Transmissions and Drivetrain Need help with your trans? Problems with your axle?

85W140,75W140, or 75W90

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Old Dec 10, 2009 | 04:58 PM
  #1  
charlietransam's Avatar
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Joined: Jul 2009
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From: Brooklyn,NY
Car: 1984 Trans am
Engine: V8
Transmission: Auto
85W140,75W140, or 75W90

have a 84 trans am dont know which of the following gear oils to add. can any1 help me? 85W140,75W140, or 75W90
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Old Dec 10, 2009 | 05:16 PM
  #2  
Saabster's Avatar
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From: Greater D.C. area.
Car: 89 Camaro RS
Engine: LO3 TBI
Transmission: 700R4 => WC T-5
Axle/Gears: 3.42 Open Diff
Re: 85W140,75W140, or 75W90

To your rear? 75W90 would do the trick.
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Old Dec 10, 2009 | 06:28 PM
  #3  
fastcars's Avatar
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Joined: Apr 2006
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From: Ontario, Canada
Car: '92 Camaro RS
Engine: 454 Multi-port EFI Big Block
Transmission: T5-anyone have a T56 for sale?
Re: 85W140,75W140, or 75W90

Stay away from 140 weight gear oils if you're running a limited slip posi with friction discs. It don't work so well, found out the hard way last week.
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