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If you have If you have an LS with a flush crankshaft flange you will need the 0.4" crankshaft spacer or the torque converter nose will not be located in the crankshaft pilot, no you do not need a bell housing adapter for that application.

Should, look around though as there are ALLOT of LS/Gen I conversion mounts, I would suspect the HUMMER ones would be priced as such, look at the pictures real close then go look at others, many times in the HMMWV world folks just re-label stuff to make money.

Looks like it will not be too hard, only a spacer/bolts and correct flex plate should get you going, the applicable sentence below. " To accommodate an older transmission where the crankshaft flange is extended, Chevrolet created a 0.400-inch steel spacer to be used with the most common LS...

No the bell housing and LS engine are not compatible, you will have to do some kind of adaption, I am doing the reverse right now, installing a 6L transmission on a 6.2L and it required a bell housing spacer plate and spacers for the TC, a gen 1 would bolt right up but not an LS. You will...

Yes the LS has been swapped in along with some gen I, small and big blocks, also the Cummins 4 and 6BT and of course the Duramax, the last two require extensive modifications and mucho expense. Having the 4L80 is no different as far as options than the TH-400