There should be a metal tag under one of the bolts on the differential. It will have the ratio on it, and if like the earlier trucks, an "L" where the decimal point would be indicating a limited slip or locking axle.
I believe that if you look on the driver's door sticker there is a axle code. Mine is a 3H and it means that I have a 3.31 rear end. One thing is I have a E-locker and not a limited slip.
Something that is easier to read than the tag on the rear axle is a white label on the front axle. It should be on the back of the right axle tube and the ratio is at the top right. The only options for that truck would be a 3.31 or a 3.55.
And in case you do not know it, the tire size that comes with each largely offsets the impact of the different gear ratios. If you plan on tossing the oem rims and tires and opting for much larger tires or lift, most find the 3.55 works better.
There seem to be more complaints about the 20's wearing, but some have no problems with them.
You can download the Ford app called Ford Pass and enter the VIN on it. It accesses the Ford Oasis system. It will give you some info the same as an Oasis report but not in dept info of any visits to dealer that are logged.
is handy if sitting at home or weekend when dealer shop not open.
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