On the 3.0 pulley combo, I don't understand how you can get power by decressing the crank pully -20% but change the Alternator Pulley +20%. Wouldn't that just put you back at stock settings?

 

your still taking 20% out of th ac and power steering pumps

not a bad mod for 200 bucks for the complete kit

 

essentially, before going up or down in diameter for any of the pulleys, these are extremely light weight pulleys designed to make doing their job easier.

 

My crank pulley has been on a week and I have had no problem with dimming lights or anything for that matter.

 

i have both the water pump and the crank pulley on and my truck is runnin great lately only thing i have left is to get the alt pulley on but thats a work in progress

 

Well the alternator isn't direct weight on the crankshaft for one. But you also have to consider that the crank pulley is say 8 inches in diameter and if you reduce that by 20% it's only going to be 6 inches. The alternator pulley is only 2 inches or so and 20% added back onto that is only 2.4 inches. So you're still shedding significant weight in the process and spinning less.