario
Axle ratio ID
Count the teeth on both gears and divide the large number by the small number and that will give you your exact gear ratio regardless of what door sticker says, because gears may have been swapped before you got it.
1979 F150 Custom: nothing under the hood at all (again)
1987 F150 XLT Lariat: 88 351W EFI
75 351W: soon to have 91 heads, ?? cam, double roller timing chain, Edelbrock Performer intake & Holley carb and be put back in 79 F150
84 351W: waiting for ???
Chevy 454: waiting for a truck (Mazda?Nissan?)
1979 F150 Custom: nothing under the hood at all (again)
1987 F150 XLT Lariat: 88 351W EFI
75 351W: soon to have 91 heads, ?? cam, double roller timing chain, Edelbrock Performer intake & Holley carb and be put back in 79 F150
84 351W: waiting for ???
Chevy 454: waiting for a truck (Mazda?Nissan?)
