at what rpm should engine run at 55mph out of tow/haul mode

Asked by swade2500 Jan 02, 2014 at 04:35 PM about the 2003 Chevrolet Silverado 2500HD 4 Dr STD Crew Cab SB HD

Question type: General

I live in the U.S. it has the 4L80E trans and flat road driving.

1 Answer
51,255

John answered 10 years ago

It depends on the gear ratio of the rear end. Put the transmission in tow mode and see what the RPMs are at 55 mph. Take it out of tow mode and now see if the RPMs have dropped. If the RPMs have not dropped, that may be the problem. Since 55 mph is around the normal highway driving speed, I would guess the engine should be turning at or near the 1800 to 2200 RPM range. The 70s trucks would turn around 3000 to 3500 RPM range due to the rear end and transmission gearing.

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