Put the truck in 4-hi, leave the emergency brake off, and put the front and rear of the truck on jackstands. Get underneath the truck and try to see if the front driveshaft rotates while you manually rotate the rear driveshaft. If it doesn't rotate, then the only uneducated guesses I can think of is that the shift linkage is somehow off a bit or there's something wrong with the shift fork inside the t-case (assuming Tacoma chain-driven t-cases have shift forks?). My bet is that the shift linkage is off - either you think you've moved the shifter sufficiently enough to be in 4-hi when in fact it's not, or it actually is in the 4-hi position but the linkage that connects the shifter to the t-case is off somehow. But who knows, those are just my uneducated guesses. Could be something completely different. Since it's new, I agree with the other advice that you might be best served taking it to the dealer and getting it checked out while it's still under warranty.04robbie said:
I'm inclined to guess that your t-case is working if the front driveshaft spins when you put it in 4hi/lo and rotate the rear driveshaft. But just out of curiosity, does it (front driveshaft) still spin even when you take it out of 4wd and put in 2wd? If not, then maybe your auto hubs aren't working correctly? Although I'm a bit stumped on that uneducated guess (front auto hubs not working) since you say that the front driver side wheel spins when you turn on the locker. (I take it you have an ARB up front?)04robbie said:
Sounds like a front differential issue......04robbie said:
liftedtacoma · updated 
SBS · updated 
