2014 Tacoma lube at service???

^ This. There are 2 u-joints on the front driveshaft. Unless they have been changed (and likely even if they were changed), each u-joint will have a zerk.

 

We looked all along the driveshaft and only saw 3. There was one forward, one forward, middle and one in the rear.

 

OK, that makes sense for the rear driveshaft. Specifically, what about the front driveshaft?

 

I’m not driveshaft familiar enough to be certain, but aren’t they connected? How far forward is it?

 

Think about it this way: the rear driveshaft drives the rear wheels, and the front driveshaft drives the front wheels. It should be pretty visible between the front axle and transfer case (attached to the transmission).

Does your truck happen to have a full set of skid plates? That would cover the front driveshaft back to the transfer case, and would explain some of the confusion.

 

Maybe this video will help you.

https://www.youtube.com/watch?v=SWvO_rmKvro