The most notable change for the 2018 Ram HDs will be the revised Cummins B6.7 (no longer ISB6.7) that meets the 2017 emissions specs for CO2. The rest of the truck will be pretty much the same, with some new trim packages. No word yet on power output.When does Ram usually announce such things?
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The fully redesigned Ram 1500 will be introduced at the Detroit auto show in January as a 2019 model and will begin production at Sterling Heights shortly after. The existing 2018 1500 will continue production at Warren until Sterling Heights is fully up to speed and dealers all have a full supply of the new truck. FCA is willing and able to keep the current 1500 in production as late as December 2018 (the last month a 2018-model can be manufactured), although they could also produce later than that as a "Ram Classic" for fleet use.
There is still no definite timetable for the redesigned Ram HD, although the reveal sometime in calendar 2019 is likely, with production as a 2020 model. Also no concrete word on whether the HDs will move fully or partially to Warren (which can build more trucks than Saltillo, just as Sterling Heights can build more than Warren). If Warren does get the nod for some or all of US models, the new trucks will start there, then Saltillo will retool once Warren is rolling. In that scenario, Saltillo would continue to produce Rams for Canada, Mexico, and central America along with any needed US overflow production.