Is there anywhere where i can buy just a underdrive alternator pulley? i only see them with the crank pulley but i don't need it.

 

Try searching for "overdrive" alternator pullies instead of underdrive. Summit carries the ASP ones and I'm sure I've seen them at at least one of the sponsors' sites.

The overdrive pullies are used to speed up the alternator back up to normal speeds if you notice a voltage drop after underdrive crank pulley installation. I've also used an alt overdrive pulley for car stereo competition where they limit RPM to 1500 during SPL portion.

 

https://www.aspracing.com/ezRetail/s...php?msg_id=335

I got one a few months ago, they said to use a 1/2" shorter belt but didn't give me a part number for that so I put the stock belt back on and its just fine...

 

order placed-thanks guys