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Look at the rear axle and there should be a tag under one of the bolts.
The tag will have three lines of numbers on it.
The bottom line has the ratio as the first set of numbers.
Usually the bolt head covers the first number of the ratio.
So the normal first numbers you should see are either .55 or .10 which would indicate an open 3.55 or 4.10 ratio.
If you see L55 or L10 you would have a limited slip 3.55 or 4.10 gear.
The transmission ID plate is on the drivers side about 1/2 way up the transmission and about in line with the shifter front to back.
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