I am using Globex performance. they came highly recommended by other jeep guys in area. they are booking about 2 to 3 months out.

 

Murphy Law broken. Amazon pulled through and (although intimidating) the module and app got the job done. No more limp mode, shifts smoothly and RPM's at 70mph match up with chart for 4.10 gearing. Thanks to everyone who replied here.

oops .... wrong thread, but for what it's worth, the Veepeak module and JScan worked great for setting 3.21 axle ratio to 4.10

 

Have you charted where you were rpm wise, then where u r now...then drive it for awhile on the 33's and see what ya feel in the seat of ur pants, then decide.....not the same but i regeared my Tacoma, Auto trans with 3.37's on 33"s up to 4.56 based on getting it back to where it was, made a huge difference...My rubicon is on 35's , 6 spd man with stock 4.10's and is fine, except for long big hills....

 

Forgive me if I missed it - but what is your transmission - manual or auto ?

My previous Jeep and my current JK both originally came with 3.21 gears - never could understand why the factory installed those dogs ...

Go with the gear change - you won’t look back - especially if you have a stick !

Neville