Speedo reads fast, I assume that my,,

mortar · 01-10-2009, 12:03 PM

odometer is not accurate as well?

So I'm almost afraid to ask if my speedometer is fast am I traveling more ore less miles according to the odometer?

mudseeker · 01-10-2009, 12:05 PM

you have bigger tires or something? what yr. is the truck?

leolkfrm · 01-10-2009, 12:08 PM

get on an expressway that has mile markers, set the cruise at 60, time it with a stop watch and you learn what the diff is

mortar · 01-10-2009, 12:10 PM

78 3/4 ton.

The tires are 245/75/16 so I think that's normal for this truck.

The truck has basiclly a completely new or rebuilt drive train. Not sure if that could have had an affect on the speedometer.

mortar · 01-10-2009, 12:11 PM

It has cruise but it doesn't work.

I've just checked it against 2 different vehicles driving on a highway together.

We communicated via our cell phones

leolkfrm · 01-10-2009, 12:15 PM

then try a steady foot on a flat stretch, do you happen to have any friends in law enforcement it's even easier

mortar · 01-10-2009, 12:17 PM

That's what we did we got on the highway and stayed side by side for miles.

The two other trucks read identical against each other my truck read 5mph faster.

mudseeker · 01-10-2009, 12:18 PM

Quote:

Originally Posted by mortar

78 3/4 ton.

The tires are 245/75/16 so I think that's normal for this truck.

The truck has basiclly a completely new or rebuilt drive train. Not sure if that could have had an affect on the speedometer.

could have different gears than what it came with then. once you find out how much it is off then you can get a speedo calibrater to fix it.

mortar · 01-10-2009, 12:21 PM

I bet that's it the truck is setup for some serious hauling power.

bradrhale · 01-10-2009, 12:24 PM

a speedo calibrator for a 78 model?? i thought that was cable driven off the tranny, or rather the tailpiece.

01-10-2009, 12:03 PM	#1
mortar Senior Member Join Date: Oct 2008 Location: Tulsa Posts: 64	Speedo reads fast, I assume that my,, odometer is not accurate as well? So I'm almost afraid to ask if my speedometer is fast am I traveling more ore less miles according to the odometer?

01-10-2009, 12:05 PM	#2
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,374	you have bigger tires or something? what yr. is the truck? __________________ i'd rather be hunting

01-10-2009, 12:08 PM	#3
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	get on an expressway that has mile markers, set the cruise at 60, time it with a stop watch and you learn what the diff is __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

01-10-2009, 12:15 PM	#6
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	then try a steady foot on a flat stretch, do you happen to have any friends in law enforcement it's even easier __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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01-10-2009, 12:10 PM	#4
mortar Senior Member Join Date: Oct 2008 Location: Tulsa Posts: 64	78 3/4 ton. The tires are 245/75/16 so I think that's normal for this truck. The truck has basiclly a completely new or rebuilt drive train. Not sure if that could have had an affect on the speedometer.

01-10-2009, 12:11 PM	#5
mortar Senior Member Join Date: Oct 2008 Location: Tulsa Posts: 64	It has cruise but it doesn't work. I've just checked it against 2 different vehicles driving on a highway together. We communicated via our cell phones

01-10-2009, 12:17 PM	#7
mortar Senior Member Join Date: Oct 2008 Location: Tulsa Posts: 64	That's what we did we got on the highway and stayed side by side for miles. The two other trucks read identical against each other my truck read 5mph faster.

01-10-2009, 12:21 PM	#9
mortar Senior Member Join Date: Oct 2008 Location: Tulsa Posts: 64	I bet that's it the truck is setup for some serious hauling power.

01-10-2009, 12:24 PM	#10
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,025	a speedo calibrator for a 78 model?? i thought that was cable driven off the tranny, or rather the tailpiece.

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