The front differential is an "open" differential. No limited slip components there.
The gear ratio is 3.60:1, this is for the front limited slip differential.
F-150 has never had a locking differential until the 2009 F-150 FX4 model. Only choices before the 2009MY was a limited slip or open differential.
Is my 2002 Chevy Tahoe a slip differential or a limited slip differential
To find out if the vehicle has limited slip differential, check the tag in the glove box. If the tag has the code DSA or says the gear ratio with the words limited slip, it does.
GM started offering Limited slip differential in 1957
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The 01 ram 2500 has a possy rear end. it depends if it was ordered with a limited slip carrier. the diffs do not come with lockers. if it has a tow package it most likely has a a limited slip.
Fill to refill plug, and up to 2 quarts. 75W-140 GL4 with 4oz slip additive.
75w90. Limited slip requires an additive.