Rearend ratios and other questions - Ford Powerstroke Diesel Forum
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Old 01-01-2007, 06:41 PM
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Rearend ratios and other questions

Is there anywhere that has a list of what rearends were available in the 7.3Ls? I'm assuming that 3.73 is pretty common, but I was also wondering how you can tell one way or another. I'm a GM convert and I'm used to decoding RPOs to tell me what options were on a particular vehicle. Does Ford have a similar system so that I could look up all the options on a truck from the VIN or some other ID number on the truck?
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Old 01-02-2007, 08:45 AM
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not absolutley sure but i believe 3.55's and 4.10's for towing. i know ford has run these gears in a lot of the truck's they built in the 80's and 90's. i haven't seen alot of 3.73's in fullsize ford trucks. if you have the axle tag it'll tell you what gears you have usually has some letters and then the gear ration wit more letters if it has a L/S. another good way to check is pull the diff cover and count the ring/pinion teeth. hope this helps......
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Old 01-02-2007, 09:14 AM
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Actually, I think the 3.73's were the most common. Mine has it and everyone I know back home with a 99-03 PSD has 'em. IIRC the other gears were options....like the 3.73LSD was an option. Just my $0.02.
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Old 01-02-2007, 09:39 AM
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my front diff is the 3.73 but i am not quite sure what i have in the rear. probly the same the tags have worn off the back and mine is a 99.
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Old 01-02-2007, 11:27 AM
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Not sure if I found this here or not, but I copied it down

The first three vehicle identification number (VIN) positions are the world manufacturer code.
1FD — Ford Motor Company, USA, incomplete vehicle
1FM — Ford Motor Company, USA, multi-purpose vehicle
1FT — Ford Motor Company, USA, truck, completed vehicle
2FM — Ford Motor Company, Canada, multi-purpose vehicle
3FD — Ford Motor Company, Mexico, incomplete vehicle

The fourth VIN position is the vehicle brake type and GVWR code (all vehicles use hydraulic brakes).
N — 8,501-9,000 pounds GVWR with driver and front passenger air bags
S — 9,001-10,000 pounds GVWR with driver and front passenger air bags
W — 10,001-14,000 pounds GVWR with driver and front passenger air bags
X — 14,001-16,000 pounds GVWR with driver and front passenger air bags
A — 16,001-19,500 pounds GVWR with driver and front passenger air bags
H — 8,501-9,000 pounds GVWR, without air bags (Mexico)
J — 9,000-10,000 pounds GVWR, without air bags (Mexico)
K — 10,001-14,000 pounds GVWR, without air bags (Mexico)
L — 14,001-16,000 pounds GVWR, without air bags (Mexico)
M — 16,001-19,500 pounds GVWR, without air bags (Mexico)

Positions 5 through 7 indicate vehicle line, series and body type.
F20 — F-250, Regular Cab, 4x2, single rear wheels
X20 — F-250, SuperCab, 4x2, single rear wheels
W20 — F-250, Crew Cab, 4x2, single rear wheels
F21 — F-250, Regular Cab, 4x4, single rear wheels
X21 — F-250, SuperCab, 4x4, single rear wheels
W21 — F-250, Crew Cab, 4x4, single rear wheels
F30 — F-350, Regular Cab, 4x2, single rear wheels
X30 — F-350, SuperCab, 4x2, single rear wheels
W30 — F-350, Crew Cab, 4x2, single rear wheels
F31 — F-350, Regular Cab, 4x4, single rear wheels
X31 — F-350, SuperCab, 4x4, single rear wheels
W31 — F-350, Crew Cab, 4x4, single rear wheels
F32 — F-350, Regular Cab, 4x2, dual rear wheels
X32 — F-350, SuperCab, 4x2, dual rear wheels
W32 — F-350, Crew Cab, 4x2, dual rear wheels
F33 — F-350, Regular Cab, 4x4, dual rear wheels
X33 — F-350, SuperCab, 4x4, dual rear wheels
W33 — F-350, Crew Cab, 4x4, dual rear wheels
F34 — F-350, Regular Cab (Chassis Cab), 4x2, single rear wheels
X34 — F-350, SuperCab (Chassis Cab), 4x2, single rear wheels
W34 — F-350, Crew Cab (Chassis Cab), 4x2, single rear wheels
F35 — F-350, Regular Cab (Chassis Cab), 4x4, single rear wheels
X35 — F-350, SuperCab (Chassis Cab), 4x4, single rear wheels
W35 — F-350, Crew Cab (Chassis Cab), 4x4, single rear wheels
F36 — F-350, Regular Cab (Chassis Cab), 4x2, dual rear wheels
X36 — F-350, SuperCab (Chassis Cab), 4x2, dual rear wheels
W36 — F-350, Crew Cab (Chassis Cab), 4x2, dual rear wheels
F37 — F-350, Regular Cab (Chassis Cab), 4x4, dual rear wheels
X37 — F-350, SuperCab (Chassis Cab), 4x4, dual rear wheels
W37 — F-350, Crew Cab (Chassis Cab), 4x4, dual rear wheels
F46 — F-450, Regular Cab (Chassis Cab), 4x2
W46 — F-450, Crew Cab (Chassis Cab), 4x2
W42 — F-450, Crew Cab (with box), 4x2, dual rear wheels
W43 — F-450, Crew Cab (with box), 4x4, dual rear wheels
F47 — F-450, Regular Cab (Chassis Cab), 4x4
W47 — F-450, Crew Cab (Chassis Cab), 4x4
F56 — F-550, Regular Cab (Chassis Cab), 4x2
W56 — F-550, Crew Cab (Chassis Cab), 4x2
F57 — F-550, Regular Cab (Chassis Cab), 4x4
X46 — F-450, SuperCab (Chassis Cab), 4x2
X47 — F-450, SuperCab (Chassis Cab), 4x4
X56 — F-550, SuperCab (Chassis Cab), 4x2
X57 — F-550, SuperCab (Chassis Cab), 4x4
W57 — F-550, Crew Cab, (Chassis Cab), 4x4
U40 — Excursion, 4x2, XLT
U41 — Excursion, four-door, 4x4, XLT
U42 — Excursion, four-door, 4x2, Limited
U43 — Excursion, four-door, 4x4, Limited

