need help with gears and speedo recalibration

[MIKE-HKS]

what are you guys doing once you install gears and 35  tires to recalibrate the speedometer ?
my truck originally came with 3:23 gears , so i upgraded to 4:10  and 35 tires
speedo is way off  98mph on the dash  80mph on the phones GPS
dealer or programmer ? whats the best option ?  cheapest option
 

[m3n00b]

If you don't want a tune you can use something this which is what I originally used(check and make sure this fits your truck)

 

Hypertech 752501 Speedometer Calibrator https://www.amazon.com/dp/B006RQ44O4/ref=cm_sw_r_apan_glt_fabc_P47AM0A8PKWZVMX432MY

 

 

I've since switched to black bear tune and would highly recommend going that route.  Made my truck drive like a sports car.

Edited January 13, 2022 by m3n00b

[newdude]

1 hour ago, MIKE-HKS said:

what are you guys doing once you install gears and 35  tires to recalibrate the speedometer ?
my truck originally came with 3:23 gears , so i upgraded to 4:10  and 35 tires
speedo is way off  98mph on the dash  80mph on the phones GPS
dealer or programmer ? whats the best option ?  cheapest option
 

 

 

Dealer can only program for factory sizes.

 

Programmer, tuner, calibrator, etc. are your options.  

[JimCost2014]

speedo is way off  98mph on the dash  80mph on the phones GPS

 

Off topic, but does that mean your speedometer shows 18MPH when you are stopped

[MIKE-HKS]

44 minutes ago, JimCost2014 said:

speedo is way off  98mph on the dash  80mph on the phones GPS

 

Off topic, but does that mean your speedometer shows 18MPH when you are stopped

no , its off because the gear change , and bigger tires

[aseibel]

its proportional.

The sensor is displaying 1.225x the actual speed because the tires rotate 1.225x less than OEM.

 

From middle school math 0 x 1.225 is still 0.

[MIKE-HKS]

2 hours ago, m3n00b said:

If you don't want a tune you can use something this which is what I originally used(check and make sure this fits your truck)

 

Hypertech 752501 Speedometer Calibrator https://www.amazon.com/dp/B006RQ44O4/ref=cm_sw_r_apan_glt_fabc_P47AM0A8PKWZVMX432MY

 

 

I've since switched to black bear tune and would highly recommend going that route.  Made my truck drive like a sports car.

i use the truck to pull the boat and daily driver, so it only sees 87 octane fuel , to take full advantage of a tune you have to run 93 ,i just want to recalibrate the speedo the cheapest way possible  , we have a gov at 98mph in my case i cant pass 80mph on the highway , need to fix this ASAP
 

[swathdiver]

44 minutes ago, MIKE-HKS said:

i use the truck to pull the boat and daily driver, so it only sees 87 octane fuel , to take full advantage of a tune you have to run 93 ,i just want to recalibrate the speedo the cheapest way possible  , we have a gov at 98mph in my case i cant pass 80mph on the highway , need to fix this ASAP
 

 

Not so, you can tune for 87 or whatever and still see performance gains, especially in the transmission.  A BlackBear tune is not the least expensive way possible but is your best bang for the buck!

[CamGTP]

Buy the Hypertech thing, it will do what you need it to do.

[Supreme Pizza]

 

 

There is always someone there to let you know EXACTLY how fast you were going....

 

 

 

[JimCost2014]

Write me up for 98
Post my face, wanted dead or alive
Take my license, all that jive
I can't drive 98
Oh yeah

(I can't drive 98)
(I can't drive 98)
(I can't drive 98)
(I can't drive)
98
Uh

Yea had too. 

[lovecars]

On 1/13/2022 at 10:07 AM, m3n00b said:

If you don't want a tune you can use something this which is what I originally used(check and make sure this fits your truck)

 

Hypertech 752501 Speedometer Calibrator https://www.amazon.com/dp/B006RQ44O4/ref=cm_sw_r_apan_glt_fabc_P47AM0A8PKWZVMX432MY

 

 

I've since switched to black bear tune and would highly recommend going that route.  Made my truck drive like a sports car.

 

problem is if you live in the great state of Kalifornia you can't get one delivered here and the new cars will tell the computer at time of smog check that a tuner had been installed and removed.... talking about Big Brother

[lovecars]

16 hours ago, Supreme Pizza said:

 

 

There is always someone there to let you know EXACTLY how fast you were going....

 

 

 

 

I use Waze to tell me the posted speed and the curreent speed... but I'm going to order the Hypertech because has a Kalifornia approved sticker.. but i have to buy the one without a tuner...