Thanks for the feedback guys. Still torn on this as there's so much conflicting opinions on this. I don't want to settle and get the 3.21's and always wonder 'what if'. Like I said, I rarely tow. But with the heavier tires, I still want as much power as possible. Just wasn't sure on how much power will be lost from the heavier tires and a level. I haven't driven one with either yet. My current 4th gen has the 3.55's with the 6 speed and when I put the 10 ply's on it, I noticed the difference. But I've read where the 8 speeds make it not as noticeable. So I'm just trying to research as much as possible on it at this point.
I got the 392s in my truck and every day I’m so happy that I did, and that I didn’t allow myself to buy one that had the 321s. Granted, I don’t tow that much either myself and when I do, it’s a little 10-foot utility trailer but as someone else already said, that 392 rear end is just so much fun. lol. And even though I said I don’t tow that much and even when I do it’s a small trailer but see, it’s kinda like my 4-wheel drive- I may not hardly use it at all but I like knowing it’s there and that I got it in case I need it. I’d rather my trailer-towing capacity not be reduced because of the higher gear ratio and the constant shifting from the drivetrain trying to compensate for it.
If I try to keep my foot out of it, I can still get fairly decent fuel mileage in my opinion that’s even better than I’ve had in any other full-size truck I’ve had prior. I realize I could get probably upwards into the 20s or even passed the 20s if I had the 321s but as far as to me, I don’t drive my truck that much to really take advantage of that much fuel savings or to even really feel that much of a crunch from the decreased mileage that I get right now.
I can tell you I probably never will but if someday after I get the truck paid off and I get a wild hair up my ass and wanna raise my truck up to put 35s under it, I like knowing that my lower gear ratio will help compensate for that even though there’s been other members say that their higher gears and taller tires really don’t affect anything. That’s all fine and dandy but what works for them, may not necessarily work for somebody else.
But maybe you’d be fine with 321’s, maybe you won’t. But at least like it’s already been said, if you go for a truck that has the higher gears, it won’t be cheap unless you have the facilities, tools and know how to do it yourself, you can always yank the old ones out and put in lower ones.
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