Firekiller Posted February 15, 2011 Report Share Posted February 15, 2011 Hello guys, One question for you all. After all the discussion on engine oil and trans oil, I have decided to go with the redline and amsoil tranny fluid, but what was mentioned about the rear diff fluid. I cant remember after all the different threads and topics on them which one was mentioned. Could someone post up what the best diff fluid was please and thank you. Link to comment Share on other sites More sharing options...
shel-b001 Posted February 15, 2011 Report Share Posted February 15, 2011 Hello guys, One question for you all. After all the discussion on engine oil and trans oil, I have decided to go with the redline and amsoil tranny fluid, but what was mentioned about the rear diff fluid. I cant remember after all the different threads and topics on them which one was mentioned. Could someone post up what the best diff fluid was please and thank you. Royal Purple. Link to comment Share on other sites More sharing options...
08 ORANGE SS-725HP Posted February 15, 2011 Report Share Posted February 15, 2011 Amsoil SAE 75W-140 Severe Gear Synthetic Gear Lube. Either use (1) 4oz. bottle of Amsoil's Slip-Lock Differential Additive or Ford's Friction Modifier to 4 pints of 75W-140 Severe Gear. Link to comment Share on other sites More sharing options...
Firekiller Posted February 16, 2011 Author Report Share Posted February 16, 2011 Thanks guy's, going to do just that. Thanks for info and fast reply. Link to comment Share on other sites More sharing options...
6-Speed Posted February 16, 2011 Report Share Posted February 16, 2011 I used Royal Purple 75W140 without any additional friction modifier. Can't really say it's the best out there, but it's good enough for me and it's available locally. Link to comment Share on other sites More sharing options...
JWG223 Posted February 16, 2011 Report Share Posted February 16, 2011 I had a Trans Am with 75K miles on it. I put RP 75W-140 in it, and in another 10K miles the pinion bearing spun and the rear-end had to be re-built, and it looked like there had been a lot of heat in there as the gears were discolored in a way they weren't when the RP went in. Was it the RP? No way to know. I just know I don't plan on using it anymore. Factory fill is just fine. I have never heard of a rear-end wearing out due to lubricant failure when filled correctly with the correct fluid. Same for engines, transmissions, and anything else requiring lube. A perfect example are my AR-15's. The military uses CLP. They have M16's that have gone through numerous barrels. Yet I use LaRue MG lube, or other proprietary blends. Because it makes me feel better. My AR's have been 100% except for one Colt CAR-15 A3 which had seen well over 1000 rounds between lube/cleanings, and that same rifle again when firing non full-length resized reloads through it (fail on my Dad's part). I guess my point is, there is a lot of debate over how to prevent 2-5% wear on a part that will outlast the rest of the car. Much like wrapping an anvil in velvet and not wearing gloves to hold the hammer. Link to comment Share on other sites More sharing options...
TN Red Snake Posted February 16, 2011 Report Share Posted February 16, 2011 The AMSOIL helped to quieten my rear-end whine. Link to comment Share on other sites More sharing options...
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