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Gear Swap

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Old 11-30-2018, 08:29 PM
Mixerman90
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Gear Swap

Has anyone done an axle gear swap? I'm thinking of going from 3.73 to 4.10's now that I put 35" tires on. Were you happy with the results? Aprox cost? Thanks!
 
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Old 11-30-2018, 09:42 PM
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I didn’t do a swap, I ordered mine with 4.30’s. Best thing I ever did! My 17 with 35’s and 4.30s gets the exact same mileage as my 2011. Don’t mess with 4.10’s, go at least 4.30 or even 4.88.
 
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Old 11-30-2018, 09:55 PM
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I'm about to pull the trigger on a gear swap from 3.73 to 4.30. My local Ford dealer quoted me at $2300 plus tax. I'm hoping that they can do it for less and reuse the carrier bearings since it's a new truck.
 
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Old 12-01-2018, 01:21 PM
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Originally Posted by cob1181 View Post
I'm about to pull the trigger on a gear swap from 3.73 to 4.30. My local Ford dealer quoted me at $2300 plus tax. I'm hoping that they can do it for less and reuse the carrier bearings since it's a new truck.
Cool. Keep us posted here. I talked to my dealer Friday night and he's going to have an estimate for me next week. I was thinking 4.10's because with the larger tires they would put me right back where I was with the 3.73's and the smaller tires. What made you decide on 4.30's?
 
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Old 12-01-2018, 05:32 PM
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I decided on the 4.30 based on the advice of other members. Some even recommended 4.56 but it might be a long time until anyone makes them for the M275 rear end. Currently, I have 245/75r17 tires. If I go with taller tires, it will bring it down to a 4.10 ratio. My truck does fine towing with my current gears/tires, I just want it to be better off the line and holding gears on hills.
 
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Old 12-01-2018, 09:14 PM
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Iím on 37s and went from 3.73 to 4.88, which is about 4.50 effective ratio. I wouldnít waste money going from 3.73 to 4.30. Go to 4.56 or 4.88, itís not as big of a jump as it sounds. Better yet, get on some gearing calculators and do some math and see where you land with the different ratios. Itís an expensive swap so do your homework.
 
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Old 12-01-2018, 10:39 PM
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What size tires are you going with?
 
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Old 12-02-2018, 03:55 PM
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Going from 3.73 to 4.10 isn't enough to justify the cost on a gas engine. I would go with 4.56s if it was me.
 
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Old 12-03-2018, 06:16 PM
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Originally Posted by Rob495 View Post
What size tires are you going with?
I just put 35" BFG's on.
 
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Old 12-03-2018, 09:03 PM
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If anyone would like to sell off their 3.73 gear set, I would be interested. Shoot me a private message.
 
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Old 12-03-2018, 10:14 PM
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Swapping 3.73 to 4.10 isn't worth the cost. Go with at least 4.30 or go with 4.56.
 
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Old 12-04-2018, 12:23 PM
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Recently went from 37's to 38's. My ratio is a 3.73. I have never regeared a truck before but will I notice a huge difference going from 3.73 to say 4.56?
 
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Old 12-04-2018, 12:36 PM
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Originally Posted by motoxxxloak View Post
Recently went from 37's to 38's. My ratio is a 3.73. I have never regeared a truck before but will I notice a huge difference going from 3.73 to say 4.56?
Yes you will, but with 38s I would consider 4.88 or even 5.13 gears.
 
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Old 12-04-2018, 02:00 PM
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Originally Posted by 00t444e View Post
Yes you will, but with 38s I would consider 4.88 or even 5.13 gears.
Might be a stupid question but gears/re-gearing is foreign territory to me. If I re-gear to a high ratio and delete the truck (thus added HP/torque), will the gears support/last this?
 
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Old 12-04-2018, 03:41 PM
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Originally Posted by motoxxxloak View Post
Might be a stupid question but gears/re-gearing is foreign territory to me. If I re-gear to a high ratio and delete the truck (thus added HP/torque), will the gears support/last this?
So you have a diesel then I assume? That's changes things, diesels have a lower rpm operating range so they need higher (numerically lower) gears than a gas engine. I would do the power upgrades first then decide if you need to regear or not. I wouldn't run any lower than a 4.30.
 

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