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  #1  
Old 12-30-2010
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Underdrive Pulley

just got my underdog, underrive pulley and new belt on. it was a pain in the *** to get off with out taking the fan shroud and fan off but we got it when i took off the old one and compared them, it seems way smaller than 20% haha.
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Old 12-30-2010
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nice work. how do you like it? notice much of a performance gain?
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  #3  
Old 12-30-2010
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thanks it should give me 1-2 more mpg and i just drove it and at the same rpms andi usually acelerate, it is way quicker. then i punched it and had some spin in the tires, which i ouldnt even do when i had my lil stock tires
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Old 12-30-2010
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newb.
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Old 12-30-2010
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Is it really that good?

How much did that one pulley cost?
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  #6  
Old 12-30-2010
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Do they offer this for the 4.0 too?
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Old 12-30-2010
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Quote:
Originally Posted by calebw15 View Post
Do they offer this for the 4.0 too?
Yeah.

Here are the 4.0 specific ones they have.
4.0L Pulleys : Underdog-Performance, The Art of Power
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Old 12-30-2010
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Originally Posted by zak873 View Post
newb.
haha

but it does make a hell of a diff , more than i thought
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Old 12-30-2010
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is worth getting the full kit?? i dont have a stereo system and i dont live in super hot weather so water pump and alternator pulleys rlly dont matter that much.. might just get the underdrive pulley only
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Old 12-30-2010
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Originally Posted by immortal_vision View Post
is worth getting the full kit?? i dont have a stereo system and i dont live in super hot weather so water pump and alternator pulleys rlly dont matter that much.. might just get the underdrive pulley only
just the crank pulley is all you need
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  #11  
Old 12-30-2010
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newb.
no one calls mr cool aid a newb! you sleep with one eye open cus i be busting threw all your walls and kknock you house down...then i will take all liquids and make you die of dehidration
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  #12  
Old 12-30-2010
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Originally Posted by Lord Of War View Post
Is it really that good?

How much did that one pulley cost?
this pulley is $80, pays it self off in no time with the mpg increase
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Old 12-30-2010
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Originally Posted by 01DangerRanger View Post
no one calls mr cool aid a newb! you sleep with one eye open cus i be busting threw all your walls and kknock you house down...then i will take all liquids and make you die of dehidration
you're gonna be busting through a helluva lot of walls! lol. gonna cut me open and drain me of my red cool aid?
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  #14  
Old 12-30-2010
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you're gonna be busting through a helluva lot of walls! lol. gonna cut me open and drain me of my red cool aid?
im mr. cool aid man, im used to those things, its my job...other than being red and tasty. and no way, you get grape drink cus you aint good enuff for my inerds
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  #15  
Old 12-30-2010
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Old 12-31-2010
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^ he did it, oh yeaaah.
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Old 12-31-2010
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I'm thinking about getting this thing for the 4.0. A good investment in the future if I can get better MPGs. Hell even 1 MPG better would be good for me, lol.
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Old 12-31-2010
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Originally Posted by Jelly's Ford View Post
I'm thinking about getting this thing for the 4.0...
Just so you know...I ordered a crank & alternator pulley for my 4.0 from Wayne @ Underdog-Performance on October 7th, and it's still on backorder. Last I talked with Wayne, he said the manufacturer (ASP Racing) said they should start shipping them about the 1st of the year...but I don't know how many are backordered.

Last edited by logan03CO; 12-31-2010 at 11:17 AM.
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Old 12-31-2010
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Wow, thats one long back order.
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Old 12-31-2010
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^Alright thanks for the heads up. It will be a while till I get enough money to buy it anyways, dang Christmas lol.
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  #21  
Old 12-31-2010
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the 4l underdrive pulley is like 200 or something, i forget why but there is some special piece on it because of it being a 4L
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  #22  
Old 12-31-2010
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Originally Posted by 01DangerRanger View Post
...there is some special piece on it because of it being a 4L
Yep, on the 4.0's the crank pulley basically has a "built-in" harmonic balancer.
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  #23  
Old 01-01-2011
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^ yeah what he said. Just gotta make sure you get the right tool to take off the stock pulley and you are good to go. I am pretty sure you can rent one at like advance auto parts or autozone.
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  #24  
Old 01-07-2011
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You change just crank is it hard to find the right belt? That alone changes length right? Just wondering. I'd like to start working on some gas mileage stuff this year.
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Old 01-07-2011
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Originally Posted by DJKing View Post
You change just crank is it hard to find the right belt? That alone changes length right? Just wondering. I'd like to start working on some gas mileage stuff this year.
His website has a "belt guide" indicating the shorter lengths you need depending on the pully combinations you install.

GatorBack belt Size Guide [reference only] - $0.00 : Underdog-Performance, The Art of Power
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