RPM changes over time

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Mar 16, 2007 | 10:44 AM

MWomack

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Joined: Apr 2002

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From: Hockley, Texas

RPM changes over time

My neighbor has a 1 ton, HO, 6 speed, 24 valve. When new at 70 mph 2000 rpm’s now 2200 to 2300 rpm’s at 70 mph.

Anyone have any ideas what might cause this?

Thanks

Mar 16, 2007 | 11:14 AM

RowJ

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Joined: Apr 2004

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From: Texas/Oklahoma Border

Only thing that comes to mind is changing to smaller sized tires... or adding a 4.10 rear end??
Both are probably unlikely... huh?
RJ

Mar 16, 2007 | 11:49 AM

high country

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From: spokane/N. ID

tires and gears are the only things that can change rpm. a computer flash, or bum speed or engine sensor could make it appear to be revving more.

unless it is an auto truck