The high idle top speed would be part of the Cummins, Engine Control Module, programing, and re-setting it lower would have to be done at a Cummins facility. ( If possible at all )
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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