On the fence on which gears to go with

[Bldrinker]

I have a 1500 with 37s and I went up to 4.88s and fawken love my truck now .... acceleration is always there when I need it and going up hill is just fun ... before I wouldn't get out of 3rd, 4th gear and now it stays in 8th gear no matter the grade unless of course I chose to drop speed myself ...

Unless you have 35s I wouldn't go more than the 4.11s on a 2500 .... the rpms would be very high with that small of a tire wouldn't they?

You couldn’t be more wrong.
Funny thing is you comment how much more you like your truck after you changed gears.

6.4 6speed. Stock tires. Need 4:56
6.4 6speed 34” tires. 4:56 or 4:88 depends on how much unloaded freeway driving you do.
6.4 6speed 35” tires 4:88
6.4 6speed 37”. (You bought the wrong truck to tow heavy often) go 5:13

But hey I don’t know from personal experience or anything.

Truck came with 4:10 I now have 4:88
Tires are 34” trailer empty is 10k depending on the trip I’m 12k-13k

 

[GsRAM]

Personally, if your going to do it, do it right. Even on stock tires go for the 4.88s. That is what I'll do if/when I regear and I will be running stock tires. The rpm difference between the two is negligible.

As I mentioned in another thread, folks who have regeared almost never report they regret going with a taller gear... many state they wish they would have gone even steeper (numerically higher) grear than what they did.

The one post about the 4.88s and if too steep go to a taller tire was good advice.

With my 3.73s at 75 in 6th i believe I'm at or under 2k rpm and the engine almost seems to be lugging...(empty) she's begging for more gear.

Going from 3.73 to 4.10 is a total waste in my opinion. Not enough difference for all that cost.

At 13k trailer weight, your asking a lot of the 6.4 already, your already in Cummins territory in my opinion. Go 4.88s, you'll be glad you did.