'97 PS dually can I swap gears to 3.73's ? - Diesel Forum - TheDieselStop.com
Power Strokes 1994-1997 Upgrades and Aftermarket Upgrading or adding OEM or aftermarket equipment to your 1994-1997 Ford F-Series with Power Stroke engine.

 
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post #1 of 5 (permalink) Old 08-15-2018, 05:46 PM Thread Starter
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'97 PS dually can I swap gears to 3.73's ?

Just bought a 1997 F350 PSD / Automatic super cab dually and it has a 4.10 limited slip rear differential. Since I will not be pulling anything heavier than my 8000 pound 5th wheel I was wondering if it is possible and a good idea to swap in a set of 3.73 gears? I might pull this trailer once or twice a year short distances (less than 500 miles). Other than that it will be pulling cars and light trucks on a car trailer.


I bought the truck because I did not believe it to be a good idea to do the job with my 2002 F150 Supercrew with a 5.4 / automatic / 4x4 with 3.73 limited slip differentials. Correct me if I'm wrong.



Thanks, Andy in KY

1988 F350 CC Dually, 7.3 w/Banks Turbo Charger, 4:10 Gears, 37' fifth wheel, daily driver
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post #2 of 5 (permalink) Old 02-26-2019, 12:40 PM
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I did on my 96. Went from 4:11 to 3:55. Wish i would of done 3:73 and still may. Ordered new ring and pinion and everything from Youkon. Works great! The rear end is a Sterling 10.25.

1996 F350 CC 2wd Dually. ZF5 swap,DIY Efuel,99 IC, 147k miles OBS Proud!
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post #3 of 5 (permalink) Old 02-27-2019, 12:19 AM
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What's the weight of the car trailer and how many cars or light trucks does it carry?

2001 F350 XLT 4X4 crew cab, dual rear wheels, long bed, black, 7.3l turbo diesel, automatic transmission, 4.10, shift on the fly, running boards, sliding rear window, 38 gal fuel tank, Odyssey extreme 65-PC1750T batteries, Michelin LTX-MS2 rear tires, Sumitomo Encounter front tires, Shell Rotella Ultra elc, 11,500 gvwr, 20,000 gcwr, 7500 gvw, completely stock, 114,000 miles when purchased, now has 250,000 miles, repairs so far: two starters, batteries, cps, brakes, tires, alternator, ball joints, locking hub, wheel hub, AC compressor, serpentine belt, power steering pump, driver's side window, ignition switch, o-ring, Spectra premium radiator, water pump, fan clutch, fan blades, thermostat, thermostat housing, tensioner. Stolen twice so far, but recovered both times with major damage.

2005 Nomad Rampage toyhauler made by Skyline. 11,500lb gvwr.
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post #4 of 5 (permalink) Old 02-27-2019, 12:32 AM
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Quote:
Originally Posted by Bigjake View Post
I did on my 96. Went from 4:11 to 3:55. Wish i would of done 3:73 and still may. Ordered new ring and pinion and everything from Youkon. Works great! The rear end is a Sterling 10.25.
The dually rear axle may be a Dana 80. Most likely not a Sterling (Ford) 10.25. Those were only SRW axles used on F250 & F350.
But that doesn't mean that taller gears wouldn't be available for the OP's truck.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
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post #5 of 5 (permalink) Old 02-27-2019, 07:30 PM
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F350 Dually axles were Sterling 10.25 (mine was at least). I think the F450 Super Duty OBS may have been the Dana 80. Cheers!

97 F250 SC 4x4 (CA model), E4OD, 4.10 LS,
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SOLD: 94 F350 CC DRW, 5 Speed, SBC Con-O,
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