reluctor ring replace how difficult related to PO339 crank sensor replacement.

If AFTER inspecting signal plate, it is damaged, 'somehow' the front of the engine will have to be disassembled to access it... It's behind the timing cover.. I've been doing auto repair for a LOT of years (too many) and I have NEVER had a problem with GM signal plates and very rarely the crank sensors .. This is well beyond a DIY repair... Good luck with yours..