I have a 2000 Eddie Bauer 5.4L. The door sticker says H9 for the axle code. Which should be a 3.55 limited slip.

The tag on the rear diff cover says xL55 9 75 (the X has been permanently obscured by the cover bolt but I can make out what appears to be the lower part of a 3). Which also points to being a 3.55 limited slip.

However, I took the cover off to change the fluid and saw this:


Unfortunately the carrier was oriented this way so I couldnt get a better shot, but I didn't see anything between the spider gears:


If this is a limited slip, it's unlike any limited slip I'm familiar with.

Or did an open diff get installed at some point?

 

If you turn one of the rear wheels forward does the other turn backwards?

 

I will find where i got this from but check the Axle code on the door. I THINK it was blue oval but will double check.

Axle Code
(Door Sticker)
Axle Capacity Gear Ratio
Year / Vehicle

01 Ford 9" 2800 2.75
02 Ford 9" 2800 3.00
04 Ford 9" 2800 3.25
07 Ford 9" 2800 2.47
12 Ford 3800 2.73 1991
13 Ford 9" 3750 2.75 1981-1983
13 Ford 8.8 4.11 1985-1986
14 Ford 9" 3750 3.00 1981-1986
15 Ford 9" 3750 3.25 1981-1982
15 Ford 3.31
15 Ford 9" 3750 2.73 1983
16 Ford 9" 3750 3.50
16 Ford 3.73
17 Ford 3300 3.25 1971
17 Ford 3800 3.31 1995 / 1999-2002 / Expedition
17 Ford 3.55 1998
17 Ford 3.73 1997
17 Ford 9" 3750 2.47
18 Ford 8.8 3800 3.08 1983-1986
19 Ford 8.8 3800 3.55 1983-1986 / Expedition
22 Dana 5300 4.10
23 Dana 60 5300 3.54
24 Dana 60 5300 3.73 Econoline
25 Ford 5300 4.10 1991
25 Dana 60 5300 3.33
26 Ford 4050 3.55
26 3.73 F-250
27 3.31 F-250
27 Ford 5300 3.73
27 Dana 70 7400 4.10
28 Dana 70 7400 4.56
29 Ford 10.25" 5300 3.55 1991
31 Dana 6250 3.07
31 3.73 F-250 / Excursion
32 Dana 6250 4.10 Econoline
32 Dana 61 5300 3.00
33 Dana 61 6250 3.54
33 Ford 4.30 F-250
34 3.73 Econoline
35 4.09 Econoline
35 Ford 6250 4.10 1991
36 Dana 70 7400 3.73 1980
36 4.56 F-250
37 Dana 60 5300 3.54
38 Ford 6250 3.08
38 Dana 60 5300 3.73
39 Ford 10.25 6250 3.55 1991 Econoline
41 Dana 6250 3.54
41 3.73 F-350
42 Dana 6250 3.73
42 Dana 7400 4.10
43 Dana 7400 3.54
43 Dana 6250 4.10
43 4.30 F-350
44 Dana 6250 4.56
45 Ford 7400 4.10 1991
46 4.56 F-350
49 Ford 10.25 7400 3.55 1991
51 Dana 70 HD 7400 3.73
52 Dana 70 HD 7400 4.10 Econoline
53 Dana 70 HD 7400 4.56 1982
53 Dana 70 HD 7400 3.54 1983-1986
56 4.10 Econoline
61 3.73 F-350
62 Dana 8100 4.10
63 Dana 8200 3.54
63 4.30 F-350
65 Ford 8250 4.10 1991
66 4.56 F-350
69 Ford 10.25 8250 3.25
69 Ford 8250 3.55 1991
72 Dana 6300 4.10
72 Dana 11000 4.63
73 Dana 6300 3.54
73 Dana 11000 5.13
73 4.30 F-450
75 5.38 F-450
78 4.88 F-450
81 3.73
81 4.63 Econoline
82 4.10 F-350
83 4.30 F-350
86 4.56 F-350
88 4.88 F-350
95 5.38 F-550
98 4.88 F-550
B2 Dana 5300 4.10
B3 Dana 5300 3.54
B4 Dana 5300 3.73
B5 Dana 60 - Limited Slip 5300 3.33
B5 Ford 10.25 - Limited Slip 4.10
B6 Ford - Limited Slip 5300 3.55
B6 Ford - Limited Slip 3.73
