Have you checked your front hubs. Pull them apart a d give them a good clean up and service.

Are they vacuum activated or mechanical?

If they are vaccum check for any leaks.

Easiest optio is to fit freewheeling hubs ? I think that will solve your issues. Factory hubs have been know n to be problematic.

3 options for free wheelin hubs

AVM
Warn
Mazda B2000 with a couple of small mods

Cheers, Chris

97 Sporty, snorkel, K&N filter,chipped, ext forks, 40mm Dob Springs, KYB struts, 35mm Jeep TJ Springs, RAV 4 OME shocks, Kaiser Locker 5.38 R&P's, 1&3/8 body lift, 245/75 R16 D674's Sports steering wheel, bullbar, extractors & 2 1/4 exhaust engineered.