Greetings,

I've got a 2000 Expedition 4x4 4.6L .

Door code says I've got rear axle "H9".

Rear diff tags say 3L55 88, which indicates a 3.55 limited-slip 8.8" ring gear (if I'm correct).

But some of the information on F150 Online says that if you've got a 3.55 LS, it's a 9.75" ring gear **for certain**.

What gives? Am I the victim of misinformation, or an incorrect axle tag?

Thanks,

Best regards,

Tim ==

2000 Expy XLT 4x4
4.6L
3.55LS 8.8" ring
SuperChips MAX MicroTuner
FlowMaster Force II
Air filter box cutaway mod
WMS Racing Velocity Tube
K&N FilterCharger
Hellwig Anti-Sway Bar
Air Lift Company 1000 Load Assist Rear Springs
Troyer Performance underdrive pulleys
Flex-A-Lite dual-15" electric fan
Factory Tech 4R70W Valve Body
DRLs added with custom harness
AutoMeter electrical Transmission Temperature gauge
Alpine 9813
Polk db6500 in each door
Orion 275 SX
2x Orion Xtreme DVC 12" in sealed enclosure

 

The 8.8" differential is the result of your 4.6L engine. This is also why your Expy has a 4R70W transmission.

If you had a 5.4L engine, you'd also have a 4R100 transmission and a 9.75" differential.