4.10 GEARS TO 3.73 OR 3.54 - Ford Powerstroke Diesel Forum
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Old 09-15-2009, 03:47 PM
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Cool 4.10 GEARS TO 3.73 OR 3.54

Any opinons if I take my 4.10 to 3.73 or 3.54 gears have to change front and back pain but lower rpms I hope would much increase mpg.???
Anyone know of a 2 speed rear end for this 2005 f-350 dully maybe have the 4.10 for towing and 3.73 or 3.54 gears for everday drivin.???
Jer-1

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Old 09-18-2009, 01:20 PM
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Originally Posted by JER-1 View Post
Anyone know of a 2 speed rear end for this 2005 f-350 dully maybe have the 4.10 for towing and 3.73 or 3.54 gears for everday drivin.???
Jer-1

A 2 speed rear gear would be awesome!!....but I have never heard of such a beast for a truck this small.


I do know that gearvendors sells a double OD option.....but don't think it will work on our 4x4's tho.

GearVendors
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Old 09-26-2009, 07:25 PM
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you can make the gearvendors OD work...you just cant run it in 4 wheel.....either way it just goes behind your trans, or in this case the transfer case.
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Old 09-26-2009, 07:33 PM
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Quote:
Originally Posted by JER-1 View Post
Any opinons if I take my 4.10 to 3.73 or 3.54 gears have to change front and back pain but lower rpms I hope would much increase mpg.???
Anyone know of a 2 speed rear end for this 2005 f-350 dully maybe have the 4.10 for towing and 3.73 or 3.54 gears for everday drivin.???
Jer-1

you're a freakin genius. Patent it!
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Old 10-21-2009, 09:37 AM
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fixing to drop some 3.73 in my 99... i will let you know how it turns out. There is already a pretty good discussion for the same subject lower down the page on 7.3 drivetrain section. Got me some Yukon 3.73 gears for 350 bucks. I have heard of people doing 3.73 in rear and leaving 4.10 in front. just make sure you dont run it on hard surface like that.
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Old 10-21-2009, 09:52 AM
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you shouldnt run two diff. gears in a 4wd. it will **** up the transfer case
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Old 12-04-2009, 08:16 PM
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4.10 to 3.73 is only a 250 OD RPM diff. 4.10 to 3.54/5 is a 500 RPM diff w/ OD. I know I did this. took a 2 weeks between switching axles ( had 2 laying around) End result:...........waiting for my gear vendors unit:-D
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Old 12-05-2009, 04:17 PM
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Cool

Why the gear venders if you droped 500 rpm on the 3.55 gears
That should have uped the fuel milage a lot
JER-1
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Old 12-05-2009, 04:23 PM
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Quote:
Originally Posted by cowboyf250 View Post
you shouldnt run two diff. gears in a 4wd. it will **** up the transfer case
It will only F up the transfer case if you put it in 4wd...
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Old 12-05-2009, 05:18 PM
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Originally Posted by topdwg View Post
It will only F up the transfer case if you put it in 4wd...
yup.. when I bought my last truck the guy had 4.10s in back and 3.73 up front. it would pop and jam up every rotation. definitely wouldn't leave it like that in case you need the 4x4
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