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Question . Was the speedo correct before the tire change and trans service?
If this was a Dodge P/U , I'd say programming issue ; Workhorse chassis , I'll have you wait for members with more experience on W/H.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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