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Old 01-22-2018, 01:12 PM   #1
awdmofo
 
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2013 LS M6 rear diff fluid

I have 76k miles on my 13 V6 6-speed manual Camaro. I believe the rear diff fluid is recommended by GM to be replaced at 60K. Has anyone done it before and what fluid was used? I don't mind paying for the high price of GM fluid, just not sure if there is another aftermarket that is recommended for my car. After some tuning, more bolt on parts I'd assume the HP would be in the 380-390 range (flywheel not to the wheels). Any help would be great, thanks!
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Old 01-22-2018, 02:30 PM   #2
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You should have done this fluid about 70,000 miles ago. That stock stuff was DISGUSTING after a few thousand miles.

I change mine every other spring, it's super easy to do. You'll need 1qt of 75w-90 gear oil and a bottle of GM posi fluid. (https://www.amazon.com/Genuine-88900.../dp/B0028CMPIS)

You should do the transmission fluid at the same time. It uses the same 75w-90 fluid that you decide to use in the diff. You'll need about 2qts for the trans.

I went with Mobil 1. You can choose whatever full-synthetic 75w-90 that you want.

In the end, your check-list would be:
3 qts of 75w-90 gear oil. (4 if you want to be on the safe side and might spill some)
4oz of GM additive
1 pump to move the oil.
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Old 01-22-2018, 07:41 PM   #3
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I used Mobil 1 gear oil and just did mine today. Ramps on the rear and jackstands for the front. Both axle and tranny were easy but a learning experience. 3 quarts filled both perfect with the friction modifier for the axle.
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Old 01-23-2018, 05:46 PM   #4
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I used Royal Purple. Had the Diff and Tranny done at the same time.
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Old 01-24-2018, 06:20 PM   #5
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I prefer Redline GL5 75W-90 for my trans and differential. Works like a charm.
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Old 01-24-2018, 06:33 PM   #6
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Quote:
Originally Posted by 1Coopgt View Post
I used Royal Purple. Had the Diff and Tranny done at the same time.

I second the Royal Purple and did it myself. easy job
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Old 01-26-2018, 09:14 AM   #7
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Lucas non-synthetic.
And it's never to late to change it.
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Old 01-28-2018, 01:55 PM   #8
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Quote:
Originally Posted by ChibiBlackSheep View Post
You should have done this fluid about 70,000 miles ago. That stock stuff was DISGUSTING after a few thousand miles.

I change mine every other spring, it's super easy to do. You'll need 1qt of 75w-90 gear oil and a bottle of GM posi fluid. (https://www.amazon.com/Genuine-88900.../dp/B0028CMPIS)

You should do the transmission fluid at the same time. It uses the same 75w-90 fluid that you decide to use in the diff. You'll need about 2qts for the trans.

I went with Mobil 1. You can choose whatever full-synthetic 75w-90 that you want.

In the end, your check-list would be:
3 qts of 75w-90 gear oil. (4 if you want to be on the safe side and might spill some)
4oz of GM additive
1 pump to move the oil.
Sheep, great info thanks as always . I was thinking of just getting https://www.amazon.com/ACDelco-10-40...lon+oil+75w-90 since its original to the car. Thoughts? I don't mind spending a little more to keep the fluids the way the engineers meant it you know. Im afraid what the rear diff will look like when I drain it . might pump some fluid through the diff to catch any nasty stuff in there before I fill it up, thought for the price just get a gallon.
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Old 01-28-2018, 02:00 PM   #9
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Quote:
Originally Posted by 1Coopgt View Post
I used Royal Purple. Had the Diff and Tranny done at the same time.
switching to Royal purple for the engine oil next oil change, used it on my turbo toyotas and stock tacoma and loved it. Never used any other fluids of theirs though, i imagine its good stuff.

Quote:
Originally Posted by DSX_Camaro View Post
I prefer Redline GL5 75W-90 for my trans and differential. Works like a charm.
My buddy i believe is a distributor for them, might look into redline.

