Underdrive pulley...

[iwaslowr]

Has anyone done this mod?

 

[emann_01]

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]

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=X3oDMTBybnZlZnRlBHNlYwNzcgRwb3MDMQRjb2xvA2FjMgR2dGlkAw--/SIG=11u5jon0r/EXP=1245044649/**http%3a//www.lmperformance.com/15955/27.html

http://us.lrd.yahoo.com/_ylt=A0geur8pjjRKnlQAwLhXNyoA;_ylu=X3oDMTByamlqaW9mBHNlYwNzcgRwb3MDMwRjb2xvA2FjMgR2dGlkAw--/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]

I have an overdrive pulley on my Tahoe.

 

[iwaslowr]

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]

I have the one we sell

 

[J-Will]

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]

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]

did anyone see any difference in anything with this pully ???

 

[Conor]

$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.