1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Tach innac?

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Apr 5, 2005 | 03:56 PM

#1

Hiflyer746

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Tach innac?

Hello all, 89' F-150 302 5spd 4x4. . . with a 3.08 rearend, checked by counting driveshaft revolutions. But the tach says at 55mph in 5th gear, I'm turning 2050 rpm. That can't be right. its supposed to be around 1600rpms. Are these tachs not accurate? can a sensor be wrong? What do you all think? FYI, speedo is INOP.
Thanks
Timmy

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Apr 5, 2005 | 04:58 PM

#2

andym

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From: Bonita Springs FL

The tach is pretty accurate on mine. What size tires are you running? How do you know you're going 55?

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Apr 5, 2005 | 09:44 PM

#3

Hiflyer746

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tires and mph

I am running I believe stock tires. . . 29 inches. But the tire says 31*10.5. But it measures 29 tall. I know I'm running 55 because I have had multiple cars confirm it, andmy dads GPS. So I am sure of that. But something just isn't right. So. . . . I gotta figure it out.
Thanks,
Tim

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