‘17 3.5 Eco, 6” lift on 37’s with stock 3.55 gears.

Gonna be regearing soon, most likely going up to 4.56 since I have 37’s. Been told 4.88 might be a better choice?

Any input?

Also, any input on brand? Yukon and Nitro come up a lot. Also been told Revolution?

TIA

 

I nearly went 4.56 with my 35’s so I’d definitely consider 4.88 with 37’s.

 

Seems like 4.56 would bring me back closest to stock, 4.88 would be a little better performance wise? I am running a 5* 93 tune.

That sound right?

What brand did u go with?

 

What are you using to calculate these numbers? A 4.10 gear would put you back to stock. 4.88's are pretty extreme!

Use this calculator... https://www.intercotire.com/tire_siz...tio_calculator

You will find that switching from the stock 32" tire to 37's and installing 4.10's puts it back to a 3.55. 4.88's would be like having a 4.22 ratio stock with 32's. That's more gear than I'd want, but to each their own.

Side note...find someone really good to do the install. I've had a few gears done and most don't seem to get shimmed properly.

 

I'd look at rpm's and make a decision as to where I want them to be at highway speed. Honestly, a 7% jump isn't much, less than 150rpm at 2000k.

Both are more gear than a 3.55 with oem tires, so you're in good territory for pushing 37's.

 

The problem with these gear ratio calculators people always drop in these threads is that they fail to account for the added weight and rotational mass. Thats half the equation and you will be disappointed if you don't factor it in. 37” tires which i assume are muds or at least hybrids, are heavy AF. Always at least jump up another ratio on top of what any calculator tells you.

Also, gears are only as good as the installer. Even the most perfectly cut ring and pinion is gonna howl like a MF’er if the installer doesn’t take the time or doesn’t have the experience to get it right.

 

Got my numbers crossed up, lol. Ur right 4.10 is what I calculated as well for closest to original stock. 4.56 is where I was leaning for a step up since I’m running performance parts and the 93 tune. But a few people I talked to threw out the 4.88’s so I wasn’t sure.

 

I’m running Nitto Ridge Grapplers, not the heaviest but heavy. Lol since I have them, the 93 tune and performance parts that’s why I was leaning 4.56, a step up from the 4.10 which calculated as closest to original stock. 4.88 was another some had mentioned so I wasn’t sure.

I agree on the install and installer, I’ll be shopping for the best locally once I decide on parts.

 

If you can, buy the parts from the installer. Often they won’t warranty their work if the parts aren't sold by them. Check with the installer on this before you buy anything.

 

4.56 would put you as the equivalent of a 3.94 with stock size. I could see that making sense. As Threeper said above, you do have more rotational mass.

Is your tune from a reputable tuner? A good custom tune will also make a HUGE difference. Canned tunes do very little. A good custom tune will add 100+ ft lbs of torque down low and make all the difference.

I'm only on 34's, but with the stock 3.55's I still don't have traction with just a second gear roll with the 5 Star tune. It makes so much torque down low that more gear would just be more tire spin.