5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Quick Underdrive Pulley Question

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Old Sep 10, 2007 | 03:42 PM
  #11  
p1bigun's Avatar
p1bigun
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Default RE: Quick Underdrive Pulley Question

I've been wondering my cars voltage is always low and the stock belt wouldn't fit reckon some one put underdrive pulleys on it
Old Sep 10, 2007 | 05:02 PM
  #12  
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ttocs
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Default RE: Quick Underdrive Pulley Question

bump your idle up a little(100-200rpms) and you will not have any problems.
Old Sep 10, 2007 | 05:15 PM
  #13  
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Black95MustangGT
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From: Fredericksburg, Virginia
Default RE: Quick Underdrive Pulley Question

im going to put them on i dont care about the charging problem, i have a brand new optima red top battery and a brand new alt.

Anybody know the exact size of the belt? And why a smaller belt?
Old Sep 10, 2007 | 06:47 PM
  #14  
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95gtdrop
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Default RE: Quick Underdrive Pulley Question

no. you just use the stock style belt. i have mac u/d on my ride. and i had no idling problems.
i have aalmost stock 95.
Old Sep 10, 2007 | 06:50 PM
  #15  
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tmajikman
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From: Woodstock, GA
Default RE: Quick Underdrive Pulley Question

whats the highest the idle should be, I am at 850 rpms and I don't want to idle to high.
Old Sep 10, 2007 | 07:26 PM
  #16  
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WhiteWindsor
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From: Warner Robins,GA
Default RE: Quick Underdrive Pulley Question

ORIGINAL: tmajikman

I don't even have underdrive pullies on my fox and when I turn on the a/c, electric fan, headlights and barely run my stereo, my lights get dim as hell, and thats with a 2 month old 200 amp alternator. I still can't understand what the hell is going on with my charging system.
Have you checked to make sure you have good grounds, and low gauge wire.
Old Sep 10, 2007 | 07:51 PM
  #17  
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Black95MustangGT
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From: Fredericksburg, Virginia
Default RE: Quick Underdrive Pulley Question

well instead of putting them on, went to the shop thats fixin my car and they said i really shouldn't put them on, i would love to but im just not trying to deal with any headaches. gonna sell them.

Selling them for 50+ shipping
Old Sep 10, 2007 | 08:51 PM
  #18  
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samseed101
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Joined: Jun 2006
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From: Maine
Default RE: Quick Underdrive Pulley Question

Why did they say not to put them on? Lots of people run them all the time and seem to like them. And they seem to hold up beter on the SN95s than they do on the foxes (mostly due to the electrical issues.)
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