So what is the best alternator for the 4.3L? I have viewed previous threads but havent seen a concise answer. I see a Ac Delco number 335-1080 and 321-2159. 321-2159 seems to be about $100 more than 335-1080? Why? I have also seen high out put part number from the full size pick up recommended? My voltage drops, according to my gauge, to under 10 after its warm.. so i need something .. I would like the best least expensive alternator for my Jimmy. Are remanufactured units a good deal? Help. Which alternator is recommended?