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View Full Version : Underdrive pulley...

iwaslowr
06-14-2009, 01:28 AM
Has anyone done this mod?
emann_01
06-14-2009, 01:35 AM
Does someone make one?

If so, who and how about a link? Price?

I have done this to previous vehicles I have owned and it helped with power and MPGs.
iwaslowr
06-14-2009, 01:49 AM
Here are a few links...
http://marylandspeed.com/slp-harmonic-balancer-underdrive-pulley-19992008-gm-full-size-truck-suv-48-53-and-60l-v8-slp100230-p-1383.html

http://us.lrd.yahoo.com/_ylt=A0geur8pjjRKnlQAvLhXNyoA;_ylu=X3oDMTBybnZlZnR lBHNlYwNzcgRwb3MDMQRjb2xvA2FjMgR2dGlkAw--/SIG=11u5jon0r/EXP=1245044649/**http%3a//www.lmperformance.com/15955/27.html

http://us.lrd.yahoo.com/_ylt=A0geur8pjjRKnlQAwLhXNyoA;_ylu=X3oDMTByamlqaW9 mBHNlYwNzcgRwb3MDMwRjb2xvA2FjMgR2dGlkAw--/SIG=11p465pbc/EXP=1245044649/**http%3a//www.rpmoutlet.com/gmsuvasp.htm

http://www.neweraperformanceparts.com/default.asp?S=503&A=E&PKV=pbud25tr|0
JennaBear
06-14-2009, 08:51 AM
I have an overdrive pulley on my Tahoe.
iwaslowr
06-14-2009, 10:47 AM
I have an overdrive pulley on my Tahoe.

Which did you go with? I meet with Justin Friday and am planning purchasing one and having it installed before then.
JennaBear
06-14-2009, 11:24 AM
I have the one we sell :Big Laugh:
J-Will
06-14-2009, 12:41 PM
I have an overdrive pulley on my Tahoe.

whats the diff between an underdrive pulley and an overdrive pulley like you have? sorry im clueless
JennaBear
06-14-2009, 07:31 PM
The underdrive pulley is for the crank and the overdrive pulley is for the alternator.

I have e-fans, so to compensate for the needed amps, I put the overdrive pulley on, helps with the idle amperage for folks with larger stereos or e-fans. I have since gone to a 250amp alternator, but still have the pulley on there.

The underdrive pulley is on the crank and essentially slows down the belt, which can get you a few extra ponies, nothing drastic though.
Denali---LQ
06-15-2009, 08:28 AM
did anyone see any difference in anything with this pully ???
Conor
06-15-2009, 01:43 PM
$200 is a lot to pay for 4 HP on the wheels. Pretty sure you would never notice it. Money is better spent on letting them breath easier and juicing them up with a BlackBear.
iwaslowr
06-15-2009, 03:19 PM
did anyone see any difference in anything with this pully ???

I have noticed a difference on previous vehicles. Ordered mine today... and will let you all know once it is installed.

...Money is better spent on letting them breath easier and juicing them up with a BlackBear.

Both FTW!