Yes, it was an option.
A limited slip differential with 3.55 gearing , Ford , 3800 pound capacity
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.
Limited Slip Differential 3.55 gear ratio
I believe that is a 3.55 conventional axle ( non - limited slip )
That's Fords name for their limited slip differential
Open differential unless you ordered it from the factory.
( H6 ) - is a 3.73 limited slip differential on a Ford truck / SUV
I believe that is a limited slip differential with 3.55 gears
On the end of the drivers door on one of the information stickers you will see a 2 " character " axle code such as " 19 " ( which would be a 3.55 non - limited slip ) , " 18 " ( which would be a 3.08 non - limited slip ) " H9 " (3.55 limited slip ) " B6 " ( 3.73 limited slip ) The code is used to look up the type of differential and gear ratio
( H6 ) - is a 3.73 limited slip differential on a Ford truck / SUV
GM started offering Limited slip differential in 1957
The term "Non Limited Slip Differential" is Ford's way of telling you that your differential isn't special. A limited slip differential has clutches in it that stop a spinning wheel (the one that isn't getting traction) and send the power to the one that has traction, so the vehicle can get out of snow or mud. A non limited slip differential can only send power to one wheel at a time, which is the one with the least amount of rolling resistance (the one not getting traction).