I drive an 03 Jeep Wrangler TJ 5 spd with 31" by 12.5" tires and stock gearing, and I go over a mountain twice every day to get to work and back home.
A sign on the road (mountain) tells me that it has a 8% grade. I asume that that is the steepest it gets.
I travel up one side in 3rd gear at 55mph at about 3000rpm for probably a little over 5 minutes, and then coming back the same thing but for almost 10 minutes.
Is this bad?
I do it because 4th cant take it and it slows going up.
I put it in 5th at the top all the way down.
3000 is fine. If you need to use a lot of gas at low rpm, like trying to use 4th or 5th up the hill, the engine will try to produce a lot of torque at a low RPM. This puts a lot of pressure on your rod bearings while your oil pump is turning slowly and producing minimal pressure.
It is better to use a gear with a (reasonably) higher RPM where there will be less strain on the bearings and more oil pressure to keep things lubricated.
Nah you are ok you are doing the right thing that is what it takes to do the job have a good one hope this helps.
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