Quote:
Originally Posted by Avenging Orange View Post
Lucas non-synthetic.
And it's never to late to change it.
they make non-synthetic?
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Old 01-28-2018, 03:20 PM   #10
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Quote:
Originally Posted by awdmofo View Post
Sheep, great info thanks as always . I was thinking of just getting https://www.amazon.com/ACDelco-10-40...lon+oil+75w-90 since its original to the car. Thoughts? I don't mind spending a little more to keep the fluids the way the engineers meant it you know. Im afraid what the rear diff will look like when I drain it . might pump some fluid through the diff to catch any nasty stuff in there before I fill it up, thought for the price just get a gallon.
Not a bad deal, and nothing wrong with sticking to ACDelco. Honestly just keep up on swapping this fluid out, you will see how easy it is to do, and just do it every other year or at least every 30,000 miles.

As long as your rear-end isn't howling, you shouldn't need to do a "flush" to it. Just make sure you clean the magnet well, and do a few figure-8s after you put the diff fluid in to get it moving all around.

And make sure you wear gloves and hold your breath... this stuff stinks!
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Old 01-28-2018, 04:34 PM   #11
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I've been putting this off for a year. Thinking it would be hard and messy.

Just did it yesterday on my SS M6, trans and diff. Super easy. Hardest part is getting the car up on jackstands, then operating the little pump I bought to pump in the new juice to my transmission. It was a little messy, but that was my bad for missing the mark to catch the trans fluid

I had to use ATF for the SS M6 trans fluid, I used amsoil for that. I used Mobile 1 75-90 LS for the diff, with a little GM ls additive.

Wow, shifting is much improved, very much needed. I'm still not thrilled with the diff performance, but at least I know the fluid is fresh. I had the usual accumulation of metal on the magnetic plugs. I've got an eaton truetrack waiting to go in when I find a good shop to do it.
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Old 01-28-2018, 04:37 PM   #12
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Quote:
Originally Posted by ChibiBlackSheep View Post
...
And make sure you wear gloves and hold your breath... this stuff stinks!
You're not kidding. That was some funky smelling stuff.

My 9 year old was "assisting" me in the garage and he was gagging from the smell. But he stuck it out
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Old 03-11-2018, 10:04 PM   #13
awdmofo
 
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Quote:
Originally Posted by bkevind View Post
I've been putting this off for a year. Thinking it would be hard and messy.

Just did it yesterday on my SS M6, trans and diff. Super easy. Hardest part is getting the car up on jackstands, then operating the little pump I bought to pump in the new juice to my transmission. It was a little messy, but that was my bad for missing the mark to catch the trans fluid

I had to use ATF for the SS M6 trans fluid, I used amsoil for that. I used Mobile 1 75-90 LS for the diff, with a little GM ls additive.

Wow, shifting is much improved, very much needed. I'm still not thrilled with the diff performance, but at least I know the fluid is fresh. I had the usual accumulation of metal on the magnetic plugs. I've got an eaton truetrack waiting to go in when I find a good shop to do it.
Yea it's time for me to do it, with school and work and life i'm neglecting the car I spent soo much to buy 11 months ago . I got the GM additive from Amazon for cheap, but I've been reading that most of the 75w90 gear oils have the friction modifier already in them. Did the mobile 1 have it in it? Was thinking of redline, amsoil or royal purple for the trans....
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Old 03-17-2018, 07:04 PM   #14
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Originally Posted by awdmofo View Post
switching to Royal purple for the engine oil next oil change, used it on my turbo toyotas and stock tacoma and loved it. Never used any other fluids of theirs though, i imagine its good stuff.



My buddy i believe is a distributor for them, might look into redline.



they make non-synthetic?


I've had two friends spin rod bearings with royal purple. I'll never waste money on it. Redline all day for me.
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