Driveline humming

is this normal

 

Are you stock...Tires and suspension?

 

It is normal for a Tacoma, according to the dealer

 

I have 2 1/2 spacer on the front and 1” blocks in the back

 

It might needle bearing front diff . Put in 4wd, if it goes away it is needle bearing.

 

"Driveline humming" is kinda vague.....

When/under what conditions do you hear or feel it?

 

With the truck on level ground and in park grab the rear tire at 10 and 2 with some force try and rock the vehicle back and forth if the center section of the rear end where the drive shaft is attached moved up and down more than an inch shit can the blocks and go AAL. With 2.5 up front and no diff drop you will be replacing the needle bearing upfront it just a matter of time could be the cause as well.

 

Thank you