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Old 06-03-2003, 04:10 PM   #1
johnmcgt
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Question diff. fluid?? synth or std oil

Hey all,

I have a quick question, I am not rebuilding my rear end yet but am going to in the far future.
At this time I am replacing leaking rear cover gasket.
I am going to use synthetic without friction modifier. Anyone have an opinion either way??
Use std gear oil or Synthetic, all opinions welcomed.

John
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Old 06-03-2003, 04:50 PM   #2
mustangII460
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Synthetic, it will also make clutches in posi units lock up quicker.
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Old 06-04-2003, 06:23 AM   #3
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I would use standard oil for the first 300-500 miles after the rebuild, then change it and run synthetic.
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Old 06-04-2003, 07:58 AM   #4
302 LX Eric
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I used Amsoil (synthetic) and one bottle of Ford Friction Modifier in my rear-end that I just finished up a few weeks ago. I upgraded my 8.8 with an Auburn Pro unit, Moser 31 spline C-clip axles, 3.73 ring and pinion, T/A performance girdle/cover with ARP stud kit.

No problems here.

Happy motoring.

E
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Old 06-04-2003, 11:21 AM   #5
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I know with my Eaton, it said do NOT use synthetic. But mine is not a clutch type so I really dont know.
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Old 06-05-2003, 06:31 PM   #6
johnmcgt
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Default just returned

Hey everyone,

Thanks for the extra info, I just changed my oil and put synthetic back in. The speed shops I talked to said with synthetic I dont need modifier. I have a couple of hundred miles on it and it acts same as before.
When I rebuild I am not sure what setup I will go with stock rebuilt or other type posi unit but either way I know more about rear end fluids now.

Thanks,

John
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