Changing 4.11 gear ratio to 3.73 - Ford Powerstroke Diesel Forum

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post #1 of 11 Old 12-09-2007, 10:59 AM Thread Starter
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Changing 4.11 gear ratio to 3.73

Hello Everybody,
I am new to this and I am impressed by vast available information. I have 1999 F 350, 7.3 engine, dual tires, automatic transmission with 4.11 gear ratio. Until now, i was planning on changing the gear ratio to 3.73 by myself however given the complication and the special tools required, I don't think i will do it.
I live in Riverside CA and wondering if any of you know of a reputable differantial repair shop around here [not necessarily in Riverside, a shop as far as 150-200 miles away from Riverside is OK]

I thank you in advance,
Isa
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post #2 of 11 Old 12-09-2007, 11:09 AM
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hey bud im here in the san fernando valley

i know of a place around here that does gears..... ill be doing mine early next year with them.... ill find the name and number and post it up
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post #3 of 11 Old 12-09-2007, 11:12 AM
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here you go bud... they are called Hoopers...

Hooper's Rear End Exchange Inc.

12201 Branford St
Sun Valley, CA 91352

let me know if you have any other questions

-Raul
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post #4 of 11 Old 12-09-2007, 12:58 PM Thread Starter
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hello Raul,
Thanks for the info, they are not that far from where I live, on Monday I will give them a call, and will go from there.
Thanks again for the help,
Isa
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post #5 of 11 Old 12-09-2007, 01:22 PM
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Isa, I don't think you should change the gears..I think you should lift it and slammed some huge tires under there..take advantage of them 4.11s..I wish my truck had 4.11s..I wouldn't be thinking of changing my gears haha..Im just kidding with ya thou man..Hope it all works out good for you..oh and BTW Raul is hands down one of the nicest, coolest people on this forum that I have met. He really knows his stuff and will ALWAYS help you out.

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post #6 of 11 Old 12-09-2007, 07:06 PM Thread Starter
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Evan, the lifting is not a bad idea, but i have a slide in camper that use whenever i go camping, so lifting i think would be little risky with the camper!! I am changing to 3.73 largely to save on the gas. I rarely pull something with my truck and only thing i haul is the camper--which is 3000 lbs- so i figured if i go with 3.73 or even 3.55 i would make more mileage per gallon. Currently, truck makes 60 miles at 2000 rpm and i read on some websites that they recommend Ford pst's go at 60 miles with as much as at 1400 rpm.
Of course, I just don't know how the engine/automatic transmission would handle when you force it to go with that low rpm.
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post #7 of 11 Old 12-10-2007, 02:14 PM
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I hope you have been able to get the information you are seeking and welcome to the org!

Granny aka Terri
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post #8 of 11 Old 12-10-2007, 02:20 PM
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Just for your information, 3.73 gears with 34" tall tires on my 06 runs just over 75 mph at 2000 rpm in overdrive. The 3.73 is a decent all around gear, but if you do a lot of stop and go driving it won't net you any better mpg. Also unless you run over 60 mph most of the time it won't do a whole lot better. They don't like being in O/D under 60 mph unless you have really flat ground.

Just a little food for thought. It will take several years worth of fuel savings to pay for the gear swap.
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post #9 of 11 Old 12-10-2007, 02:27 PM
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post #10 of 11 Old 12-10-2007, 02:27 PM
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I love my 3.73 gears. With 265/75r16 wheels, I am around 70MPH at 2000 RPMs. This weekend on my trip to Louisiana, I got 20-21MPG at that speed.

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