rear differential question

[POWER-STROKER250]

hey guys i have a quick question to ask, just bought an 08 f250 psd and i'm trying to figure out whether or not it has a limited slip or just a one tire fire. did a burn out the other day and it only lit one tire up but when i launched it, it spun both tires. any help would be great!

[POWER-STROKER250]

it is two wheel drive also

[new2diesel59]

sure it has a lim slip, the brakes prob held the left side tire till you launched

[44magnum]

Ford axle codes I think you can find the axle code on the door tag as well, but I'm not sure if its the same code, but I would assume so. You may or may not have one, they weren't std. The LS in these truck are know for being worthless, Also remember its not a full locker so don't expect the it to act like one.

[turbo kidd]

Fords limited slip sucks.....sometimes it works, sometimes it doesn't. Total joke. I have mine checked every time my truck goes in for service....I do it just to make sure there is documentation, so when it fails, Ford, can fix it.

[POWER-STROKER250]

gotcha okay i'll get the axle code and check it out, thanks for the help guys!

[POWER-STROKER250]

well according to the door code i have 4.10 ratio gears and its a non-limited slip. thanks again!

[MD05]

Originally Posted by turbo kidd

Fords limited slip sucks.....sometimes it works, sometimes it doesn't. Total joke. I have mine checked every time my truck goes in for service....I do it just to make sure there is documentation, so when it fails, Ford, can fix it.

Question what is the dealer checking? is he actually pulling the cover and measureing the clutch discs? Or just checking that the fluid is correct?

Fords LS unit is a clutch type, they normally need to be replaced aroudn 25-30K miles. Beat on it and they need to be done sooner. They have used the same design since I can't remember when. It is not a lockup type, and depending on loading one wheel will slip while the other tries to get power.

Tru-trac is a better unit to upgrade to as it uses gears not clutches. The 450/550 D110 are Gear type LS units. I have 78K on my rig and the LS unit works just fine, but then again I do not drag race the machine just work it for what she is. Occasionally I can spin one wheel but the other will generally apply some power to the ground and get me moving.