Rear axel lube

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Dec 19, 2007 | 10:23 PM

Goldenpony

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5th Gear Member

Joined: Jun 2005

Posts: 3,319

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Rear axel lube

Will it hurt anything to replace the 75W90 gear oil with 75W140 in my '85 Mustang GT with limited slip?

Dec 21, 2007 | 01:58 AM

johnnyhou

1st Gear Member

Joined: Aug 2007

Posts: 71

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RE: Rear axel lube

Not really sure about the viscosity issue, but the friction aditive for the limited slip is a must.

Dec 22, 2007 | 11:22 AM

Goldenpony

Thread Starter

5th Gear Member

Joined: Jun 2005

Posts: 3,319

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RE: Rear axel lube

speaking of the friction additive, what's the difference between the Ford additive XL-7 and XL-3? I know I should use the XL-3 in my '06 GT, but what about my '85 GT?

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