F450 vs Ram 3500 DRW tow vehicle
So the wife and I are moving to the full time RV lifestyle. We just purchased a 42' toy hauler this weekend, with a GVWR of 20K#. Now I'm looking at a tow vehicles. I'm considering either purchasing a...
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That kind of goes back to what I said before that there is not reason to go with an F450 with a 18k load. Although, looking at the truck builder on Ford's site, it appears that 4.30 is the only option on a F450 so a 3.55 is a moot here. You have to step down to an F350 for a 3.55 gear and the only other option is a 4.10 for a diesel.
With the 3.55, 31.5 tires and .632:1 10th gear, that would put it at 1,675 at 70 mph with 2.24 torque multiplier from gearing. With your 320 hp number at 1,600 from before, the engines max torque output is 1,050 lb-ft and 2,352 lb-ft sent to the wheels with gear multiplication. With the 4.10, that would put you at 1,935 rpm with 2.59 torque multiplication from gearing. With your 380 hp number at 2,000 rpm from before, the engines max torque output is 998 lb-ft and 2,585 lb-ft sent to the wheels with gear multiplication. While the engine makes less torque at 2,000 rpm, the gear multiplication puts less of a load on the engine.
I would choose the 4.10 towing an 18k trailer 40% of the time or more, but that is just me.
With the 3.55, 31.5 tires and .632:1 10th gear, that would put it at 1,675 at 70 mph with 2.24 torque multiplier from gearing. With your 320 hp number at 1,600 from before, the engines max torque output is 1,050 lb-ft and 2,352 lb-ft sent to the wheels with gear multiplication. With the 4.10, that would put you at 1,935 rpm with 2.59 torque multiplication from gearing. With your 380 hp number at 2,000 rpm from before, the engines max torque output is 998 lb-ft and 2,585 lb-ft sent to the wheels with gear multiplication. While the engine makes less torque at 2,000 rpm, the gear multiplication puts less of a load on the engine.
I would choose the 4.10 towing an 18k trailer 40% of the time or more, but that is just me.
