1999 N14 525hp rpm calculation check

I do not do tons of off road, but
3.36 with 11r22.5 and a 13 speed gives me 339 rpm at 1 mph for low gear. And i know that does pretty good and lets me shift up a decently steep hill maxed out on weight.

With his setup, looks like as long as hes using low low, same tires, that gives him 336 rpm at 1 mph. If short 22.5s.

While for heavy and steep starting speeds the bigger rpm number is better, 3 rpm difference doesnt seem that bad especially since his low range gears are closer together.

I could be wrong, as i said, dont do much off road

 

What hes getting at is in those conditions, your big hp and faster rear ends will be more likely to spin the tires instead of get you traction and moving.
While i dont think its terrible (see my previous post), its also not really the spec you see for most logging and off-road.

4.11s, 3.73s etc are way more common in those vocations. Theres probably a reason for it, so be aware that 2.85s even if they work fine, they may need a significant adjustment to driving style

 

I agree, but it's not so much what RPM you are at in the lowest gear, it's more if the u-joints/driveline/rear ends are still in one piece by the time the clutch is all the way out. A person can probably get away with it for quite a while if they keep their foot off the throttle and have a gentle touch, but one wrong move and it could get expensive.

The point was, try to get a truck that is purpose built for the work it will be doing.

 

I'm not saying you won't be able to, but if whatever work you end up with has you off road frequently the 2.85s are not a good choice.