Does anyone know if you'll experience antilock brake problems by going to a 34" tire?

 

i dont have any problems with ABS and 35's-
just a thought & could be totally off:
i suppose that on a tuner-free vehicle, the pcm would still think/program the abs sensors to the original diameter tire- so if you had 34's, and activated the ABS it could be slightly funky due to the increased weight of the tire, and the sensitivity being off due to the tire diameter. --but nothing too drastic i don't think.
the tuner allows the pcm tire diamter to be changed which should calibrate the vehicle speed sensor and the abs sensors

 

There are a ton of members here and at FTW with tires much larger than 34 inches on F-150's, F-250's, F-350's, Expy's, etc, and I've never seen a post about any problems with ABS. Not saying you could not have a problem, but you would be among the first.