Wrong diff gear ratio.
Senior User
Joined: Jan 2013
Posts: 153
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Yes. This.
The vin code would be different and so would the door sticker, etc., if the truck was built as you ordered it from the factory.
Postmaster
Joined: Aug 2015
Posts: 3,146
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From: Maryville, TN
Originally Posted by SnowPlowDriver
I am surprised no one suggested you refuse delivery of the truck. I woudn't be happy with dealer replacing ring and pinions on a new truck.
As far as the vin, I don't think it indicates what gears it had, I may be wrong. But I think the I'd tag on the door jamb and the tags on the differentials is all that tells. Someone that knows 100% can correct me if I'm wrong.
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New User
Joined: Jun 2017
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Campout
My conclusion as long as you use original tires the only required change is to flash the computer for gear ratio to correct speedo. GVW does not change. Tow rating increases considerently. it appears the door jam stickers do not require changing. Dealer will perform gear change soon will see how it works out. Had first road trip on 373s best vehicle I have ever driven.
My conclusion as long as you use original tires the only required change is to flash the computer for gear ratio to correct speedo. GVW does not change. Tow rating increases considerently. it appears the door jam stickers do not require changing. Dealer will perform gear change soon will see how it works out. Had first road trip on 373s best vehicle I have ever driven.
Postmaster
Joined: Aug 2015
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From: Maryville, TN
Originally Posted by Campout
My conclusion... it appears the door jam stickers do not require changing.
I don't know what package you ordered on your truck, but take it as an opinion from someone that's running 4.88's and 37's, and who's dad has a 4.30 truck with little factory 245/75r17(31.5"), if you ordered a truck with 20" wheels, or have plans on running an oversized tire, skip the 4.30's and go for a 4.56. Especially since your going to be towing heavy. If you ordered a small tire truck, then you should be very happy with the 4.30's. Good luck, and no matter what you do, you will enjoy the lower gear ratio more.
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New User
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Wrong gears
Camp out
2017 f350 275/70/r 18 11500gvw srw 6.2 will have 430 gears will start with 9 ft camper and atv trailer possibly 34 ft toy hauler latter. Plan on staying with factory size tires. Use rhino for off road.
2017 f350 275/70/r 18 11500gvw srw 6.2 will have 430 gears will start with 9 ft camper and atv trailer possibly 34 ft toy hauler latter. Plan on staying with factory size tires. Use rhino for off road.
Cargo Master
Joined: Jan 2015
Posts: 2,824
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From: Boise
That's a great tire size for the 4.30. My next tires I will be dropping down a bit to the 295/70/18 Michelin which I also feel are a great match.
Postmaster
Joined: Aug 2015
Posts: 3,146
Likes: 32
From: Maryville, TN
I agree, that's a 33" tire and will work well with the 4.30. I also didn't consider that the ford dealer is doing the work and you probably couldn't get them to install Yukon gears anyway. Enjoy your truck, you will definitely notice the difference in gearing. The truck will want to pull away from red lights effortlessly and will not want to down shift on the small grades.
Tuned
Joined: Oct 2006
Posts: 453
Likes: 12
Campout
My conclusion as long as you use original tires the only required change is to flash the computer for gear ratio to correct speedo. GVW does not change. Tow rating increases considerently. it appears the door jam stickers do not require changing. Dealer will perform gear change soon will see how it works out. Had first road trip on 373s best vehicle I have ever driven.
My conclusion as long as you use original tires the only required change is to flash the computer for gear ratio to correct speedo. GVW does not change. Tow rating increases considerently. it appears the door jam stickers do not require changing. Dealer will perform gear change soon will see how it works out. Had first road trip on 373s best vehicle I have ever driven.
The door sticker does state the rear gear ratio. If the truck gets a second owner, how are they to know the correct gears? What if he needs to repair/replace either the front or rear gears? That could be disastrous thinking they are 373s.
Postmaster
Joined: Aug 2015
Posts: 3,146
Likes: 32
From: Maryville, TN
Originally Posted by spud57
Speedo does not need to be corrected for gear change. Only tire change.
The door sticker does state the rear gear ratio. If the truck gets a second owner, how are they to know the correct gears? What if he needs to repair/replace either the front or rear gears? That could be disastrous thinking they are 373s.
The door sticker does state the rear gear ratio. If the truck gets a second owner, how are they to know the correct gears? What if he needs to repair/replace either the front or rear gears? That could be disastrous thinking they are 373s.
Logistics Pro
Joined: Apr 2000
Posts: 4,334
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From: Mills River
ref: Bulletin Q-262
HTH,
Jim / crewzer
Tuned
Joined: Oct 2006
Posts: 453
Likes: 12
My take is that the truck must be reprogrammed if the gear ratio and/or tire size is changed.
ref: Bulletin Q-262
HTH,
Jim / crewzer
ref: Bulletin Q-262
HTH,
Jim / crewzer