Greg B
Minnesota
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Joined: 07/28/2003
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Are the 19.5" wheels that come with the F450 any taller than what comes on the 3/4 and 1 tons? If they are, 3.73's could be a bit undergeared if theres much of a difference.
04 Dodge 1 ton dually, Cummins, auto, quad cab, 4x4, SLT, Sport, Reese Titan V
04 Lance 1161, TV/DVD, high efficiency A/C, Honda EU2000
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F450WHEELS
CA.
New Member
Joined: 09/28/2008
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Over all tire diameter is the same 32"
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9452772
Schertz, TX
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Joined: 03/03/2002
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I went from 3.73 to 4.10 and love it.
M&R
Schertz, Tx
2001 Ford F-250, 7.3, auto, long bed, 4x4
Autometer guages, 4" MBRP exhaust, AFE STAGE 2 intake
285/75-R16 BFG, 4.10 gears
2004 Nomad 2805
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F450WHEELS
CA.
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Joined: 09/28/2008
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ok, you love 4.10 gears, what do you pull?, what truck do you have?
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tmb4971
upstate SC
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Joined: 06/01/2006
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I just swapped my 3.73 to 4.10 in my 02 F-350. Dealership did the work for around 2000. I pull a 11,000# FW. Does a good job. I am wanting to sell the 3.73 gears. Not sure if they would fit in your truck though.
Tommy
Tommy & Sherry
2002 F350 Lariat 4x4 Ext Cab 7.3 Diesel w/Edge Attitude/4" exhaust
2008 Jayco Designer 31RLTS
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Engineer9860
Eagle Scout dad
Senior Member
Joined: 08/10/2003
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Are 3.73s even available for the rear axle in the F-450? The front shouldn't be a problem, but I haven't seen an F-450 with 3.73s, and that great big rear axle is only available on the F-450, and bigger trucks.
If it is a 6.0L PSD, I would recommend the 4.10s because the 6.0L PSD likes to rev a little anyway. It just feels like it has more giddy-up-go at the higher RPMs.
2002 Chevy 2500HD 4x4 8.1/ZF6sp RC/LB
2001 Chevy 2500HD 4x4 6.0/4L80E EC/SB
1997 Chevy Blazer 4x4
1994 Chevy K-2500 4x4 C6P 5.7/4L80E
1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454
30 year student of the Boeing B-17 Flying Fortress
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SoCalDesertRider
SanDiego, CA, USA
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Joined: 12/14/2003
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I would leave the axle gearing alone and instead add in a Gear Vendors overdrive unit. It bolts onto the end of the transmission (if 2wd) or transfer case (if 4wd). It is a mini automatic transmission with two gear ratios: direct 1:1 and overdrive 0.8:1. Doing the math, .8 x 4.88 = 3.90.
With the Gear Vendors, you have 2 trucks in one, a heavy puller with 4.88's when the OD unit is in direct gear and a freeway cruiser with 3.90's when the OD unit is overdrive gear. 
Check them out- Gear Vendors
92F350 CrewCab 4x4 351/C6
LoadNGo service body
69Bronco ATC250R CR500
20' BigTex flatbed carhauler
B&W TurnoverBall g-neck Curt Magnum rr DrawTite ft
HD springs Rancho9000s Bilsteins poly sway bushings
285/75-16E BFG AT on 16x8 Stocktons
4.56's & Lock-Rite rear
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F450WHEELS
CA.
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Joined: 09/28/2008
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I don't feel I need A gear vendor, too expensive, and anothere thing to fail.
yes 3.73 gears are available, and I have A 6.4
tmb4971 your gears wouldn't work.
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