I'm sorry if this is in the wrong section...

I am looking at purchasing an underdrive pulley and have found that some come with the overdriven alternator pulley and some don't. So my question is do i need the overdriven alt. pulley or will i be fine without it? Thanks in advance.

Jed

 

It is best to run the alternator pulley to maintain the correct charging system voltage. Check out these pulleys.

http://www.summitracing.com/parts/ASP-549984/?rtype=10

 

I run the Powerbond udp on my '07 Tahoe with no overdrive alt. pulley. I have had zero problems with the charging system at all.

 

X2 Same here

 

i had no issues until i installed e-fans. the initial startup of the fans would make the voltage dip bad. the overdrive alt. pulley almost fixed it. it just barely dips now

i have the asp pulleys, btw