I was just wondering how do I find out if my FX4 has a locked rear? We bought it used so I have no clue lol Thanks,Ron

 

Fully locked? It doesn't

A limited slip? Two ways
1) The white door tag on your driver's door should have 2 digits under the axle code. A number AND a letter is Limited slip. Two numbers is an open diff.
2) There is a metal tag attached to the right side of the rear axle. If "LS" is stamped right after a 3 in a series of numbers, then you have a limited slip.

A locking axle wasn't available from the factory in the F150 until the 09+ models.

 

PM me your VIN and email address...I should be able to come up with a copy of your original window sticker.

 

^^^^ that's another way to find out.

Such a nice fella, that Ken.

EDIT: with a 2006 FX4, i'm willing to gamble that you have a B6 code, which is a 3.73 Limited Slip.

 

Well I know when I got my new exhaust i smoked my tires just i little bit and both of them were smoking but then last night i got in some snow on only one spun which confused me

 

A limited slip will still provide enough power to both wheels to get them to spin. It's dependant upon a bunch of variables, like road conditions, turning radius, etc. Mine with a 3.73LS will break them loose too. If one spun in the snow...it's not locked.

 

Ok. The one thing that confused me is we got 5 inches of snow saturday and the roads were horrible and when i was sitting in 4x4 at a redlight and took off all 4 spun lol

 

Not surprised. Not difficult to get 4 tires to lose traction with 365lb/ft of torque and less than ideal conditions. Sounds like the truck is working like it should.

 

Ok man. And it has 40,000 miles and the previous owner never left blacktop not one time. Me the first week I had it it went from black to brown lol

 

Tried to rep you for the help offered Ken, but I gave you reps not too long ago and have to spread it around first.

Stewart

 

Thanks Stewart.

 

Axel code is H9?

 

Based on Chandlers info, you have a limited slip diff.

Stewart

 

You have a VERY RARE example of a FX4 that has a 3.55 rear end. Not many came that way. You have a 3.55 limited slip.

 

Good rare or bad rare??? And whats the diff of the 3.73 and 3.55?