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35's with 3.21 eco diesel

Dr.Shred

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Hello fam, I have a 22 ecodiesel 1500 with factory tires/wheels (22's) and 3.21 gears. im wanting to put on 35's. Im not concerned with rubbing (have revel links coming in mail) but I am concerned with wear and tear to the transmission and possible major hit to mpg's. Ive seen quite a few people comment online on the 3.21's inability to hold 8th gear and constant shifting back and fourth at 70-75mph on freeway and would be pissed if that was the case. I had a 21 1500 with Hemi w 3.92 that did well with the 35's (Nitto RG) and was able to hold 8th gear on freeway, still with a little drop in mpg which I was ok with. Im loving the mpg's im getting now between 27-30mpg w the ecodeisel and dont want to ruin the ride with watching the truck working overtime at higher speeds. I do a ton of driving in LA/OC as daily driver (20-25k mi per year). Thanks!
 

theblet

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Not sure about ED, but I would think it’ll turn the 35s fine. If you’re worried about mpg don’t put 35s on.

Hopefully someone who’s done this can chime in
 

BowDown

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EcoDiesel makes more low speed torque than the 5.7, 35"s and 3.21 shouldn't be an issue however mpg will drop but like @theblet said, if you're concerned about mpg drop, don't do it
 

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