Speedometer Calibration

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Feb 23, 2018 | 10:14 AM

MkeMike

Thread Starter

New User

Joined: Jan 2018

Posts: 9

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Speedometer Calibration

2018 CCSB SRW 6.7 Lariat
Getting my 4" BDS RA Lift installed and upgrading to 37's

What do you guys use to re-calibrate your speedometers?

Feb 23, 2018 | 10:16 AM

stewy604

Elder User

Joined: Aug 2017

Posts: 703

Likes: 1

I have that same setup on mine, I left the speedo alone. With Forscan, you can get close to 35's I believe. For me, I'm ok with the truck logging "less miles" and reading slower than actual.

Feb 23, 2018 | 10:29 AM

Tricon

Logistics Pro

Joined: Apr 2017

Posts: 3,674

Likes: 51

From: SoCal

You can use FORscan to change your tire size, 35's work fine, 37's will throw a CEL. Only other option is a Hypertech Speedo calibrator. You have to remove the dash (IPC) and install it. Once its installed you're good to go.

Feb 23, 2018 | 10:43 AM

MDK123

Mountain Pass

Joined: Jan 2018

Posts: 111

Likes: 5

Left mine alone and estimate MPH. I just add about 10% to current speed.

Feb 23, 2018 | 01:13 PM

POLSKI76

Freshman User

Joined: Feb 2018

Posts: 36

Likes: 0

From: Thompson OH

I did the same lift too, Went the DSC coil over and the ride quality is amazing compared to stock. Like mentioned above I have decided to just leave it, 10% will keep you safe.