04 Tacoma 4x4 TRD, 145k, A/C won't blow from center vents, blows to floor only. Previous owner says it's been an intermittent problem, do I nd to be looking for a vacuum switch? Also, this truck has seen very heavy off road use in the oilfield, while replacing the front struts yesterday, I found a ton of front driveshaft slop at the spline area. Could front hubs be stuck in 4x? Any solution other than a new driveshaft? While it was definitely used in 4x, hard a few times, it wasn't locked in daily or even monthly? Guidance please!