There are two sizes of alternators on the gen III engine. There is the 105 amp small case, and the 130 amp large case.. nearly every alternator larger than 130 is based off the large case design. The large case has the pulley in a different spot and uses a v-belt that is 3/4" longer than the small case belt. The smaller belt would still work..... BUT....now I don't know enough to say for certain if the tensioner can compensate completely or of you would be causing extra drag with the extra prrssure.. I have brought this up a few times and have not got an answer, but have seen other posters say that after putting on the correct belt, it fixed the problem.. I don't know if you might need to replace the tensioner now also, but I would make sure your belt is the correct part number, and replace if not.