My neighbor wishes to find what his rear end ratio on his 1999 F-250 SD with 7.3 diesel engine
Thank you for any help you might give

 

SHOULD BE A TAG ON REAR AXLE IF NOT JACK UP VEHICLE PLACE ON JACK STANDS TURN WHEEL ONE COMPLETE REVELOUTION WHIL SOMEONE COUNTS REVELOUTIONS OF DRIVESHAFT

 

Attached in the drivers door jamb/door there will be a VCL (vehicle certification label) that will have the truck axle code.. F250 shouldbe a 3:73.. Here's the complete M/Y listing.. The VCL has 'specific' build info, diff code/s, trans code, exterior color code, trim code/color (seating and interior color), brake, sping codes, as well as axle weight/s, GVWR ect..

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Axle Codes
The following lists the gear ratios on rear axles.

31 — 3.73 non-limited slip, F-250, single rear wheels
32 — 4.10 non-limited slip, F-250, single rear wheels
33 — 4.30 non-limited slip, F-250, single rear wheels
36 — 4.56 non-limited slip, F-250, single rear wheels
C1 — 3.73 limited slip, F-250, single rear wheels
C2 — 4.10 limited slip, F-250, single rear wheels
C3 — 4.30 limited slip, F-250, single rear wheels
C6 — 4.56 limited slip, F-250, single rear wheels
41 — 3.73 non-limited slip, F-350, single rear wheels
42 — 4.10 non-limited slip, F-350, single rear wheels
43 — 4.30 non-limited slip, F-350, single rear wheels
46 — 4.56 non-limited slip, F-350, single rear wheels
D1 — 3.73 limited slip, F-350, single rear wheels
D2 — 4.10 limited slip, F-350, single rear wheels
D3 — 4.30 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
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
F1 — 3.73 limited slip, F-350, dual rear wheels
F2 — 4.10 limited slip, F-350, dual rear wheels
F3 — 4.30 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, narrow frame, dual rear wheels
82 — 4.10 non-limited slip, F-350, narrow frame, dual rear wheels
83 — 4.30 non-limited slip, F-350, narrow frame, dual rear wheels
86 — 4.56 non-limited slip, F-350, narrow frame, dual rear wheels
88 — 4.88 non-limited slip, F-350, narrow frame, dual rear wheels
E1 — 3.73 limited slip, F-350, narrow frame, dual rear wheels
E2 — 4.10 limited slip, F-350, narrow frame, dual rear wheels
EW — 4.10 limited slip, F-350, narrow frame, dual rear wheels
E3 — 4.30 limited slip, F-350, narrow frame, dual rear wheels
E6 — 4.56 limited slip, F-350, narrow frame, dual rear wheels
78 — 4.88 non-limited slip, F-450, Chassis Cab, dual rear wheels
75 — 5.38 non-limited slip, F-450, Chassis Cab, dual rear wheels
G8 — 4.88 limited slip, F-450, Chassis Cab, dual rear wheels
G5 — 5.38 limited slip, F-450, Chassis Cab, dual rear wheels
GW — 4.10 limited slip, F-450, Chassis Cab, dual rear wheels
98 — 4.88 non-limited slip, F-550, Chassis Cab, dual rear wheels
95 — 5.38 non-limited slip, F-550, Chassis Cab, dual rear wheels
K8 — 4.88 limited slip, F-550, Chassis Cab, dual rear wheels
K5 — 5.38 limited slip, F-550, Chassis Cab, dual rear wheels
KW — 4.10 limited slip, F-550, Chassis Cab, dual rear wheels
75 — Dana 80, 11,000 pounds GVWR, F53 Recreational Stripped Chassis, Motorhome
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