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Discussion Starter #1
Folks that are towing heavy loads are requiring optional 4:10 gears on the 2500/3500 6.4L trucks.

Would towing in 5th gear with 3:73 gears accomplish 5h3 same thing?

Does the torque converter lock up in any gear but 6th?

What exactly does “tow/haul” do in these new (2018) trucks?
 

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Discussion Starter #2
Every question you have about Dodge products could be answered here

Allpar.com

Great site! The 66FRE does lock up in all forward gears except first.

Tow haul simply holds gears longer and shifts quicker
 

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You can compensate for not having a lower diff ratio by running in a lower gear, but you can't do that in 1st for off the line power. The taller ratio has more top end, the lower one has more bottom
 
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