03 silverado

iTrader: (1)

just wondering if anyone has the underdrive pulley on there trucks? are they any good? what kinda gains did u notice, i been thinkin bout gettin one but dnt no if its worth it, thanks in advance

06Sierra2

do a search, there was just a thread on this the other day and another like once a month. yes, i think they help for a few hp and a tenth at the track, but it wouldnt be one of my first mods. based on your sig id say go for it if you already have a stall, if not order a tc first. the best way is to put on a udp at the same time you swap the cam

BIGDADDY1969

Like they said in the thread ... If ur askin then u want one so get one lol i did n i find it helps out ... Not a huge gain but as they say the seat of the pants feel it made a difference... My 5.3 gets up lil faster it "seems" like .... As they all say get a tune after ur mods n it will get max out of it... I'm tuning mine in bout 2 weeks cause im def in need of one

03 silverado

iTrader: (1)

thanks guy, an ya i need a stall really bad but also need a new tranny

06Sierra2

I would spend my money here before messing with any other mods imo. call pb or flt and get a built trans/stall combo

SnakeOiler

iTrader: (6)

I didn't see any dyno gains when I installed my ASP, but I did see an 11hp increase after installing my FLT level4