2013 tacoma with a gear whine

Just bought my taco at 13k miles now has 17k. I recently did a small 3 inch spacer lift with 2.5 aals in the back. The kit came with spacers for the front diff drop, rock guard and center carrier bearing. Everything came out great during the install about 2k miles ago but I've recently noticed some gear whine. Almost like I'm driving on some very chunky mud tires. You can feel the vibes slightly through the pedal and wheel. It's sometimes intermittent at first but can be constant when coming to a stop.
I'm coming up on my first dealer oil change soon and have the full Toyota warranty from the certified preowned deal. I'm wondering if they will honor any parts and repairs needed or if they will deny me because of the spacer lift.

I've read a few threads about axle joints and front diffs going bad. I'm hoping it's something easy like the carrier bearing on the drive shaft that I can easily replace. I'm going to pull her into the garage and get her on some jack stands to see if I can trace the source of the noise.