Reduced tire size - Rubicon

[Nomaybes]

Looking for guidance - I reduced the lift and tire size on my (relatively) new to me rubicon. The speedometer was spot on prior to the change - but of course requires calibration now.

My question - since I have aftermarket tire size and gearing - should I look for some sort of calibration device before purchasing? If yes, where / how? I know it’s not a gear in the xfer case since this is a rubicon.

Thanks in advance!

 

[LONGJP2]

Smaller than stock?

If it was spot on with non-stock stuff, then there's probably some sort of recalibration unit already on it.
Like a SpeedoHealer.

https://www.jeepz.com/forum/product-reviews/41785-speedohealer-correcting-your-speedometer.html

 

[LONGJP2]

Mine plugs in on top of the transfer case (looking from the rear). If there's one there, you'll see two plugs instead of just one. The cable coming from those plugs is then long enough to mount the unit anywhere in the engine compartment or cab.

 

[pagrey]

What size tires and gears are you running now? That basic information will really help with the answers you get.