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Old 08-10-2019, 11:45 PM #1
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When to change front diff oil?

So I changed front/rear/t-case oil on my 2016 4Runner @ 20K miles. She's at 60K miles now. I changed out the rear diff fluid today, Using Mobil 1 Synthetic 75W90 Gear oil again.

Do I need to change the front out as well? I don't get to use 4X4 nearly as much as I'd like.

thanks
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Old 08-11-2019, 05:10 AM #2
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I would. Its only $12.99 a quart where i am at. I would do Front and Center diff together. Cost is $39 plus tax. Why not have the extra protection?
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Old 08-11-2019, 11:55 AM #3
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Quote:
Originally Posted by pahaf91 View Post
I would. Its only $12.99 a quart where i am at. I would do Front and Center diff together. Cost is $39 plus tax. Why not have the extra protection?
Simple DIY? Simple as a flush and fill?
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Old 08-11-2019, 11:56 AM #4
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Quote:
Originally Posted by pointman View Post
Simple DIY? Simple as a flush and fill?
Yeah pretty simple. I've done it before. Problem is it's August in the South east so hot and humid as hell for a couple more weeks.

May wait till a little cooler weather.
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Old 08-11-2019, 11:57 AM #5
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Nope. I changed my front diff and T/C at 48k then at 94k. Should be easily able to do 60k intervals if you don’t do water crossings. Up to you.
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Old 08-11-2019, 02:42 PM #6
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Quote:
Originally Posted by pointman View Post
Simple DIY? Simple as a flush and fill?
Yes it is. For the center diff, it's a 24mm plug for drain and fill.

Front diff is a hex key. And you have to remove the front skid plates to get to them. The only issue.

The front and center diff both take about 1.5 quarts.
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Old 08-11-2019, 08:20 PM #7
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Quote:
Originally Posted by pahaf91 View Post
Yes it is. For the center diff, it's a 24mm plug for drain and fill.

Front diff is a hex key. And you have to remove the front skid plates to get to them. The only issue.

The front and center diff both take about 1.5 quarts.
Perfect detail. Thank you!
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Old 08-12-2019, 08:16 AM #8
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I get lazier on the front diff than on the T case and the rear. The rear gets nasty by 30K, the T case, well, that's so easy why not do it when doing the rear. The front though, it always comes out perfectly clean so I go a little longer. Same for the wifes ride.
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Old 08-12-2019, 10:32 AM #9
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Quote:
Originally Posted by kenwilliams0803 View Post
I get lazier on the front diff than on the T case and the rear. The rear gets nasty by 30K, the T case, well, that's so easy why not do it when doing the rear. The front though, it always comes out perfectly clean so I go a little longer. Same for the wifes ride.
I changed my diffs and TC at around 60k. Rear diff and T-case were dark. The front diff was pretty clean though. I'll probably end up changing all again at around 100k.
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Old 08-12-2019, 11:52 AM #10
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I agree with this, I like doing my own maintenance. However, on a selectable driveline, you don't need to change the front now. You're in a good spot to drive 30,000 miles, then do both.
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Old 08-13-2019, 04:27 PM #11
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Had a little whine in the rear diff in my 2018 SR5.
Changed lube at 15k miles using Valvoline synthetic 75w-90 (highest MIL Specs). Really surprised there was almost 1/8" of babbit on magnetic drain plug. Rear end pretty quiet now,.. will do front & transfer case at 30k miles as an insurance policy. Transmission @ 50k miles and will add aftermarket cooler (or earlier if I start to tow).

Good luck!!
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