Rumble strip noise on light throttle to no throttle transition

[burtoncr]

Next and hopefully last small issue to diagnose and fix on our new GX.

At highway speeds when I transition from very light throttle to no throttle or the opposite I get a noise / slight vibration like hitting a rumble strip only much much quieter. It happens more going from on to off throttle.

Initially I thought it was tires so I swapped the wheels / tires with the known good stock set I had from our other GX, but the noise / vibration persisted. I haven't greased up the driveshafts, but that is next on my list since that seems to fix weird NVH things.

Any other ideas?

 

[phishtaco]

Search on t4r on "rumble strips". Most say time for tranny flush and fill.

 

[Burner01]

How many miles on your truck?
When I picked mine up with about 150,000 miles on it it was doing the same thing.
After hearing quote a bit of skepticism over a full system flush due to potentially creating bigger problems I went with the drain & fill option.
I picked up two jugs of Valvoline Maxlife ATF (WS compatible) and proceeded to drain and re-fill with the exact same quantity then drive it around to circulate the fluid then repeat until the two jugs were empty. On the last fill I added a tube of Lubeguard shudder fix.
15,000 miles since then and no more rumbling, shifts perfectly, nice and smooth.
Hope that helps.

 

[burtoncr]

Been meaning to do a ful flush on our other gx. Guess its time to do it on both. Im not worried about disturbing sediment like people warn you about. That happens when you use a machine to flush the system. I did a flush on our old 4runner at 190k and it was fine. Just took my time letting 1 qt pump out of the return line, turn off the car, add a quart to the pan, turn on the car, pump another quart, repeat.

 

[Burner01]

Sounds like you've got it under control!