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4.10 gear diff. fluid?

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Old 02-09-2009, 05:59 PM
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98GTstang
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Default 4.10 gear diff. fluid?

What kind of differential lube do you guys recommend with ford 4.10 gears? What weight..ect. Thanks for the input.
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Old 02-09-2009, 06:30 PM
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lizzyfan
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Old 02-09-2009, 06:35 PM
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Soldier GT
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+1 on the Royal Purple. If you're gonna spend that much money go with the best. Go to your local I forgot what weight I put in my diffs but you can go to your local Oreiley's OR Autozone and they will tell you exactly what weight you need.
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Old 02-09-2009, 06:43 PM
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WhiteFoxGT
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I've always used Ford 75-140, and a bottle of friction modifier. Royal purple I hear is good stuff, however I have never used it
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Old 02-09-2009, 06:55 PM
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Originally Posted by WhiteFoxGT View Post
I've always used Ford 75-140, and a bottle of friction modifier. Royal purple I hear is good stuff, however I have never used it

Oh yeah forgot about the friction modifier not a must but something that would reall make a new gear install a success.
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Old 02-09-2009, 07:12 PM
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the friction modifier IS a must if u have posi...which all gts do
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Old 02-09-2009, 07:17 PM
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Originally Posted by Davojan59 View Post
the friction modifier IS a must if u have posi...which all gts do
Well I must have gotten lucky (which I'm sure I did). When I had 373's I didn't add friction modifier and had no issues. That's some good info man.
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Old 02-09-2009, 07:28 PM
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mustangman02232
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75W90 dino (usually run valvoline as what the local store has)
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Old 02-09-2009, 08:05 PM
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now if you use royal purple, do you have to get any friction modifier? because it says that no additives are needed.
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Old 02-09-2009, 08:18 PM
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Originally Posted by disturbdgt View Post
now if you use royal purple, do you have to get any friction modifier? because it says that no additives are needed.
I guess you could be right. When I installed the 373's the mechanic didn't ask for the friction modifier. When I installed the 410s (with a different mechanic he wouldn't install them unless I bought the friction modifier). I bought Royal Purple on both installs and with or without the friction modifier haven't had any issues.....
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