I know a couple of you guys have used the DJM 4/6 drop to lower your Lightnings, or some other brand for the rear 6.

My truck is about to go up on the rack for the rear 6, but before they start, the shop thinks that because the L comes dropped 2" in the rear from the factory, that I will get an 8" drop, not this 6.

Is this true? Do I need to buy stock F150 shackles or can I go had with the C-notch, flip kit, and the L's stock shackles and see a 6 drop?

Thanks.