I have a kind of non problem, in that it may be nothing, or normal.

When sitting in D at lights (yes i know there is a whole thread on whether that should be done or not) i get a resonance from either the tc or box every 15 seconds or so. Nothing particularly noticable but there non the less. Is this a "feature"? Im not sure if its a new "feature" or whether it has been there since day dot.

Im assuming it may be some sort of bypass valve in the tc kicking in to reduce the pressure (no idea if that is right or not!)
Any ideas????  There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6

I usually sit in 'D' at lights, and have never noticed any resonance, don't know if we have a different box though (ZF 6 speed on ours).  2006 (56 Reg) 4.4 V8 Vogue In Bonatti Grey (Gorgeous!!)

Same box.

Its just a slight light shimmy every 15 seconds like clockwork....... Hey ho, probably the start of something expensive! There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6