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Old 08-25-2022, 04:53 PM #1
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Changed rear diff fluid today

Today I hit 29k thousand miles on my 4Runner. I decided to change my rear diff fluid at 29k miles. My 21 Tacoma rear diff went out at 8k so I decided to change my 4Runner as a precaution. My question is should I wait until 50k to change the transfer case and front diff since I hardly put it in 4 wheel drive? I used 75w90 gl5.


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Old 08-25-2022, 04:53 PM #2
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Old 08-25-2022, 05:36 PM #3
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I'm doing everything at 50K including the transmission.
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Old 08-25-2022, 05:47 PM #4
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I don't have a 4R yet - but owned a 2013 FJ Cruiser from new until 2021. The FJ's owners manual said to run 4WD for a few (10?) miles every month. I did this maybe 8 months of the year. I did not offroad much.

Does the 4R require the same?
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Old 08-25-2022, 05:49 PM #5
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Does the 4R require the same?
Yes I believe all Toyota 4wds recommend this but it's just good practice to exercise your 4wd. Just find a straight road.
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Old 08-25-2022, 06:27 PM #6
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I don't have a 4R yet - but owned a 2013 FJ Cruiser from new until 2021. The FJ's owners manual said to run 4WD for a few (10?) miles every month. I did this maybe 8 months of the year. I did not offroad much.

Does the 4R require the same?
My FJ manual stated the same as both of my T4R's............... once a month for 10 miles.
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Old 08-26-2022, 03:56 AM #7
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Quote:
Originally Posted by Sgb020 View Post
Today I hit 29k thousand miles on my 4Runner. I decided to change my rear diff fluid at 29k miles. My 21 Tacoma rear diff went out at 8k so I decided to change my 4Runner as a precaution. My question is should I wait until 50k to change the transfer case and front diff since I hardly put it in 4 wheel drive? I used 75w90 gl5.


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Interesting your rear diff went out at 8k on your taco; I changed my rear diff fluid on my 2019 4R at 3k and it was under filled from factory. Lots of metal shavings and the fluid was shot. I would defiantly change the T-case and front diff.
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Old 08-26-2022, 05:22 AM #8
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I did both diffs and t-case at 25k on a 2019.

Truck saw consistent 4WD usage in that interval.

Rear diff fluid was similar to OP in color, no metal shavings.

Front diff and t-case were honey gold still.

I did not send the rear oil out for analysis but judging by the color alone, it needed to be changed. I would not say my truck sees severe usage but there are months at a time I am in 4WD or on dirt. Another note, I have no breather extension on the rear, had a few deeper crossings but noticed no water contamination when draining.
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Old 08-26-2022, 07:27 AM #9
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Quote:
Originally Posted by Sgb020 View Post
Today I hit 29k thousand miles on my 4Runner. I decided to change my rear diff fluid at 29k miles. My 21 Tacoma rear diff went out at 8k so I decided to change my 4Runner as a precaution. My question is should I wait until 50k to change the transfer case and front diff since I hardly put it in 4 wheel drive? I used 75w90 gl5.


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Yes. I go 50K on both differentials and transfer case using Mobil Delvac Synthetic 75w90. 306K miles on the truck.
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Old 08-26-2022, 08:11 AM #10
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Quote:
Originally Posted by Hammer0313 View Post
Interesting your rear diff went out at 8k on your taco; I changed my rear diff fluid on my 2019 4R at 3k and it was under filled from factory. Lots of metal shavings and the fluid was shot. I would defiantly change the T-case and front diff.
This is a good reason for all new owners, whether brand new, or new to you, to check all fluid levels soon after purchase.
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Old 08-26-2022, 09:26 AM #11
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Good info. Just hit 35K on my 2018 and this is on my to do list. Been getting reminders from the dealership to do all 3 and an injector service for a total of $500..I think I'll be doing it myself..
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Old 08-26-2022, 09:53 AM #12
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on my 17 TRDP, i did both front and rear diffs at 15k miles, now just about at 45k miles and will both diffs, transfer case and trans now.

brake fluid i also do every 2 years regardless of miles

but one other fluid people always for get about is doing the power steering fluid which gets very dirty and is overlooked. Valvoline MAXLIFE atf is a good choice for PS fluid
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Old 08-31-2022, 01:44 PM #13
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Nice.

I'm a big fan of changing the diff and trans fluids more often than recommended. I like Amsoil in the diffs, but have used Valvoline in my SxS and it's made that rattling drivetrain nice and quiet.
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