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I got a 2020 f350 with 275/65r18’s want to switch to 275/70r20 with 3.55’s will I notice a big difference in take offs and low end towing 15000lb excavator/trailer?
 

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275/65R18 in inches:
Diameter: 32.1
Width: 10.8
Sidewall: 7
Circum.: 100.7
Revs/Mile: 629

275/70R20 in inches:
Diameter: 35.2
Width: 10.8
Sidewall: 7.6
Circum.: 110.4
Revs/Mile: 574

that three inch difference in diameter is gonna make it a dog.
you would be better off going with a 275/60R20, it is much closer to stock size:
Diameter: 33
Width: 10.8
Sidewall: 6.5
Circum.: 103.6
Revs/Mile: 612
 

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with the lower first gear in the 10 speed you'll never see a difference. My 2020 will tow 15-18K like it ain't even there
 
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