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2019 6.2 Axle Ratio question

  #1  
Old 07-10-2018, 11:21 AM
Stinson1
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2019 6.2 Axle Ratio question

Hello,

I am getting ready to place an order for a 2019 4x4 crew cab lariat 6.2 F350. The bed will be removed and a service body will be installed that will weigh approximately 2k lbs with work supplies.

I am ordering the 350 so I get the normal torque shift trans and not he G just so I have the heavier trans and rear axle for long term durability. This truck will not ever tow a trailer, just see the payload of 2K plus passengers.

The truck will see rural country roads and highway use, about 35K per year. This truck will be replacing a 2014 Ecoboost that had a service insert in the bed. The 3.5 has been great, and we have no power complaints, but we are maxed out on payload, so moving up to the superduty. Not interested in the added cost and complexity of the diesel since this truck will not be towing.

Should I consider the 4.30 axle to help the 6.2 get moving and feel a little more pep? Should I expect much of an MPG impact going to the steeper axle?

Thanks
 
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Old 07-10-2018, 11:27 AM
Fr8dog69
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The gasser srw 350 still gets the same Sterling rear end the 250 gasser has. Only the 6.7 SRW 350 automatically gets the M275 rear. The 250 with 6.7 comes with sterl8ng standard but the M275 is optional.

If your not towing, and don’t live at high elevation,, I would venture to say 3.73 gears would probably work well enough.
 
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Old 07-10-2018, 11:29 AM
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Full disclosure, I have a 6.7.

My neighbor has a truck nearly identical to mine with the 6.2 and 3.73 gear. After driving his I would probably want the 4.30 for everyday use unloaded.

I would think the 4.30 would be ideal for your application. Hauling 2K lbs daily I would want the extra gear.
 
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Old 07-10-2018, 11:29 AM
Stinson1
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Originally Posted by Fr8dog69 View Post
The gasser 350 still gets the same Sterling rear end the 250 gasser has. Only the 6.7 SRW 350 automatically gets the M275 rear. The 250 with 6.7 comes with sterl8ng standard but the M275 is optional.

If your not towing, and donít live at high elevation,, I would venture to say 3.73 gears would probably work well enough.
Thank you for the clarification on the axle!
 
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Old 07-10-2018, 11:41 AM
mwheue
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I have the 3.73 gears and tow a 10K trailer just fine. Not a issue with weight, but if you drive around town a lot I have heard the lower gears help fuel mileage a little. Also couldn't hurt on the highway as mine spends a lot of time in 5th gear when pulling.
 
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Old 07-10-2018, 11:51 AM
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Please, someone correct me if I am wrong but... If you get the 20's that usually come on the Lariat, even with the 4.30 gears, you'll really only have a 3.97 ratio. If you get the 3.73's, you really have a 3.44 ratio. The factory ratio is based on the smallest sire size in these trucks. I would do the 4.30's for sure.

When I had the stock tires on my F350 (275/65/18) my second tank of fuel I hand calculated and got 14.1 mpg with mixed use driving. Around town and keeping the Hwy speeds down will get you pretty darn good economy with the 4.30's.
 
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Old 07-10-2018, 12:31 PM
cattaco
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Axle ratio has nothing to do with tire size. Now changing the tire size will change your effective gear ratio. If you are ordering I would just get 4.30's. I don't think you will see much of an improvement in your mpg to justify 3.73's.
 
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Old 07-10-2018, 01:01 PM
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I know its not a '19 but my 2013 F350 is similar to what you're doing. 6.2L 4X4 SRW with an 8' Knapheide service body. Its loaded down with lawn maintenance supplies and from April until late August, my 200 gallon Lesco tank sprayer is in the bed.

I have 285-70-17 tires and a 3.73 rear end. i wouldn't change a thing. Pulling my equipment trailer which is around 5200 lbs., it does great. Running without the trailer is a very nice ride and the truck will absolutely fly when I get on the gas.

I honestly think the 4.30 is completely unnecessary for what you're wanting to do.
 
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Old 07-10-2018, 01:30 PM
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Question

Originally Posted by Stinson1 View Post
Hello...I am getting ready to place an order for a 2019 4x4 crew cab lariat 6.2 F350. The bed will be removed and a service body will be installed that will weigh approximately 2k lbs with work supplies...I am ordering the 350 so I get the normal torque shift trans and not he G just so I have the heavier trans and rear axle for long term durability. This truck will not ever tow a trailer, just see the payload of 2K plus passengers... this truck will not be towing...Should I consider the 4.30 axle to help the 6.2 get moving and feel a little more pep? Should I expect much of an MPG impact going to the steeper axle? Thanks
What size tires? the 3.73 axle is probably OK with the OEM 18" wheels and AT tires, but the 4.30 may be better with the optional factory 20" wheels and AT tires.

HTH,
Jim / crewzer
 
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Old 07-10-2018, 01:34 PM
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Originally Posted by cattaco View Post
Axle ratio has nothing to do with tire size. Now changing the tire size will change your effective gear ratio. If you are ordering I would just get 4.30's. I don't think you will see much of an improvement in your mpg to justify 3.73's.
My point is that your not really getting the final ratio that you think you are when people buy these trucks. Even if Ford recalculates it in the computer for mileage purposes, the final ratio is effectively reduced with the larger tires.
 
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Old 07-10-2018, 01:42 PM
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Originally Posted by HST View Post
My point is that your not really getting the final ratio that you think you are when people buy these trucks. Even if Ford recalculates it in the computer for mileage purposes, the final ratio is effectively reduced with the larger tires.
That's not really the way to think about it.

Road speed for a given rpm is determined by transmission gear ratio, differential gear ratio and tire OD.
 
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Old 07-10-2018, 03:21 PM
Section179
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Just about everybody with 3.73ís will say get those, and those with 4.3ís will say get those.

Whats your typical highway cruising speed, and how much time do you spend on the highway?

Unless you cruise at high speeds on the highway more than you do anything else, and are concerned with gas mileage at those speeds, I think you will be happier with 4.3ís. The truck I just ordered is with 4.3ís. See? Everybody says get what they did.
 
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Old 07-10-2018, 03:27 PM
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If you spend more time on the highway, get 3.73's.
If you spend more time on county roads, get the 4.30's

I chose 4.30's because I live in the mountains and rarely travel the highway more than a few miles at a time.
 
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Old 07-10-2018, 04:32 PM
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If you are taking the time to spec everything you want, with a special order - why skimp on gearing? I have the 4.30 and love the almost "granny gear" feel.
Most SD's around here on the lots have the 3.73 electronic locking, why pay bucks for a locking almost good enough ratio.. Do you want locking ?
Also - the 6R100 & 6R140 have different gearing, the 6R100 has lower gearing.
 
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Old 07-10-2018, 04:50 PM
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Lightbulb

Originally Posted by 7591250sd View Post
... Also - the 6R100 & 6R140 have different gearing, the 6R100 has lower gearing.
The 6R100's gear range is indeed broader than the 6R140's, but the middle four gears are close:

Gear / 6R100 / 6R140
1 / 4.17 / 3.97
2 / 2.34 / 2.31
3 / 1.52 / 1.51
4 / 1.14 / 1.14
5 / 0.87 / 0.85
6 / 0.69 / 0.67

HTH,
Jim / crewzer
 

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