Very true, some are indeed grounds from the main wiring harness, and not direct chassis to ground wires.
I posted them all in the attempt to be as thorough as possible though, just in case some of the wires (engine block ones for example) were broken. The OP would then know to look for them and spot any possible issues. Dont know where to look if its missing now do we?
The ones under the rig are indeed ground straps, that go from chassis to transmission and transfer case etc. Most are double looped, meaning there are at least 2 connections for bolts to go through along one strap. Tranny/transfer case and the head ones (ground straps) are like this.
I guess I should be more specific when trying to help folks out in listing the likes of ground points etc huh?
Although, I guess Alldata need a lesson too...
From the Alldata site for the WJ;
Disconnect two ground straps from the lower right hand side and one ground strap from the lower left hand side of the engine.
No need to get ultra picky IMHO. A ground location is a ground location, whether it comes directly from the chassis or a wiring harness that contains other wires within itself.
After doing my fare share of motor swaps, the need for good grounds is imperative to the correct operation of a rig and it's accessories. Just like securing your rig to a trailer, you can never have too many tie downs can you?