I never want to see 2000RPM in a Cummins unless it's over 35K gross weight.
I geared my 2010 with 3.42's and a 68RFE...87mph @ 2000RPM. I would think a VE would be happy at 1700ish @ 70mph.
Chris
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THANKS TO:
Tim Barber @ TRE Diesel
Jeff Mumau @ Mumau Diesel Service
Rip @ Source Automotive
Don Thuren @ ThurenFab Suspension
Columbus Diesel Supply
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