The eighth VIN position is the engine displacement and number of cylinders.
L — 5.4L, Modular, SOHC, EFI, V8, Gas
S — 6.8L, SOHC, EFI, V10, Gas
F — 7.3L, OHV, DI Turbo, V8, Diesel
Z — 6.8L, gaseous fuel prep (F-Series)
D — 6.8L, propane only (F-Series)
B — 5.4L, propane only (F-Series)

The ninth VIN position is a government assigned, computer-generated check digit.

The tenth VIN position is the model year code.
· 2 — 2002

The eleventh VIN position is the assembly plant code.
S — Allen Park (Allen Park, Michigan)
E — Kentucky Truck (Jefferson County, Kentucky)
M — Cuautitlan (Cuautitlan, Mexico)

The last six VIN positions are an alphanumeric code for the vehicle build sequence. This is also the vehicle serial and warranty number.
· A0000-E99999 — Ford Division
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Old 01-02-2007, 11:27 AM
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Here is the rest


VEHICLE CERTIFICATION LABEL:

Exterior paint codes may be listed as a two-part code. The first set of characters listed indicate the vehicle primary body color code. The second set of characters listed (if applicable) indicated a two-tone or accent body color code.
AQ — Arizona Beige (clear coat), F-Series
BY — School Bus Yellow, Mexico sold only, F-Series
CX — Dark Shadow Gray (clear coat), F-Series
F1 — Vermilion Red (clear coat), F-Series
EP — Vermilion Red Solid, Mexico sold only, F-Series
FN — Dark Toreador Red, F-Series
GX — Dark Toreador Red, Mexico sold only, F-Series
L2 — True Blue (clear coat)
LR — Sapphire Blue (clear coat), F-Series
PB — Jewel Green, Mexico sold only, F-Series
PK — Chesapeake Blue, Mexico sold only, F-Series
PY — Highland Green (waterborne), F-Series
UD — Ebony, F-Series
TX — Bright Silver, Mexico sold only, F-Series
YO — Oxford White, Mexico sold only, F-Series
Z1 — Oxford White, Mexico build U.S. sold, F-Series
Z1 — Oxford White (clear coat), F-Series
Z3 — Silver Metallic (clear coat), F-Series
FL — Toreador Red, Excursion
JP — Silver Birch Metallic, Excursion
LD — Medium Wedgewood Blue, Excursion
P5 — Aspen Green, Excursion
ST — Estate Green, Excursion
TK — Mineral Gray, Excursion
UA — Ebony, Excursion
YZ — Oxford White, Excursion

Wheelbase
137 — 137-inch wheelbase (F-Series, Excursion)
141 — 141-inch wheelbase (F-Series)
142 — 142-inch wheelbase (F-Series)
156 — 156-inch wheelbase (F-Series)
158 — 158-inch wheelbase (F-Series)
162 — 162-inch wheelbase (F-Series)
165 — 165-inch wheelbase (F-Series)
172 — 172-inch wheelbase (F-Series)
176 — 176-inch wheelbase (F-Series)
189 — 189-inch wheelbase (F-Series)
200 — 200-inch wheelbase (F-Series)
201 — 201-inch wheelbase (F-Series)

Brake Type
B — Four-wheel anti-lock brakes system (ABS)

Interior trim codes are listed as a two-part code. The first character listed identifies the trim type. The second character listed identifies the interior trim color.

