Underdrive Pulleys

[rw0640]

I'm looking for underdrive pulleys for my 4.0. Any reason I shouldn't get them? Where can I get them?

 

[moddedsixxer]

I have the same question in all honestly but I would like to add are there reasons TO get them?

 

[JB_SN95]

you could get the underdrive crank pulley from here(link) but i dont see how its worth that much money

 

[rw0640]

Thank you for the link! I don't think the price is too bad if it really can free up 10rwhp on the 4.0

Underdrive frees up horsepower by rerouting the pulleys creating less power for accessories like ac, radio etc...
I still haven't found out if will I get any weird side effects from installing one, like will I be able to crank my radio or ac? will lights dim?

 

[JB_SN95]

im not 100% sure but since its only the crank pulley being changed you shouldnt have any problems, i think the alt pulley is the one to sometimes cause problems with charging

 

[rw0640]

Cool! I was just reading that about the crank pulleys. Also I found a lot of mixed reviews, most agreeing the power gained isn't worth the money... I've been hearing that a lot for all non power-adder bolt ons aside from exhaust and CAI