I didn't measure, but I got a new belt when I swapped in my 145amp alt, creederado posted up the GM pn and that's what I used

 

Well I got a 145A from autozone w/ lifetime warranty with a new longer gatorback belt. Thanks guys

 

ohhh....not a fan of AutoZone alternators, good thing it's located right on top and easy to swap out, you may be utilizing that lifetime warranty a little bit...or you may be one of the lucky ones...

 

Yep, hopefully it'll last. I agree, I'm not really a fan of AutoZone anything, but it was the cheapest thing I could find with a warranty more than a year.. I heard the 145A alts are supposed to be more reliable due to the better cooling, larger rectifier, and etc. Like you said, it's easy to swap out. Now that there's anti-seize on everything I doubt it would take more than 15 min to do the swap.

 

Billy... I haven't had a prob with mine, and it's been in for over 2 yrs.

 

That's good to hear Lisa...I suppose that they can be hit or miss...hoping the good folks here are more "hit"

 

ive had my 145amp alt with stock belt for about 4yrs now, alt was from pepboys.... about $130 at the time...