Gear Ratio.??
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Joined: Nov 2004
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Originally Posted by oggjay
Where on the truck does it state what Gear Ratio From the factory the truck came with...?? I'm missing the tags on the axle housings..
Thanks
Thanks
The axle information can be found on the door jam sticker at the driver's side.
The decode is as follows:
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
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Freshman User
Joined: Sep 2003
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So your saying every 2000 Ford Single axle Diesel 7.3 L, F350 Super Duty with a 6 Speed manual has 3.73 gears..??? Reason I ask is because my door tag says D2 which is 4.10 Limited Slip.. But removing the diff covers they have 3.73.. Very Confused..
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
Originally Posted by oggjay
So your saying every 2000 Ford Single axle Diesel 7.3 L, F350 Super Duty with a 6 Speed manual has 3.73 gears..??? Reason I ask is because my door tag says D2 which is 4.10 Limited Slip.. But removing the diff covers they have 3.73.. Very Confused..
Originally Posted by zontral
Are 3.73 gears good?
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Junior User
Joined: Oct 2005
Posts: 95
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From: Vancouver, BC
OK, im sorta new to all this gear stuff, what is the main difference between a 3.73 and a 4.10... My truck has D1 which is 3.73 limited slip. probably next spring i'll be doing some pulling, around the 8-10 thousand pound range, I'm guessing the 3.73 is perfectly fine for?? if this helps any with no load when im doing 100 Km/h (60 mph) im doing about 1900 rpm, and when I go to 110 km/h (im guessing thats close to 70 mph) im doing right around 2000 rpm.
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Post Fiend
Joined: Jul 2005
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From: 21791
the number is actuall 3.73:1, and 4.10:1. a 3.73 ratio means the driveshaft will spin 3.73 times for the axle (wheel) to make one full revolution. a numerically lower number is better for fuel mileage, and torque is lost through the driveline. a higher number will make the engine spin faster at any speed than one lower than it. our 4.88 F-550 is good for towing, it is about 2500 rpm at 60mph, our 4:30 dually (tows) is about 2050 rpm at 60mph, and my 3.73 F-350 is about 1800 rpm.
Junior User
Joined: Oct 2005
Posts: 95
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From: Vancouver, BC
Cool, now I know what gears I have. And I really love my truck, it has the auto tranny but I like it, when im pulling about 8000 pounds going up little rolling hills it doesn't shift down at all. Only when im going up some bigger long hills it just shifts out of the overdrive or whatever and it just goes holding whatever speed I have cruise on. Truly a great truck. First Ford and I will never go to anything else.
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