What noise is this?

[OLR-067]

Seems the noise is still there, not sure where or what it is.It is a low pulsating rumble one every second at around 100km/h. Does not happen at low speed.There is no impact on performance, motor sounds ok and smooth. Had it looked at by a local Landy specialist and the only thing is a little noise in 2 and 3. They put EP90 in the box, so will be changing back to oil this weekend.The uni's are in good condition, and I don't think the handbrake is sticky.Could it be an induction noise.This one has me stumped.Any ideas.

Cheers
Paul

[Blknight.aus]

tyre harmonics is my opener.

Did this on a gunbugggy with the extra grippers on last month

Swapped all 4 wheels over for the steel trecks from an FFR and the fault could not be replicated. bolted the grippers back on and there it was.. proof of concept was bolting the tyres onto a second gunbuggy and the fault appeared on the second vehicle. (but oddly not on the FFR that we borrowed the trecks from)

[OLR-067]

Gday Dave,
I run steel tracks on the 110.Still it may be that, might pay to rotate.