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Thread: DIY Front Diff pic by pic fluid change for AWD

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    OMG's Avatar
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    DIY Front Diff pic by pic fluid change for AWD

    For those with AWD this is technically part 2 of my diff fluid change I did this while I waited for the rear diff fluid to drain

    Now this is a lot harder because there's just a ton of more crap you have to deal with in a much tighter space.

    Things you'll need.

    Tools:
    10mm Hex socket
    Ratchet (this is where a flex head is ideal!!)
    Drain pan
    Pump

    Supplies:
    Towels
    Fluid
    1.5pints GL-5

    The hardest part about this is really just the fill plug is a little hard to access too. I found the easiest way was to feed the tool through the side of wheel well then your hand through another hole in the wheel well to position the 10mm socket into the plug. It's a little hard to explain so I will lt a bunch of pictures explain. Once you pop it out it has a little bit of drainage.











    After you get the plug off it's just the drain plug now!



    A quick video of the drain cause I thought it was cool.

    http://s1030.photobucket.com/user/om...88183.mp4.html



    Sadly I forgot to take a picture of pumping the fluid back in. But it's pretty straight forward.

    Hope this helps people if you were thinking of doing it! Hopefully next week I'll get the transfer case done.


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    Tbbt is online now Cadillac Owners Connoisseur
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    Re: DIY Front Diff pic by pic fluid change for AWD

    OMG,

    Great write up! Thanks for taking the time to do this! What fluid did you use?

    Marv

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    OMG's Avatar
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    Re: DIY Front Diff pic by pic fluid change for AWD

    Quote Originally Posted by Tbbt View Post
    OMG,

    Great write up! Thanks for taking the time to do this! What fluid did you use?

    Marv
    OMG sorry I never got back to you on this, but I used Royal Purple Max Gear 75w90 which honestly now I think I'm starting to regret.

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    Why?

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    OMG's Avatar
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    Re: DIY Front Diff pic by pic fluid change for AWD

    A whine has developed in my rear LSD diff. Which at first I thought was a wheel bearing. After replacing all 4 and realizing only one of them was bad you can really hear the whine. It was advertised to have the Limited Slip additive already added. Well I went to the GM dealership and purchased the limited slip additive and added it. It has reduced the noise after about 30 miles, but it's still there just not as loud. After searching on the forums a bit, it seems that when the noise comes it's not fixable unless the diff is replaced or a crazy procedure is done.

    Tires still have a lot of meat left in them so I don't want to drop $600 on replacing them based on a theory.

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    Douglas Rome is online now Cadillac Owners Fanatic
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    Re: DIY Front Diff pic by pic fluid change for AWD

    OMG, you are a man after my own heart, good job!
    thanks, Douglas

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    Z71's Avatar
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    Re: DIY Front Diff pic by pic fluid change for AWD

    The noise is a result of the meshing of the rign and pinion gears. They claim this is normal noise of the Getrag Axle that is being transfered into the passenger compartment. They will ONLY replace it if the customer complains vehemently. Of course thats only if you have warranty left...


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    OMG's Avatar
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    Re: DIY Front Diff pic by pic fluid change for AWD

    Quote Originally Posted by Z71 View Post
    The noise is a result of the meshing of the rign and pinion gears. They claim this is normal noise of the Getrag Axle that is being transfered into the passenger compartment. They will ONLY replace it if the customer complains vehemently. Of course thats only if you have warranty left...

    Yeah whine came up after the warranty expired in July. It's too cold for me to tackle this now and with classes in full bore I'll check it out myself come next may. Hot a couple of things in mind.

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    karstman7 is offline Cadillac Owners Member
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    Re: DIY Front Diff pic by pic fluid change for AWD

    thanks for great pics and DIY - I'm going to tackle this over the weekend

  11. #10
    OMG's Avatar
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    Re: DIY Front Diff pic by pic fluid change for AWD

    Quote Originally Posted by karstman7 View Post
    thanks for great pics and DIY - I'm going to tackle this over the weekend
    Good luck! It's an easy job for sure!

    Also wanted to update everyone that the whine was indeed my tires awhile back (like a year ago). P-Nero's. Replaced with the Hankook Ventus. Cadillac quiet again.

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    Backinblack11 is offline Cadillac Owners Fanatic
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    Re: DIY Front Diff pic by pic fluid change for AWD

    I currently have the P-Nero's also and I am not impressed with the road noise and thumping I am getting from these tires. I have always had great luck with Cooper tires so that's what I will be putting on mine when they are due

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    Re: DIY Front Diff pic by pic fluid change for AWD

    I have a 2011 CTS4 with 86k miles. I had the dealer drain/fill the trans around 50k. I plan on having the trans serviced again around 100k along with the differential and possibly the transfer case fluid. I read where the transfer case has an obstruction that makes a fluid change difficult? Tinman, I know this was discussed in a prior thread, I just can't find it.

    I have the GM fluid part numbers (trans- 89021677), with the 4oz (LS additive - 88900330). I see Mobil One has a product with the limited slip additive already mixed in (Mobil 1 104361 75W-90 Synthetic Gear Lube - 1 Quart)

    This thread is a few year old, but I noticed that OMG was concerned that he did not have enough LS additive when he used Royal Purple Max Gear 75w-90 with LS already added. Turns out, the noise was from his tires.

    Any good/bad experiences using a non GM all-in-one gear lube with the LS already mixed in?

    Also, any updates on servicing the Transfer Case would be helpful.

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    toothpaste is offline Cadillac Owners Member
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    Re: DIY Front Diff pic by pic fluid change for AWD

    Quote Originally Posted by OMG View Post
    Good luck! It's an easy job for sure!

    Also wanted to update everyone that the whine was indeed my tires awhile back (like a year ago). P-Nero's. Replaced with the Hankook Ventus. Cadillac quiet again.
    The fact that you got your socket AND ratchet in there is AMAZING.

    I ended up getting my hand in thru the opening next to the exhaust.

    I used a 10mm hex key, got it into the fill plug, then hooked onto it with a box wrench.

    I was just screwing around not ready to do the actual fluid change. Once I saw the fill plug start to turn, I immediately grabbed it with my hand and tightened it (just hope its tight enough).

    May go to harbor freight and pick up the hex set and flex head ratchet just to see whether it will make the job any easier.

    An oh, I am going to be using the Amsoil Severe Gear 75W-90:

    Last edited by toothpaste; 05-19-17 at 12:24 AM.

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    toothpaste is offline Cadillac Owners Member
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    Re: DIY Front Diff pic by pic fluid change for AWD

    When I opened the rear fill plug, there wasnt any "excess" fluid unlike the front.

    When I opened the front fill plug, quite a bit of fluid came pouring out.

    After filling the rear, I waited until the excess fluid essentially came to a slow drip before replacing the plug.

    I left a little more fluid in the front diff since there was so much to begin with. I replaced the plug once the fluid came to a medium paced drip.


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