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General rule of thumb for the diesels is @ peak torque RPM.
My fleet agrees with that, having happy gearing around that speed.
ALH TDI is about 2000
5.9 Cummins ISB is ~1650
Both of those are around 55 MPH in the top gears. I re-geared the truck higher to get there.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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