i have a 2000 f250 cc and the back tag was removed and i am wondering if it has limited slip when i am going into my drive way sometimes one wheel will spin the next time both may spin and i am not sure if the ls is supposed to do that or not any help would be nice thanks

 

Jack up the rear end, put on jack stands. Place transmission in nuetral. Turn one of the wheels by hand. If the other turns the opposite direction it is an open differential. If they both spin the same direction it is a limited slip. There are more fun ways to check:
Jack up one side and try to drive off. If you can't it is an open differential.

 

Cross-reference the door tag with the tech sticky on this forum. Axle codes can be found there.

 

Axle Type
31 — 3.73 non-limited slip, F-250/Excursion
C1 — 3.73 limited slip, F-250/Excursion
32 — 4.10 non-limited slip, F-250
C2 — 4.10 limited slip, F-250/Excursion
33 — 4.30 non-limited slip, F-250
C3 — 4.30 limited slip, F-250/Excursion
36 — 4.56 non-limited slip, F-250
C6 — 4.56 limited slip, F-250

 

Axle Type
31 — 3.73 non-limited slip, F-250/Excursion
C1 — 3.73 limited slip, F-250/Excursion
32 — 4.10 non-limited slip, F-250
C2 — 4.10 limited slip, F-250/Excursion
33 — 4.30 non-limited slip, F-250
C3 — 4.30 limited slip, F-250/Excursion
36 — 4.56 non-limited slip, F-250
C6 — 4.56 limited slip, F-250
41 — 3.73 non-limited slip, F-350 (single rear wheels)
D1 — 3.73 limited slip, F-350 (single rear wheels)
42 — 4.10 non-limited slip, F-350 (single rear wheels)
D2 — 4.10 limited slip, F-350 (single rear wheels)
43 — 4.30 non-limited slip, F-350 (single rear wheels)
D3 — 4.30 limited slip, F-350 (single rear wheels)
46 — 4.56 non-limited slip, F-350 (single rear wheels)
D6 — 4.56 limited slip, F-350 (single rear wheels)
61 — 3.73 non-limited slip, F-350 (dual rear wheels)
F1 — 3.73 limited slip, F-350 (dual rear wheels)
62 — 4.10 non-limited slip, F-350 (dual rear wheels)
F2 — 4.10 limited slip, F-350 (dual rear wheels)
63 — 4.30 non-limited slip, F-350 (dual rear wheels)
66 — 4.56 non-limited slip, F-350 (dual rear wheels)
F6 — 4.56 limited slip, F-350 (dual rear wheels)
81 — 3.73 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
E1 — 3.73 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
82 — 4.10 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
E2 — 4.10 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
83 — 4.30 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
E3 — 4.30 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
86 — 4.56 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
E6 — 4.56 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
88 — 4.88 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
EW — 4.88 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
G3 — 4.30 limited slip, F-450 Chassis Cab
73 — 4.30 non-limited slip, F-450 Chassis Cab
78 — 4.88 non-limited slip, F-450 Chassis Cab
G8 — 4.88 limited slip, F-450 Chassis Cab
75 — 5.38 non-limited slip, F-450 Chassis Cab
G5 — 5.38 limited slip, F-450 Chassis Cab
GW — 4.10 limited slip, F-450 Chassis Cab
98 — 4.88 non-limited slip, F-550 Chassis Cab
K8 — 4.88 limited slip, F-550 Chassis Cab
95 — 5.38 non-limited slip, F-550 Chassis Cab
K5 — 5.38 limited slip, F-550 Chassis Cab
KW — 4.10 limited slip, F-550 Chassis Cab

 

Sounds like my LS, even when new. Replaced mine with a Tru-trac.

 

the tag does't have any codes on it that was the next place i looked after the rear end

 

Did you look on your vin on your door jamb it should say axle code there

 

did you like the true trac alot better?the factory l/s's suck.

 

Before people swap out their factory limited slip, I would first drain the diff and refill with your favorite gear oil and only 2 oz of friction modifier to start with. Add friction modifier in 2 oz increments until you no longer have clatter, but you have the limited slip action you like. Several people have reported being happy with only 2 to 4 oz of modifier as apposed to the 8 oz that Ford puts in from the factory. Mine worked fine from the factory, but ended up putting a Truetrac in after a bearing went bad in the diff and ate up the LS and gears. I like the Truetrac better than the stock LS, but the stock LS is not bad. The stock LS served me well all of these years plowing and I would still have it in my truck if the clutch pack hadn't been eaten up by that bearing.

 

i did change the fluid like everybody on here said it still just isn't tight enough.it is better tho.

 

bronco521 - yeah I have heard that. Results seem to vary for people. Mine worked perfectly from the factory whereas others like you can't get them to work no matter what you do. Even though mine worked great from the factory, the Truetrac was a step up and locks up very positive. No clatter or chirping whatsoever. I just figured it was best to let people to know that a fluid change could be all that they need instead of swapping out their LS.

 

As Ronin, I'm very happy with my Tru-trac, worth every penny. I took my truck to the dealer early on and complained about the lack of hook up. They put MORE anti-friction fluid in it.!!!!

 

Well they really have their act together there!!!

 

i want to get one but some one on here said the 05 and up f350's have a different spline count than the 250's and older sterlings.eventually i'll get one.