It's pretty easy - if you have an impact. Leave the belt tensioner on and break the pulley nut lose. Take an 18MM socket and take tension off belt. Put new pully on reverse process.
If you've got a stock 65amp alt on your stang - watch your battery charging - when you've got a lot of accessories turned on. The stock alt is a bit underpowered for these cars with accessories - when you change the rpm of alt - you're going to get less total amps.
We went with a PA-Performance 130amp 3G upgrade as we've got a BlackMagic flex-a-lite fan, and my 16-year old wants to put a stereo in the car.
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