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Friction Modifier

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Old Jan 7, 2008 | 10:03 PM
  #1  
Goldenpony's Avatar
Goldenpony
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Joined: Jun 2005
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Default Friction Modifier

I want to change the rear end lube in my '85 Mustang GT with LSD. Do I add the old XL-7 additive or the newer XL-3? I have both.
Old Jan 9, 2008 | 06:39 AM
  #2  
corvetteguy's Avatar
corvetteguy
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Joined: Nov 2005
Posts: 544
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Default RE: Friction Modifier

If the servce manual calls for it then do it.
I can't see harm in putting it in.

I am sad to say my 89 GT 150K miles with me
putting on 75K had never a trans or rear end fluid
change. I think I would have helped the new owner
by changing it at least once. But for $1800 he got
a good deal.
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