Adding under-drive pulleys to your truck is a great way to increase low-end power. The way that pulleys work is by gearing down the front of the motor. You can compare it to taking off in a 5-speed truck. It is easier to take off in 1st gear then second gear. By changing the sizes of the crank pulley and the alternator pulley your motor will have to work less to turn the front rack. Our install went very well. Our kit only came with the crank pulley and not the alternator pulley. First you will need to remove the upper fan shroud. If you have an alternator pulley, with a impact wrench remove the stock alternator pulley. The nut holding the pulley will be easier to remove if the belt is still on the truck. Once the nut is removed the belt can be pulled off to remove the pulley. We then installed the new pulley. We then remove the crank pulley. This is held on by 1 bolt and the pulley is pressed on. A crank pulley puller will be needed to remove the stock pulley. With the crank pulley removed we notice how large the stock pulley was compared to the under-drive pulley that we was going to install. We installed the new pulley and routed the new belt. The kit does not come with a belt so you will have to buy a new one. The kit will tell you what size belt to buy. On the test drive a noticeable power increase could be felt on the lower end and also throttle response became greater. We were impressed. One of the cons about under-driving your pulleys are the voltage drops at idle. When the rpms come down the volts will drop. Parked in the shop at night we could make our lights get brighter by just revving the motor. One way that you can make his kit more stereo user friendly is to not install the alternator pulley. If you do this you will have to by a one size smaller belt due to the fact that the stock alt pulley is smaller then the aftermarket pulley. Not installing the alternator pulley will change the power gain. You can also buy a smaller alternator pulley that will increase the voltage at idle. On my truck I do not have a voltage problem. It does drop at idle but not enough to cause a problem. If you have a stereo system I would recommend the smaller alternator pulley.