Cummins ISL 9 with Alison 4000 6 speed.
2014 Providence 42p pulling a toad. Combined total weight about 42000. Traveling on 70 through Utah. This rig really seams doggy. With cruse set on 65 it will pull down to 40 on evan the moderate gra...
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You simply need to learn to drive within ithe engines power band and forget trying to keep up with the cars. The ISL climbs very well at 2000-2200 RB so learn to use your gear selector and throttle to keep the RPM there. The engine wil run cooler and you will get up the hill.
