1995 Chevrolet Silverado

Brakes problem
1995 Chevy Silverado V8 Two Wheel Drive Automatic 225000 miles

I have a 1995 silverado that has tire size 235/75R15 and have front antilock brakes. I have a set of tires 245/60R15 that I would like to put on my truck. My tire shop says that the new tires being a lower height and are a greater than a 3% difference(actually about 8% is what they say) will affect my antilock brakes as they operate based on tire revolutions. Can I get away with this or is it a bad idea as my tire shop tells me?
Thanks for any info?
July 6, 2010.

It is true, but check with your chevy dealer, they may be able to get this for you: VEHICLE SPEED SENSOR BUFFER Removal & Installation Ensure ignition is off. Disconnect negative battery cable. VSS buffer is located behind glove box. Remove 4 screws mounting VSS buffer to dashboard. Disconnect 2 small electrical connectors from VSS buffer. Remove VSS buffer. To install, reverse removal procedure. ADJUSTMENTS VEHICLE SPEED SENSOR BUFFER If axle ratio or tire size is changed, it is necessary to replace VSS buffer to ensure proper operation or 4WAL brakes, cruise control, speedometer and engine Electronic Control Module (ECM) or Powertrain Control Module (PCM). Failure to replace VSS buffer as required may affect driveability of vehicle and 4WAL brake operation. CAUTION: VSS buffer is sensitive to Electrostatic Discharge (ESD). DO NOT touch VSS buffer terminals with hands or tools, or VSS buffer may damage due to static electricity. NOTE: Information for VSS buffer part number applicable to axle ratio and tire size combinations is not available from manufacturer. On some vehicles, VSS buffer is actually a part of the Digital Ratio Adapter Controller (DRAC), although the 2 terms may be used interchangeably.

Jul 6, 2010.
Thank you, I will contact my dealer to find out more. I suspect that the VSS Buffer may have already been compromised as in 1996 I have my motor rebuilt and since then my speedo has been about 5 mph faster based upon police speed reading signs. You mention that driveability may be affected. Can you be more specific? Knowing what you know would you swap the tires and not swap out the VSS buffer? Thanks again for your reply.

Jul 6, 2010.
ABS light on, improper shifting, possibly rough engine performance. Innacurate speedo. Rebuilding the engine usually doesnt affect the VSS buffer.

Jul 7, 2010.