410 rear end need to change to 373... Opinions - Ford Powerstroke Diesel Forum
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post #1 of 22 Old 02-05-2014, 12:03 AM Thread Starter
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410 rear end need to change to 373... Opinions

Hello, I am fairly new to the forum, I just bought a 2003 7.3 L crew cab duly F350. I have 410 gear ratio in the backend, and I am assuming it is the same for the front? Drove it home and 65 mph at 2600 rpm was horrible. I need to get better gears in the back end for highway speeds. Does anybody have any opinion where I should start with this? Should I go buy new ring and pinion gears and do it myself? Would it be easier to just find someone to trade axles with? Or would it be easier to take it to a diesel shop and have them do it? Thanks in advance for any help!!!!!
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post #2 of 22 Old 02-05-2014, 12:33 AM
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2600 rpm at 65 seems high for 4.10's.
im not 100% sure though.

at 70 mph with 3.73's im at 2000 rpm
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post #3 of 22 Old 02-05-2014, 12:37 AM
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Quote:
Originally Posted by bburt85 View Post
Hello, I am fairly new to the forum, I just bought a 2003 7.3 L crew cab duly F350. I have 410 gear ratio in the backend, and I am assuming it is the same for the front? Drove it home and 65 mph at 2600 rpm was horrible. I need to get better gears in the back end for highway speeds. Does anybody have any opinion where I should start with this? Should I go buy new ring and pinion gears and do it myself? Would it be easier to just find someone to trade axles with? Or would it be easier to take it to a diesel shop and have them do it? Thanks in advance for any help!!!!!
Take it to a shop and have new gears installed. Unless you have the right torque wrench and know how to set the lash on the pinion.


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post #4 of 22 Old 02-05-2014, 02:57 AM
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Best bet is to find somebody who wants the opposite, and trade them.

I bet youll be 2000$ to have to gears swapped for 3.73's.. but you can swap axles easy

Please check out my 7.3 Enthusiast Facebook group! All are welcome! LINKY

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post #5 of 22 Old 02-05-2014, 03:17 AM
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Changing your gears isn't something I would recommend DIY-ing, unless you have a hell of a shop. This will also cost you $1500-2000.

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post #6 of 22 Old 02-05-2014, 03:24 AM Thread Starter
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So does anyone know a good diesel shop in the Twin Cities Minnesota area preferably on the Eastside? How much do you think this will cost?
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post #7 of 22 Old 02-05-2014, 03:26 AM Thread Starter
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Just saw the cost in Zaairmans post. Thank you!!!
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post #8 of 22 Old 02-05-2014, 03:45 AM
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Like others are saying, I'd find someone with bigger tires that would want to swap. I can almost guarantee you could find someone that would jump at the chance!

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post #9 of 22 Old 02-05-2014, 05:03 AM
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I'm running the same gears with 245s on my dually and only turning 2300 at 70 mph. I reckon it could be the few mods I have to the engine making power at a lower RPM, not sure. I'd sure like to get mine to drop below 2k rpm, it'd make a lot better highway ride. Ring and pinion isn't that hard to change, but it MUST be set up right. Too loose, you break something; too tight, rear end will get hot and lock up which can be rough or deadly at interstate speeds. You have to have a good torque wrench, marking paint, a press, some type of puller, and a dial indicator in addition to normal stuff. Swapping axle assemblies is much simpler, I'm just not sure how easy it'd be to find dually axles with higher gears installed.

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post #10 of 22 Old 02-05-2014, 07:40 AM
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Since your truck is a 4x4 wouldnt putting the 3.73 gears in the back make those tires spin faster than the front tires when in 4wd?

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