diff. fluid?? synth or std oil

johnmcgt · 06-03-2003, 04:10 PM

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

mustangII460 · 06-03-2003, 04:50 PM

Synthetic, it will also make clutches in posi units lock up quicker.

V8Mustang · 06-04-2003, 06:23 AM

I would use standard oil for the first 300-500 miles after the rebuild, then change it and run synthetic.

302 LX Eric · 06-04-2003, 07:58 AM

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

Ackbar00 · 06-04-2003, 11:21 AM

I know with my Eaton, it said do NOT use synthetic. But mine is not a clutch type so I really dont know.

johnmcgt · 06-05-2003, 06:31 PM

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

06-03-2003, 04:10 PM	#1
johnmcgt Registered Member Join Date: May 2002 Location: Florida Posts: 31	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 __________________ K&N: 2.5" Flows(3-chmbr) & Offroad H-Pipe: Underdrive Pullies: Eibach Pro springs: KYB shocks/struts: Pro3I C/C plates:

06-03-2003, 04:50 PM	#2
mustangII460 Factoy Five Roadster Join Date: May 2000 Location: Sevier Co,Tennessee Posts: 1,681	Synthetic, it will also make clutches in posi units lock up quicker. __________________ Frank

06-04-2003, 06:23 AM	#3
V8Mustang Registered Member Join Date: Mar 2003 Location: NC Posts: 64	I would use standard oil for the first 300-500 miles after the rebuild, then change it and run synthetic. __________________ www.CRmotorsports.com Ford Performance Parts

06-04-2003, 07:58 AM	#4
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	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 __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

06-04-2003, 11:21 AM	#5
Ackbar00 Rebel Fleet Commander Join Date: Oct 2001 Location: Huber Heights, OH Posts: 1,003	I know with my Eaton, it said do NOT use synthetic. But mine is not a clutch type so I really dont know. __________________ 1993 Mustang GT, PTK w/ T-64 - My Cardomain Webpage 11.25@123.5 on only 8 psi. 10.84@121 on only 1 headgasket "The Truth is, Your the Weak, and I am the Tyranny of Evil Men!"

06-05-2003, 06:31 PM	#6
johnmcgt Registered Member Join Date: May 2002 Location: Florida Posts: 31	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 __________________ K&N: 2.5" Flows(3-chmbr) & Offroad H-Pipe: Underdrive Pullies: Eibach Pro springs: KYB shocks/struts: Pro3I C/C plates:

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