B7 Ford - Limited Slip 5300 3.73
B9 Ford 10.25 - Limited Slip 3.55
C1 Ford - Limited Slip 3.73 F-250 / Excursion
C2 Dana 61 - Limited Slip 5300 3.00
C2 Dana 61 - Limited Slip 5300 3.54
C2 Dana - Limited Slip 6250 4.10 F-250 / Excursion
C3 Dana Limited Slip 6250 3.54
C3 Ford - Limited Slip 4.30 F-250 / Excursion
C5 Ford 10.25 - Limited Slip 4.10
C6 Ford - Limited Slip 4.56 F-250
C7 Dana 60 - Limited Slip 5300 3.54
C9 Ford 10.25 - Limited Slip 3.55
D1 Limited Slip 3.73 F-350
D2 Limited Slip 7400 4.10
D3 Ford Limited Slip 3.54
D3 Dana - Limited Slip 6250 4.10
D3 4.30 F-350
D5 Ford 10.25 - Limited Slip 7400 4.10
D6 Limited Slip 4.56 F-350
D7 Dana 70 - Limited Slip 5300 4.10
E1 Ford - Limited Slip 3.73
E2 Dana 70 HD - Limited Slip 7400 4.10
E3 Limited Slip 4.30 F-350
E5 Ford Limited Slip 8200 4.10
E6 Limited Slip 4.56 F-350
EW Limited Slip 4.88 F-350
F1 Limited Slip 3.73 F-350
F2 Limited Slip 4.10 F-350
F3 Limited Slip 4.30 F-350
F5 Ford 10.25 -Limited Slip 8250 4.10
F6 Limited Slip 4.56 F-350
F9 Ford Limited Slip 8250 3.55
G2 Dana Limited Slip 6300 4.10
G3 Dana Limited Slip 6300 3.54
G3 Limited Slip 4.30 F-450
G5 Limited Slip 5.38 F-450
G8 Limited Slip 4.88 F-450
GW Limited Slip 4.10 F-450
H3 Ford 9" Limited Slip 3750 2.75 1981-1982
H3 Ford 8.8 Limited Slip 3800 4.11 1985-1986
H4 Ford 9" Limited Slip 3750 3.00 1981-1986
H5 Ford 9" Limited Slip 3750 3.25 1981-1982
H5 Ford Limited Slip 3.31
H5 Ford 9" Limited Slip 3750 2.73 1983
H5 Ford Limited Slip 3800 4.10 1991
H6 Ford 9" Limited Slip 3750 3.50
H6 3.73 Expedition
H7 Ford 9" Limited Slip 3750 2.47
H7 Ford 8.8" Limited Slip 3800 3.31 1995 / Expedition
H8 Ford 8.8" Limited Slip 3800 3.08 1983-1986
H9 Ford 8.8" Limited Slip 3800 3.55 1983-1986 / Expedition
K5 Limited Slip 5.38 F-550
K8 Limited Slip 4.88 F-550
KW Limited Slip 4.10 F-550
L6 Electric Locker 3.73 2011
W5 Ford - Limited Slip 8250 4.10 1995

 

^^ that list doesn't make much sense. I know the diff is a 9.75 not an 8.8, yet an H9 (which is what I have) is listed as an 8.8.

 

Not sure what you were expecting to see.
The clutch packs, one on each side, are outboard of the diff side gears.

 

Thanks. Normally I see them between the spider gears. I didn't know if that was a shim or a clutch disc.

 

Did you do as Alloro suggested above? Problem solved.

 

Haven't had a chance. If it's LS, should both turn the same direction or one the opposite direction?

I'm skeptical this test will reveal anything: the speed at which I can turn the wheel by hand is probably not a speed that would kick the clutch in. I've done this test on known open diffs in the past and the opposite wheel turns the opposite direction.

 

Standard rear they will spin opposite, with a LS they will spin only the same way (unless the clutch packs are toast).

 

So it is the LS. Only the 8.8 has something between the spider gears (the "S" preload spring). The 9.75 and 10.5 don't.