Rear axle fluid replacement a maintenance need? - GMC Acadia Forum: AcadiaForum.net
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post #1 of 20 (permalink) Old 03-02-2011, 01:39 PM Thread Starter
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Rear axle fluid replacement a maintenance need?

Hi all -- When I went to get an oil change, the mechanic told me I needed to get a rear axle fluid change, too, since it needed to be done at 30,000 miles. My 2008 Acadia SLT has 37,000 miles on it now. In looking at the maintenance list for this car, it doesn't indicate anything any changing the rear axle fluid. Anyone know whether this is required and, if so, what number of miles it needs to be changed? Thanks for any input!

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post #2 of 20 (permalink) Old 03-02-2011, 02:04 PM
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Re: Rear axle fluid replacement a maintenance need?

this is from my 2010 manual... i removed the mention of the air filter and trans.. but AWD shows

First Engine Oil Change After
50,000 Miles
. All‐wheel drive only: Transfer
case fluid change (severe
service) for vehicles mainly
driven when frequently towing a
trailer, or used for taxi, police,
or delivery service.

2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L - 60,000
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post #3 of 20 (permalink) Old 03-02-2011, 05:42 PM
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Re: Rear axle fluid replacement a maintenance need?

Sounds like your dealer/mechanic is using the "Dealer Profit Service Recommendation Mileage" instead of the GM Schedule of Maintenance Mileage that rbarrios has posted. The manual is showing 50000 miles for the transfer case fluid change under SEVERE DUTY.

The transfer case that is mentioned is on an AWD Acadia, and is located in the front of the vehicle. The rear fluid would probable have an even longer service life and may actually never even require changing.

Unless you do constant towing, police or taxi service (excessive prolonged idling) or have driven in water deep enough to cover the transfer case or rear axle on your AWD, you will be fine without doing any fluid changes for a while yet.

And if you don't have an AWD, then you really know the mechanic is looking to line his pocket with your money!

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post #4 of 20 (permalink) Old 03-02-2011, 07:08 PM
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Re: Rear axle fluid replacement a maintenance need?

Maybe your service advisor will have you get the muffler bearings repacked, too!

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post #5 of 20 (permalink) Old 03-02-2011, 07:11 PM Thread Starter
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Re: Rear axle fluid replacement a maintenance need?

Hi -- Thanks for your responses. If I'm understanding you correctly, unless I'm using my AWD car to tow things or other strenous uses, then there's no need to change the car's rear axle fluid? Great news. (-: Thanks for your reply. Joyce
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post #6 of 20 (permalink) Old 03-02-2011, 07:14 PM
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Re: Rear axle fluid replacement a maintenance need?

jb, just be sure the fluid level is always checked when you go in for regular service.

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post #7 of 20 (permalink) Old 06-15-2011, 11:51 PM
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Re: Rear axle fluid replacement a maintenance need?

If you are a DIYer, replacing the rear differential fluid is easy. You'll need a 3/8" hex drive, GM 75w-90 Hypoid Fluid (grape smell!), and a jack.

I just changed my rear differential fluid at 41k miles. The fluid that drained out was black, and the drain plug magnet had black gunk on it. I cleaned the magnet, and re-installed the drain plug. I used a $6 hand pump (sourced from Autozone) that fits the 32 oz. gear lube container, to fill the rear diff. through the fill plug, until the fluid began to weep out the bottom of the fill plug hole. I tightened both plugs to 26 ft-lbs.

I completed the job in 30 minutes - 15 minutes was spent waiting for the fluid to drain out.

My advice for AWD owners - change your transfer case and rear differential fluid (same 75w-90 fluid) @ or before 50k miles. The amount of gunk on the magnet for the rear diff. and the blackness of the fluid (new fluid is clear) convinced me this servicing is worthwhile.

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post #8 of 20 (permalink) Old 06-19-2011, 09:59 AM
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Re: Rear axle fluid replacement a maintenance need?

I am at 50k (or slightly more) now. The rear differential is fairly straightforward, but I have searched the site and cannot find much info on the transfer case. Does anyone have a picture of the correct nut(s) to remove to drain and refill it? Thanks!

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post #9 of 20 (permalink) Old 06-19-2011, 09:31 PM
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Re: Rear axle fluid replacement a maintenance need?

Here is a link to the online repair catalog. Hope it works....

http://sm.gpona.com:9001/si/showDoc....5#tab2-1760569


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post #10 of 20 (permalink) Old 06-19-2011, 10:30 PM
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Re: Rear axle fluid replacement a maintenance need?

Quote:
Originally Posted by MedicRxDoc
Here is a link to the online repair catalog. Hope it works....

http://sm.gpona.com:9001/si/showDoc....5#tab2-1760569

Nope...I got a system error message when I clicked the link. Thanks, though...

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