Re-gearing, what all is needed?

I agree when it's a 2nd Gen. Remember though that the 3rd Gen has a second overdrive gear of 0.58.

With stock tires and the stock 4.30 gears, you're turning around 2100 rpm at 75 mph. Change to 5.29 and the revs jump to just over 2500.

Go to 33" tires with 5.29 gears and your revs are 2340 at the same 75mph - a 200 rpm difference that will help turn those taller tires.

 

just put super small tires on it lol

 

I hope I read correctly that my 2015 2.7L and manual transmission has a stock gear of 4.10?

I’d love to get a re-Gear eventually for 33s but seems 4.88 vs 4.56 ?s come up a lot.

I live in the WNC mountains and even with stock 245 Dunlop’s it had to be floored to hold highway speeds uphill. I almost always have to downshift to 4th on my 4ply 265s.

I’ve considered trying a set of KO2s in 265/70 just to see how extra weight/stock gearing comes into play. BUT I don’t wanna spend more when 265/75s are cheaper.

Maybe I’ll get crazy and get some 235 KO2s!

 

I still think lower is better for the 2.7L. It'll happily buzz along at 3200-3300rpm all day. I plan on trying 4.88s and 33s maybe next year.

I'm located in southwest PA and we have lots of hills around here, nothing like the Rockies but it's enough to make the highway a slog sometimes. Speaking of Rockies I once took a trip up the I-70W pass over the summit and it was brutal! Pedal to the floor in second gear in the slow lane! Shift up to 3rd and begin loosing speed. It was rough, but I don't do that very often.

I have a theory regarding lower gears and higher rpms. If you are using say 80% throttle and 2600 rpm up a hill with 4.10s I bet you'd be using more gas than maybe 60% throttle and 3200 rpm with 4.88s. These numbers aren't scienced out but it's just an idea I have. Gas usage is mainly determined by air flow, which is determined by throttle position. Of course more rpm means more air flow too but I think throttle position has more of an effect than rpm. On my Ultragauge I've noticed a few percents of throttle position increase sends the MPGs down in a hurry.