Reviewed by Don C (WEST PALM BEACH, FL) Reviewed for a 2014 Chevy Silverado — Jan 23, 2018 12:01 PM

Great product, wish I got it earlier for my 35's

Reviewed by Shane P (MOORE, OK) Reviewed for a 2015 Chevy Silverado — Jun 10, 2016 4:39 PM

Worked as advertised. My calculations say my tires are 34". With truck weight they measure about 33.5. That is the number I used and it put GPS spot on. Truck seems to be shifting back into 4 cal mode more regularly now helping to boast mpg. Worth the investment.

Reviewed by Terry L (Killen, AL) Reviewed for a 2010 Chevy Silverado — Feb 12, 2016 8:34 PM

Put 3.73 gears in 2010 Siverado. Dealer could not calibrate speedometer. Did myself with Hypertech Speedometer Calibrator. Well pleased.

Reviewed by michael b (Longview, TX) Reviewed for a 2015 GMC Sierra — Oct 17, 2015 6:31 PM

Went through two different units and still can't get it to work

Reviewed by Eddie J (Harriman, TN) Reviewed for a 2007 GMC Sierra — Aug 06, 2015 1:01 PM

product arrived in short time had to get update but tech support helped right away no problems. checked speed against GPS and distance markers shows to be right on. good product

Reviewed by William W (COLUMBUS, OH) Reviewed for a 2014 Chevy Silverado — Jun 27, 2015 12:06 PM

I initially set the unit for 34" tires, the diameter of my Toyo ATIIs in 295 60r20, the speedometer was actually a couple mph over. After some downward-tweaking for tire inflation level, I setting the unit to correct for 32.75 inch tires got my speedometer accurate to within less than 0.5mph error compared to Garmin GPS. Keep in mind that actual tire diameter is dependent on how many psi you are running, so getting things right on the money may take some tweaking.

Reviewed by Jimmy E (LONGVIEW, TX) Reviewed for a 2009 GMC Sierra — Mar 16, 2015 8:33 AM

Started off with the Hypertech inline speedo calculator,it recalculated speedo,but ABS had problem with incorrect speed,call tech with problem,they said I needed the Reprogrammer732501,after uploading program for my truck,it wont communicate,called Hypertech,it isn't compatible with 4.3 V-6,something I stated when I called you guys about because it wasn't listed as an option in the catalogue,but your salesman said that it would work,and that you needed to update the listing,but it wont work

Reviewed by Taylor M (MESA, AZ) Reviewed for a 2014 GMC Sierra — Jan 26, 2015 9:06 PM

2014 GMC Sierra 1500. Fairly easy installation. Manual days you need to remove several fuses, but this is not necessary. Just make sure headlights are off, radio is off, and nothing is plugged into DC outlets. Did what it said!

Reviewed by Don L (PALM BEACH GARDENS, FL) Reviewed for a 2014 Chevy Silverado — Oct 22, 2013 5:56 AM

Works just as described, great product. Speedometer exact compared to GPS now.

Reviewed by Dean M (CLEO SPRINGS, OK) Reviewed for a 2008 Chevy Silverado — Sep 13, 2013 10:06 PM

Bought an 08 Chevy 2500 with 18" wheels. No help from dealer on speedometer correction. Found Hypertech on internet and was somewhat hesitant about ordering it. Got it anyway, programmed it to my vehicle, measured wheel as told to do and plugged the programmer in. In about 2 minutes DONE. Speedometer is now "RIGHT ON". Great product.