Dear all, would anyone know the reason for the cabin drone that sets in at about 75 mph? The drone gets much less at about 90 mph and then almost disappears. When I take my foot off the gas pedal within that speed range, the drone seems to be gone.

My Ex V10 2004 4x4 has the following mods:

(1) SUSPENSION LIFT. ProComp 4".
(2) GEARS. Re-geared to 4.56.
(3) PERFORMANCE. Banks PowerPack, i.e. Banks cold air intake, Banks exhaust manifolds, Banks y-pipe, and Banks Automind programmer.
(4) EXHAUST. Flowmaster Super 44 muffler, single-in-dual-out (SIDO). Stock cat remained in place.
(5) WHEELS. Moto Metal MO951 Chrome wheels, 20x10, 8/170, ET -18, BSM 4.79, with 35/12.5/20 (315/60/20) Nitto Trail Grappler tires.

Any good advice is much welcome!!!

 

Can you make a recording and post the recording for our amusement analysis?

 

My first guess/suggestion would be to check the gear lube levels in the differentials.

BarnieTrk

 

yep, will do asap.

 

Mods were done 2 years ago, since then no leakages etc.

I guess the issue is the Banks Y-pipe that replaced the stock T-pipe. As you all know this T-pipe is said to be quite flow-restrictive. But that must have a reason. Maybe it has that restrictive shape to avoid the drone? Hence, the solution would be to get rid of the Banks Y-pipe and put the stock T-pipe back? I hope there is another solution...