I know when we started building H3's, we had both 4.10 and 4.56. Now I haven't checked in a while, so they could have canceled the 4.10. I'll check it out next week and see if what we are now building.
I looked through the plant parts list and it looks like the 4.56 is the only one for the Hummer, now. The 4.10 must have been dropped.
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