Personally think you should drive it more than 20 miles (at the time of your OP) before really assessing on how the gears are working out for you. Cant help with MPG since i dont calculate mine.

Great mod imo.

 

Yeah, aside from guys who had issues due to poor installs, I've never heard anyone say anything negative about re-gearing...

 

i'm trying to look at the spend of installing gears vs the performance gain?, as for installation the guy have a full shop for doing only 4x4 stuff and customize for jeeps off road, so is pretty good, i little expense butt i know my install is good, i have no noises, whine of any king.
like u said have to wait for break-in and see, as far for the tires the 315/70-17 will help right?.

 

Only thing you ever hear is regretting not doing it sooner or going higher. on a side note...

Hammer's quote of the day:
I only have three emotions - Horny, Hungry & Hatred. If I don't have an erection, then you best be making me a sandwich...

That is a good one!!

 

yea i know that is a good one!!!

 

As far as MPGs go, yeah since it should get your RPMs down considerably, but from a performance standpoint, the smaller the tire, the better the hole-shot.

If you're not seeing snap your neck back results now, something ain't right. Even on 35s it's hard to even tap the gas lightly without a perceptible snap forward when starting to go.

Out of curiosity, what RPMs are you seeing at speeds? I was down around 1600 at 70 MPH with the 35s with 3.92s and I'm up around 2100 with the 4.56s which is pretty much right in the powerband the Hemi seems to like.

With 31 1/2" tires your RPMs should be stupid high at any decent speed. Of course with a manual transmission it's apples to oranges, you may need to adjust your shifting to the numerically higher gearing...

 

i'm at 2500 at 30mph 3rd gear and 2000 at 40mph 4th gear, trying to keep it under 45mph, maybe because is a manual tranny and is not that noticeable now??, i don't know, have to wait and see, remember that yes the truck feels lighter but not hole lot, and as far it goes 2day was the first time i can use the 5th gear on the city without hole lot off gas!!.

what u mean shifting to the numerically higher gearing...???

 

Shift points are a constant with the 545rfe, but with a manual you are deciding when to upshift. I'm saying you may have to play around with where you are shifting.

Interestingly, I can't find a soul with a Hemi or 4.7 and manual tranny who re-geared among all the guys I know who re-geared. Can find a few CTD guys who went 4.56 with a manual tranny, but these guys all did it for running big honkin' meats. So I have no point of reference - you sir, may be the proverbial guinea pig.

But again, this is all pre-mature. You'll have a better idea after break-in when you can drive it like you stole it. Plus you already know you are at less than ideal gearing with your tire size. After getting the tires you intended to get when you decided to re-gear I'd suspect all will be right with the world...

 

OMG if you had an exhaust and you were turning those RPMs at that speed you would be soundin like a rice burner lol

 

what u guys think is better for me 35x12.5-17 or 37x12.5-17 for my stock setup,rim,nv4500 and 4.56?, what king of tires u guys recommend?