A-trac noise/whine??

i have never aired down the tires, i just hit 4h on the fly and im on top of the sand. no problems at all.

as far as the noise goes... it is only heard in 4lo with the A-trac on. no other times is it present. Im also not sure what to believe now, because some moderators earlier in the thread said that the noise was normal. I dont know anyone else around here that has a newer model TRD OR to compare it to.

 

WestonJ, in this video you can hear the noise that A-TRAC makes on my truck. Listen carefully at time index 12. It's the sound of the hydraulic pressure increasing at the driver side disk brake.

http://www.youtube.com/watch?v=cF1WDuLJd4Q&feature=player_embedded

 

sorry to kinda thread jack OP!

but i just got used 07 TRD OR4x4 saturday. and i don't see any A-trac button? i have the RR dif lock button and i now it works! do 07's not have it?

 

i believe its only on the 2009's and newer. it would be right next to the cigarette lighter

 

oh ok that must be it. i have nothing there just the 2 power plugs. i new i was missing/did not have something. (seen photos of the area on here) but i thought maybe because i have auto. o well and thanks for the info!!

 

Okay, well the only sounds the A-TRAC makes is a popping, banging, spring uncoiling set of sounds... as Crom's video has a bit of this noise in it. It sounds bad, but the A-TRAC works so good... and the manual says the noises are 'normal'.

However, I would not call it a whinning noise (unless that is your interpretation)... and the A-TRAC only makes the noises I described for brief moments as the tire is braked when it is in the air or slipping... and not constantly... since A-TRAC is on standby for traction loss and doesn't actually run constantly.