Loud knocking under load in 4WD

[MightyMouse]

Take it to DBOR..... they usually will have a quick look at this sort of stuff and will give you an opinion.

Sometimes 10 minutes with someone who knows JK's is worth a day at a stealer.

[trbn8r]

Installing 4 springs, Shocks and drop brackets is not nuclear physics..... There is little chance a decent mechanic will stuff it up..... As MightyMouse said its their way of saying screw you....

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[BOBI]

the shocks are hitting on the chassis rail at the front it is common with that kit get a track bar and recentre the axle

[4wd man]

OK, just to close this off, I found the culprit. It was the recovery hitch knocking around in the receiver. I've wrapped it with silicone tape whilst still leaving a gap to easily pull it out if need be and went wheeling a couple of times since and it's been all good. In hindsight, that's the first thing I should have looked at.
Thanks very much everyone for your inputs!