That's pretty weird. I have a Cat motor with a true Jacobs 2 stage. I don't know if your Detroit uses a true Jacobs or some competitor. I'm pretty sure I've left the Jake brake switch on when shifting in/out of neutral. Never heard of something like that happening. Can't wait to hear how it worked when you took it for a drive and didn't turn on the engine brake until you were rolling in gear. That will be the true test.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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