Are any of these trucks positive traction? Can someone tell me what the factory gear ratios are and how to find out what mine is?

 

Door tag axle code. If its a number and a letter then you have a limited slip.
the diff is a set of clutch packs and they are notorious for wearing out. If you have the limited slip then you can add a few ounces or friction modifier and possibly cure some of it if the wear isn't too bad.
Run a search for "door tag decoder" on here and you'll find a chart...id do it for ya but im on my phone and its not as easy.

 

19 — 3.55 non-limited slip — F-150
25 — 4.10 non-limited slip — F-150
26 — 3.73 non-limited slip — F-150/Mark LT
27 — 3.31 non-limited slip — F-150
B5 — 4.10 limited slip — F-150
B6 — 3.73 limited slip — F-150/Mark LT
H9 — 3.55 limited slip — F-150

Mine is a 3.55 with limited slip, hence the "H9" under "AXLE".



Happy Thanksgiving.

 

So these trucks were just limited slip, and none of them had a positrac rear end?

 

Correct limited slip or open only. 09+ has an electronic locker but its only used in 4wd. Model year 12 will have a 2wd elocker option.

 

Positrac is a G.m product. Name only
Limited slip is Fords name
Same thing

 

I checked mine, it is B6----3.73 limited slip.