Regearing a 2017 4x4 - Question
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Tuned
Joined: Jan 2015
Posts: 472
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From: Southeast Wisconsin
Regearing a 2017 4x4 - Question
Thanks in advance your input...I have a 2017 4x4 with 3:31 gears from factory.
I would like to gear down to 4:30 or lower.
Question 1: Do I NEED to regear front as well if I intend to disconnect front driveshaft ? I have NEVER used 4WD and don't like the idea of spending $$$$ on front gears if I don't have to at this point. I was quoted $1,200 parts and labor for front, and $1,600 for rear. Oil and shop supplies additional.
Question 2: If I do need to do the front as well, is there a limit to the diameter of the gears I install? Maybe its just me, but the front diff looks smaller than the rear diff, and I'm wondering if can go as low as 4:30 or lower up front.
I was told I need to do front and rear even if I remove the front driveshaft because of numerous sensors etc... Any truth to this statement?
I would like to gear down to 4:30 or lower.
Question 1: Do I NEED to regear front as well if I intend to disconnect front driveshaft ? I have NEVER used 4WD and don't like the idea of spending $$$$ on front gears if I don't have to at this point. I was quoted $1,200 parts and labor for front, and $1,600 for rear. Oil and shop supplies additional.
Question 2: If I do need to do the front as well, is there a limit to the diameter of the gears I install? Maybe its just me, but the front diff looks smaller than the rear diff, and I'm wondering if can go as low as 4:30 or lower up front.
I was told I need to do front and rear even if I remove the front driveshaft because of numerous sensors etc... Any truth to this statement?
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
Well if you don't have a front driveshaft you can get away with what you intend, albeit not correct. A truck with 3.31 gears was a light duty F150 in 2017, hopefully this gear swap is to compensate for tire diameter and not to increase payload or towing. Which engine does this truck have? The 4.30 gears are not available in the Super 8.8 configuration if that's the rear axle you have.
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Tuned
Joined: Jan 2015
Posts: 472
Likes: 153
From: Southeast Wisconsin
Well if you don't have a front driveshaft you can get away with what you intend, albeit not correct. A truck with 3.31 gears was a light duty F150 in 2017, hopefully this gear swap is to compensate for tire diameters and not to increase payload or towing. Which engine does this truck have? The 4.30 gears are not available in the Super 8.8 configuration if that's the rear axle you have.
The sticker on the rear axle says S872A if that means anything to you. I could post a pic of the rear diff if that would help...
Also, the truck did come with a towing package, so I think the 3:31 gears were just there cuz thats what dealers order...
Moderator
Joined: May 2005
Posts: 8,237
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From: San Antonio, TX
Don't do anything halfway. Do it right or don't do it at all. What size tires are you looking to get?
Link to a recent thread
https://www.ford-trucks.com/forums/1...l#post19910310
Link to a recent thread
https://www.ford-trucks.com/forums/1...l#post19910310
Logistics Pro
Joined: Jan 2010
Posts: 4,153
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Don't do anything halfway. Do it right or don't do it at all. What size tires are you looking to get?
Link to a recent thread
https://www.ford-trucks.com/forums/1...l#post19910310
Link to a recent thread
https://www.ford-trucks.com/forums/1...l#post19910310
BUT.
If you ever do end up needing 4WD, without a front driveshaft you can't, and with mismatched gears you had better be in some VERY loose stuff and hope you don't come across a solid surface or you'll break something.
If you decide to sell the truck, you will either need to do gears in the front and reinstall the driveshaft, OR put the old gears back in the rear and reinstall the driveshaft. Very, very few people would be willing to buy a half-completed truck.
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Tuned
Joined: Jan 2015
Posts: 472
Likes: 153
From: Southeast Wisconsin
I get the whole "do it right or not at all" mentality. That is my standard M.O. But I'm not at all worried about resale or having 4WD at this point. And certainly not worried about it enough to warrant spending $1,200 for nothing.
If I find myself in a position that requires 4wd, it will be on the farm along the treeline where 2' - 3' snow drifts are common. If I get stuck, all I need to do is walk to the barn and fire up a tractor or other vehicle to drag it out.
So far, I gather that I have a super 8.8 and 4:56 gears are my best option, and that it is possible to disconnect the front diff without fear of electronic repercussions. If so, thats what I want to do.
If I find myself in a position that requires 4wd, it will be on the farm along the treeline where 2' - 3' snow drifts are common. If I get stuck, all I need to do is walk to the barn and fire up a tractor or other vehicle to drag it out.
So far, I gather that I have a super 8.8 and 4:56 gears are my best option, and that it is possible to disconnect the front diff without fear of electronic repercussions. If so, thats what I want to do.
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Fleet Owner
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Tuned
Joined: Jan 2015
Posts: 472
Likes: 153
From: Southeast Wisconsin
Thats a great idea. The plan was to pull it off anyway, so doing that first will settle my mind before doing the gears.
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