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Old 04-20-2008, 09:43 PM #1
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Is running Mobil 1 Syn 75W-90 in Front Diff bad?????

I realized half way through filling that I had grabed the wrong fluid and didn't have enough of the correct weight to finish the job so i finished with the 75W-90.

Is it bad to run this in the front diff?

If bad, will it atleast last for a 700 mile road trip until i can change?

Thanks in advance!!!
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Old 04-20-2008, 10:40 PM #2
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im running that same weight in my front diff with arb locker

i dont think its bad, depends on where you live.

it handles cooler temperatures better, i run valvoline though.

should be fine.
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Old 04-21-2008, 01:29 PM #3
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Thanks! I suspected it was close enough. I in Atlanta, so the heat is more of a concern that the cold. So unless someone gives me a good reason, i'll leave it in till the next change. It doesn't see much action since it's the wife's daily driver.

Does the gearing in the front diff constantly spin/turn during normal 2wd?

Would there be any reason for concern about excessive heat in the front diff if used 98% of the time in the city (2wd)?
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Old 04-21-2008, 10:53 PM #4
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Quote:
Originally posted by grillian
Thanks! I suspected it was close enough. I in Atlanta, so the heat is more of a concern that the cold. So unless someone gives me a good reason, i'll leave it in till the next change. It doesn't see much action since it's the wife's daily driver.

Does the gearing in the front diff constantly spin/turn during normal 2wd?

Would there be any reason for concern about excessive heat in the front diff if used 98% of the time in the city (2wd)?
is yours a v6 part time 4wd or a v8 all time?

though your CVs are turning in part time mode, the ADD has a sleeve in the diff that keeps the gears from turning until you engage 4wd and that sleeve moves over to engage the CVs and then your driveshaft and case have it in 4wd basically.

so inless its v8, nope not turning
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...2001 4runner sr5 sport pkg...

current mods: 35" baja mtzs,5 stars, OME 883 front coils TG sliders, tjm 15 front bumper, painted silver, yakima rack with loadwarrior, arb air lockers front and rear, inchworm 5:1 case with twinsticks. croyed gears and output shafts. 4.56 gears

things to get: rear bumper and tire carrier, 35s, heated seats, new roof rack, finish custom turbo setup.
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Old 04-22-2008, 10:10 AM #5
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V6 part time.
Excellent! Just another bit of comfort knowing things aren't spinning in there full time. I'll be sure and use the heavier weight oil in the rear diff since it see constant usage.
Thanks for the help, much easier and more friendly than the audiworld guys who have grown tired of questions from mear mortials with only a limited knowledge of hardcore mechanics.
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Old 04-24-2008, 08:40 AM #6
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I'd bet $5 that if you had your diffs dealer serviced 70% of dealers would pump the same 75w-90 in both diffs...
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Old 04-25-2008, 12:08 AM #7
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I have been using 100% Mobil 1 75w-w90 in both of my 03 differentials and transfer case for several years. works great.
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Old 04-30-2008, 06:43 PM #8
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running 75-90 RP in both front and rear diffs with RP Synchromax manual tranny fluid in the transfer case. No issues
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