The difference is the mechanical engines versus the electronic controlled engines. With the electronic controlled engines, the Jake can be programmed either way but apparently all the DDEC II engines that Newell used were programmed with the cruise overriding the Jake. With DDEC III and above, at least some, if not most, were programmed to have the Jake work with the cruise control engaged.
With the mechanical engines, the cruise and the Jake didn't have a clue what the other system was doing so the Jake is still operational even with the cruise control actually engaged.
Pros and cons either way. Good to have the Jake help slow you down on a short downgrade with the cruise control on but they can fight each other under some conditions.
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