Question about 1999 Chevrolet Tahoe
Changed tires to 265/75/16 and speedwas off 15 mph, used tires one year, changed back to original 245/75/16, speed is of still by 15 mph.
Looks like you changed width of tire and not profile. Should/would not have made 15mph difference anyway. If you purchased vehicle new, I would suspect the road speed sensor needs to be tested. If you did not buy it new, previous owner probably had a set of large profile tires on it and changed the speedo gear/pickup assembly at the transmission.
Posted on Feb 21, 2012
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Posted on Jan 02, 2017
SOURCE: I recently purchase a 2005
Speedometers read the rotation of the drive train, usually in the transmission, and so changing tires will not change the transmission ability to read (count) the rotation.
But the transmission rotation will increase or decrease with different sized tires, since they go around faster or slower, depending on the size change.
A smaller tire will go around faster to go the same distance that a larger one goes. So in this case, the transmission will also be going around faster, and the speedometer will be giving a false reading.--------- Bigger tires will make the odometer to read 'long' and the speedometer to read fast. Smaller ones would make them read 'short' and slow.And this all also makes difference in fuel mileage and this makes fuel reading bit different.-------- ---------------- They do not do it automatically, but you can reprogram them with a scantool if you put bigger tires on it.You will get false reading,but to re-adjust the readings correctly,you will need to readjust the transmission settings by scan tool.Which can be done at dealer.As they will have exact specs to do this.But also this can be done at local auto parts and repair center, who has the re-programming scan tool.--------------- This should help.Thanks.Helpmech.
Posted on Feb 26, 2011
When you replaced the ABS sensor on the hub, did you clean and re-gap the sensor to the speed ring on the hub. There was a recall on the ABS Malfunction on your truck. The tire size don't make a difference to your ABS as long as all four tires are the size, There was a issue bulletin with your Tahoe on the ABS activating under 8 km/h. Good luck and hope this helps, if not clean out the sensor with brake parts cleaner and check the wire harness and ABS sensor bracket. Re gap the sensor to the speed ring hub. Here is the bulletin. Anti lock Brake (ABS) Activation at Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007C - (05/16/2006) 2001-2006 Chevrolet Suburban, Tahoe, Silverado
Posted on Jun 25, 2009
It is possible, but you will need to take it somewhere to have it done. They will need to put it on a dyno tester and also connect to computer to reset the speedo.
Posted on Nov 17, 2009
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