So i have a 06 f150 stx 4.6l and wanted to see if i had limited slip or not.. was messing around in the rain the other day and wasnt sliding like i hoped.. did all the research i could cant find any info about it not original onwer and rear dif have marker on it so idk if it was a junkyard replacement or stock. Anyways tag reads top V802C bottom 55 88 5L16
googled V802C and google has 0 results... like how! Any help will be much appreciated must from videos i seen looks like an open dif.. no L between 55 but why is it 55... wouldnt that mean 5.5 ratio? Also cant find a 5.5 ratio dif so im clueless

 

Watch another video a guy showing a digit close to the bolt and i think i see one by the bolt it looks to be a 3... so id assume an open dif... damn.. no fun in the snow for me this winter i guess

 

Lucky you
8.8 and that L designates limited slip

 

Yeah, the bolt usually covers the first digits on the tag. If it says only 3 55, it would be open. The "L" later on the tag does not indicate LS, it's part of the build date code. IIRC, the 3.55 was not offered in an LS version for your truck.

If in doubt, it's easy to identify whether these axles are open or LS differentials. Just jack up the rear so both wheels are off the ground, put transmission in neutral, and rotate either of the rear wheels by hand while watching the other one. If it's an open diff, the other wheel will rotate in the opposite direction. If they both rotate the same direction, it's an LS.

 

I double checked and had that wrong
Good one SHO. you are right
The L must be in the ratio numbers to be a limited slip

Low quality screen shot photo

 

I bought a junkyard rear axle because I wanted to go from open to LS. The yard says it's a 99 with a LS. The tag on the axle says it's a limited slip and the axle code matches a 99 limited slip differential. However, I pulled the cover off and it loos like an open. Plus, when I rotate the wheels, they turn in opposite directions. So, did someone swap it out at some point or is it truly a limited slip. I want to be sure before I do the swap work

 

That means it an open differential

 

I figured it out. I was rotating the wheel backwards. When I rotate it forward. They go in the same direction so the tag is correct. I guess the clutch pack inside there somewhere.

 

Correct, there are clutches behind the side gears that the axles slide into.
It is most likely very worn.
The axles should turn together in either direction.

That wavy looking spring in the center adds pressure to the gears to partially engage the clutches, and torque from the driveshaft through the carrier and side gears on the center pin forces them to full engagement.

This is an open differential:

 

That is a limited slip axle with the S shaped spring
That spring puts pressure on the clutch packs
Your clutch packs need to be replaced if you can spin one wheel against the other with less than about 280 ft.lbs. of torque