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1500 or 2500?
2018 2500 6.4L Tradesman
it won't hurt the transmission at all. the tie is 1" taller, the difference is a 1/2" extra side wall. all tires are different , some mud terrains in a 275/60r20 measure 33.75". a new vs worn out tire can differ over 1". your transmission is designed for a small tollerance.a 33" tire will fit with no issues. Going to a 34" might rub on turning, plus could lead to long-term issues with tranny heating up, unless you manually keep it in 7th gear. Also, rear end gear comes into play. Safer with 3.92, iffy with 3.55.