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If its in that 88 F-350:
10.25" with either 3.73s or 4.10s(jack up rearend, make mark on u-joint and axle housing and on tire and on the axle tube;count how many times the driveshaft turns to make the tire turn once)
size is harder because you have to pull the diff cover
Am I wrong in assuming that the gear ration for front and rear axles is the same. If it is, doesn't my truck have a Dana 60 front? If that's true, isn't the ratio 4.56? Or am I just totally lacking any conception here?
Well, it took me forever, but I found it. Yipee-ki-yay.
[link:www.drivetrain.com/Fordtrkratio_posidata.html|Axle Ratio]
You can look at the AXLE code on the bottom line of the VIN sticker in the door jamb (if it's a 4-door, it'll be on the back edge of the driver's door). Post it and someone will decode it for you.
Dana axles can be decoded here:
http://www2.dana.com/Expert/wc.dll?DSD~demenu~DEMENUA~
This may help, too:
http://www.visteon.com/technology/automotive/solidindependent_axle_spec.shtml
Hi to tell if it is a dana 60 look on the top of the outside of the axles where the u joint is all that steering stuff ( whats the word im looking for its been a long day) there will be a sqaure box with four bolts in it thats a dana 60