Interior Trim Type
K — Knitted vinyl bench seat, F-Series
C — Cloth bench seat, F-Series
F — Cloth captains chairs, Excursion
F — Flight bench seat, Mexico sold F-Series XLT only
G — High back cloth individual seats, F-Series
H — High back knitted vinyl individual seats, F-Series
J — High back vinyl individual seats, F-Series
3 — Cloth 40/20/40 seats, F-Series/Excursion
D — Cloth 40/20/40 seats with integrated restraints, F-Series
8 — Leather 40/20/40 seats, F-Series
9 — Leather 40/20/40 seats with integrated restraints, F-Series
2 — Cloth captains chairs, F-Series
6 — Cloth captains chairs with integrated restraints, F-Series
4 — Leather captains chairs, F-Series/Excursion
7 — Leather captains chairs with integrated restraints, F-Series
5 — Leather quad captains chairs, F-Series
L — Leather captains chairs, Excursion Limited
B —Leather captains chairs with vinyl rear bench, F-Series
M—Cloth 40/20/40 seats with rear bench mono. F-Series
P—Leather captains chairs with vinyl rear bench, F-Series
Interior Trim Color
H — Medium Parchment, F-Series
E — Medium Flint, F-Series/Excursion
B—Ebony, F-Series
D—Dark Flint, F-Series

Tape/Paint Stripe (TP/PS)
D — Light Argent/Medium Platinum/Light Argent, F-Series XLT
E — Arizona Beige/Dark Sandalwood/Arizona Beige, F-Series
F — Wild Strawberry/Dark Shadow Gray/Wild Strawberry, F-Series

Radio Type
7 — AM/FM stereo with clock, F-Series
G — Delete AM/FM stereo with clock, all other components installed, F-Series
9 — AM/FM stereo with cassette and clock, F-Series/Excursion
R — Delete AM/FM stereo with cassette and clock, all other components installed, F-Series
K — AM/FM stereo with cassette and compact disc player, F-Series/Excursion
Y — Delete standard AM radio with clock, F-Series
1 — AM/FM stereo with cassette and in-dash six disc compact disc (CD) changer, F-Series/Excursion

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

Transmission Type
E — Four-speed automatic overdrive (4R100), gasoline engines, F-Series/Excursion
9 — Four-speed automatic overdrive (4R100), diesel engine, F-Series/Excursion
6 — Six-speed manual, Dana ZF (M6HD-6), F-Series
5 — Six-speed manual, F-Series (5.4L, 6.8L Gas)
2 — Five-speed manual, F-Series (5.4L, 6.8L Gas/LPG), Mexico only

Springs
Springs codes are listed as a two-part code. The first character listed is for the front springs. The second code listed is for the rear springs. Auxiliary rear springs may also be listed.

Front Springs — F-Series
Base part number — 5310 (RH/LH)
Pre-fix — F81A
B — Suffix BA
C — Suffix CA
D — Suffix DA
E — Suffix EA
F — Suffix FA
G — Suffix GA
H — Suffix HA
I — Suffix RA
J — Suffix SA
K — Suffix TA
L — Suffix UA
Pre-fix — 1C34
S — Suffix AAA
T — Suffix ABA
U — Suffix ACA
V — Suffix ADA
W — Suffix AEA
X — Suffix AFA
Front Springs — Excursion
Base part number — 5310 (RH/LH)
Pre-fix — YC35
G — Suffix G
H — Suffix H
S — Suffix S
Pre-fix — 1C34
AG
AH
AJ
Rear Springs — F-Series
L — Rear air suspension
B — 1C34-5560-CB, F-250, F-350
C — 1C35-5560-DB, F-250, F-350
D — YC35-5560-EA, F-250, F-350
M — YC35-5A975-AA, F-450, F-550
N — YC35-5A975-BA, F-450, F-550
Auxiliary Springs — F-Series
A — YC35-5588-A (wide frame)
D — F81A-5588-D (narrow frame)
Rear Springs — Excursion
Base part number — 5560 (RH/LH)
Pre-fix — YC35
A — Suffix A
Pre-fix — 1C34
B — Suffix B
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  #7  
Old 01-02-2007, 11:31 AM
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Thanks a lot!
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  #8  
Old 01-02-2007, 02:58 PM
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Man.... that's a lot of info you compiled! AWESOME!

Last edited by Ditty; 01-02-2007 at 02:59 PM. Reason: I'm an idiot
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Old 01-02-2007, 03:27 PM
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All SRW trucks have a Sterling 10.25 and all to my knowledge came with 3.73's (99+ superduties).

All DRW trucks have Dana 80's and most came with 4.10's. (TowBoss not included)

I have seen people say their dually has 3.73's, and others say their SRW F350 came with 4.10's...
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  #10  
Old 01-02-2007, 04:33 PM
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Dang, that's commitment!

Someone should make that sticky for reff.
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