rear axle ratio

[IH_inside]

How is it that you tell the gear ratio from the sticker inside the door jam on a 99 super duty?
Thanks in advance!!

[Kanman]

On the door sticker youll see AXLE and then below it will give a code. Match that code to the list I have posted.

The following lists the gear ratios on rear axles.


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)
F1 - 3.73 limited slip, F-350 (dual rear wheels)
62 - 4.10 non-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.l0 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
75 - Dana 80, F53 Recreational Stripped Chassis (Motorhome)
95 - Dana 135, F53 Recreational Stripped Chassis (Motorhome)

[SmokeyWren]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: IH_inside</div><div class="ubbcode-body">How is it that you tell the gear ratio from the sticker inside the door jam on a 99 super duty? </div></div>
Kanman's way is the official way.

But if it's on topic in this forum, there's an easier way. If it's a '99-up SuperDuty pickup with single rear wheels (SRW) and diesel engine, then it has a 3.73 rear axle ratio.

[runum50]

My axle code is F2. I believe that is a limited slip 4.10. Does anyone know for sure what F2 is?

[klhansen]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: runum50</div><div class="ubbcode-body">My axle code is F2. I believe that is a limited slip 4.10. Does anyone know for sure what F2 is? </div></div>
Here's the code from the 99 service manual

F2 — 4.10 limited slip, F-350, dual rear wheels

[IH_inside]

Mine says E2 but is is not a chassis cab truck with the narrow axle. It is just a 350 DRW with a pickup bed. Wonder what that means? I have double and triple checked it too.