WoW , im impressed. this worked perfectly. 98 s10 4.3 X code. i got lucky and got the alternator on ebay for $57 + $15 shipping and the 4060970 belt. flawless install. not only that, but my neighbor pointed out something to me i never knew or noticed. the tension pully actually has a mark on top that shows you the area the tension pulley should be in. it was dead center. it tested 150 amps at hot idle. THANKS FOR THIS POST !!!!!!!