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Old 03-02-2019, 01:26 PM   #1
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Best Gear Ratio?

I am shopping for an upgraded tow vehicle. Three gear ratios are offered. 3.21, 3.55, and 3.92. I would be towing a 27' Forest River Surveyor. Do I need the 3.92 or is 3.55 OK?

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Old 03-02-2019, 01:46 PM   #2
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Without knowing the engine and transmission I’m going to say 3.92.

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Old 03-02-2019, 01:50 PM   #3
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Assuming the engine can handle it, 3.55 might be OK on the flats while 3.92 (or higher) will be needed for western mountains. I have 4:10s in my 2500 Chevy.
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Old 03-02-2019, 01:52 PM   #4
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You going to be towing it every day? If not the ratio makes no difference.

3.73 axles on my '07 Ford 5.4V8 towed no better then the 3.31 axles on my '17 3.5EcoBoost. With a good engine torque curve the axle ratio matters little.

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Old 03-02-2019, 01:58 PM   #5
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Add to the confusion....GM and Ford are about to release new 10 speed transmissions to the heavier trucks. Do not know how many overdrive gears will be in them, so homework will have to be done what rear gear ratio will be best!
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Old 03-02-2019, 02:03 PM   #6
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As a general rule of thumb...

The only time you will regret having too short (numerically larger) of gears is at the fuel pump. You will regret too tall (numerically smaller) gears all the rest of the time.

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Old 03-02-2019, 02:17 PM   #7
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For a Dodge Ram 1500 you'll likely get a higher towing capacity with a 3.92 rear axle.
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Old 03-02-2019, 02:42 PM   #8
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4.10:1 or nuthin’

But I don’t really know.

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Old 03-02-2019, 03:14 PM   #9
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Check the towing capacities of the vehicle. Yours trailer could be #7,000.

Most new trucks have transmissions with more gears. Usually a lower first gear. Many automatic transmissions start the car in second as a result. My new Jaguar does.

Older trucks had a four speed with a non synchro granny low you used to pull for ultimate power and nothing else. Sort of the same deal.

The rear number a fixed gear ratio. The higher the poorer the mileage every day. A little faster. Runs at higher rpm on the highway.

If your pulling boats out of water go big. Otherwise I would go with the truck stats.
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Old 03-02-2019, 03:29 PM   #10
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Don't know the truck platform, engine, weight of the trailer, where he's towing, or anything else. So, I'm going with 8. My answer is 8.

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