Tire Size/Gear ratio/Tranny questions

[handloader90]

With a 6.0 a cam with around 210ish degrees of intake duration on 114ish LSA with about .550 lift will get you where you want to be.

Thank you! I'll call TSP or BTR and see what they've got!

My recommendation is to just keep the 4.10's for now and see how it does. If you don't like them you can change them later. The 4.10's will probably be better for the daily driving aspect and should be perfectly fine for off-roading. I have a 2500HD with a stock 6.0L and 33" tires and to be honest I think the engine is running pretty high RPM's when cruising down the highway empty....at least a higher RPM than what is needed. For towing you can always run in 4th gear instead of OD......again, with the 4.10's and 33-35" tires you could spin the engine at whatever RPM it is at on the freeway forever.

A couple comments I always make:
- there is not much difference between 4.10 and 4.56 gears....if you have all or most of the parts already and can do the work yourself it's not that big of a deal, but no way I would shell out the $ to buy all new parts and then pay a shop for the labor to do this
- in this situation the lower gears are only for the road driving and towing aspect. Since you will already have a good crawl ratio with the 1st gear of the NV4500 and low range of the 241 a couple steps lower in the axle ratio is not going to make a big difference off-road, rather they are to get the engine rpm in the right range when cruising the freeway
- gear the vehicle for what it spends the majority of time doing......if you mainly DD an empty truck on the freeway I'm not sure you want 5.13 gears on 33-35" tires. While I agree it would be nice for acceleration and such they are probably not the best for fuel economy, noise, etc... on the freeway.

Thanks for taking the time to write that. I'll stick with the 4.10's/ 35's for the time being and se how she does. It will see way more DD time than towing for sure.

 

[Richcz28]

How often will you tow?

I think 4.88 is too much gear for cruising around on the highways. I think with as much motor as you’ve got, you’ll be able to do just fine with 4.10s.

What’s the difference between 4th gear towing with 4.10s and 5th gear towing with 4.88s?

You’ve got plenty of gear at 4.10 for any trail you’d run on 35s with the nv4500 first gear.