just ordered my underdrive pulley
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Captain
Joined: May 2010
Posts: 633
Likes: 1
From: martin county/florida
Might have to give it a shot $hit it u get 8hp and 25-26tq just off of the u/d pulley you gatta be able to feel all three plus ur mileage might go up because you are using less power maybe maybe not IDK lol mmmmm might have to take a trip to the scrap yard and cash in a truck load to try all three 
ya ill have to see wut it does for me when it finally gets here.. my friend told me to dyno before and after and ill gain more that wut the website says.. it happened to him on his stang.. problem is ive never dynod my truck with any of the mods ive done. and its 75 for 3 pulls where i live so the money i dont have to dyno lol!!
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Captain
Joined: May 2010
Posts: 633
Likes: 1
From: martin county/florida
ya.. i think next is e/fans and then im gonna buy a transgo shift kit! 110 off summit not including shipping for my 47re tranny
Veteran
Joined: Jan 2010
Posts: 485
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From: hickville WI
ya ill have to see wut it does for me when it finally gets here.. my friend told me to dyno before and after and ill gain more that wut the website says.. it happened to him on his stang.. problem is ive never dynod my truck with any of the mods ive done. and its 75 for 3 pulls where i live so the money i dont have to dyno lol!!
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Joined: Apr 2010
Posts: 87,399
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From: Clayton MI
Some of them are two, or even three, pulley sets. Keep the alt, and water pump turning at stock speeds.