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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Agree with Ivylog...I think you'll fine it's an Allison 3000, that's what all ISLs that I know about have. As for the power loss, check for a turbo leak around the hose/fittings. You'll have normal RPM, but a power loss.
