On our 04 Allure with ISL 370, the Low Jake would kick in, and switching to High was also not making a difference. As part of our purchase agreement, this was repaired by Cummins for us, with the cost covered by the seller.
In our case, Cummins had to go under the valve cover, and reset a mechanical setting. If I understood it right, the setting was not correct out of the factory, so the full compression of the second set of 3 pistons was not kicking in. The valves were not full closing.
Reading up on this, I recall also a group of 03-04 (I think) Country Coaches that had a pin problem, between the Allison and ISL.
I'd suggest a Cummins shop that is also a certified Allison repair too, and let them run diagnostics.
Our repair, made a 'seat of the pants' difference.
Best of luck, and sure would enjoy you closing the loop and letting us know what you find out.
Smitty
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07 Country Coach Magna Rembrandt 45' ISX600
Roo II was our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
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