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DIY: manual transmission and rear differential fluid service

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DIY: manual transmission and rear differential fluid service

 
Old 08-20-2016, 02:21 PM
  #21  
CDH76
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I noticed my redline said automatic transmission on it not manual. I ordered it from the link you posted though. Assuming it's the same as yours?
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Old 08-20-2016, 02:31 PM
  #22  
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You have the correct fluid.
Originally Posted by CDH76 View Post
I noticed my redline said automatic transmission on it not manual. I ordered it from the link you posted though. Assuming it's the same as yours?

Last edited by Kracka; 08-20-2016 at 02:32 PM.
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Old 08-21-2016, 06:17 PM
  #23  
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Finally got around to this today in my '15 Z51 A8. This was at 9,500 miles of street driving, no track time.

A flex head ratchet is a MUST. I used a 3" extension for the fill plug and a 10" extension for the drain plug.

Not sure if there is a difference between the A8/M7, but there are some heat exchanger lines with little radial fins by the drain plug that are a PITA to work around. No way to remove the plug without denting the fins slightly.

Overall it took me about 1.5 hours, mostly because I was pondering how to deal with the cooling lines. Eventually I just said F-it, and went after it. Turned out fine. Doing over could do in an hour or less.



Fill Plug access:











Drain plug access:










Here you can see how the extension dents the radial fins:





And the mess it makes... I used brake cleaner to clean up afterwards. And I'd remove the plastic air deflector next time...




Fill Plug:



Drain Plug:



Drain Plug:




This is the Plews pump from amazon and the GM LS oil. The pump got 99% of the oil from the bottles. I was impressed!




The fluid that I drained didn't look like this!


Last edited by xp800; 08-21-2016 at 06:19 PM.
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Old 03-24-2017, 05:18 PM
  #24  
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Kracka,

Shouldn't you have used Dexron-VI in your eLSD per the Z51/Z06 manual?
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Old 03-24-2017, 05:41 PM
  #25  
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Originally Posted by Hobie14 View Post
Kracka,

Shouldn't you have used Dexron-VI in your eLSD per the Z51/Z06 manual?
That would be for the hydraulic portion, which doesn't need regular service nor is it a drain & fill fluid. I used the factory gear oil.
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Old 03-25-2017, 10:49 AM
  #26  
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Great instructions & thanks.

Doing mine today.The trans is EZ,but the diff fill is almost impossible to get to on my '17 Z51.

I'll let the dealer do that part.

\db2

Last edited by dbaker; 03-25-2017 at 10:50 AM.
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Old 03-25-2017, 05:17 PM
  #27  
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I'm in the process of doing mine now. Waiting on friends who made a trip to Napa to get some hose so we can fill it. The drain and fill plugs were not that hard to get to. What surprised me was how easy they came loose. Not tight at all. Mine is a 2016 z51 with about 8k miles. Wanted to get that "break in " stuff out. Drain plug Was covered with fine silver metallic colored sludge. Both plugs are magnetic. See pict below.

Update. I did not have those radiator cooling fins nor the plastic air deflectors on mine. The top fill plug is difficult to get back in as there is oil coming out making everything slippery.

No pump here, learned a new trick. Cut a hole in the bottle cap to fit the hose so it won't leak. Once the bottle is upside down and the other end of the hose is in the fill hole have someone poke a hole in the bottom of the bottle which is now in the up position and put you air hose on it with low pressure and the oil will flow right into the hole.



Last edited by Ammo; 03-25-2017 at 07:52 PM.
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Old 03-27-2017, 11:32 AM
  #28  
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Originally Posted by Ammo View Post

No pump here, learned a new trick. Cut a hole in the bottle cap to fit the hose so it won't leak. Once the bottle is upside down and the other end of the hose is in the fill hole have someone poke a hole in the bottom of the bottle which is now in the up position and put you air hose on it with low pressure and the oil will flow right into the hole.


I had a plastic bottle pump that broke before I got he hose filled, so I improvised by attaching air compressor with control nozzle to the top of the bottle... The fill hose also goes into the cap of the bottle and to the bottom of the bottle, so you can apply air to the top of the fluid to push the fluid down and out the fill tube. You can watch the fluid level and control the speed of the fill... No leaks since the fill tube is in the bottle.




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Old 10-17-2017, 10:44 AM
  #29  
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After a 1 year 7 months/14k miles and plenty of aggressive driving, the Redline D4 was ready to be changed out. The transmission was getting very notchy and lost that smoothness I loved. Drained it out and it was still red in color with no metallic flakes which was a good thing to see. I pumped in a fresh gallon of the D4 (I ordered from Walmart.com this time around) and now I'm back in business! I took it for a nice drive last night and it's feeling as good as ever once again

I did not do the differential fluid this time around; I figure I'll do that with every-other transmission fluid service.

Last edited by Kracka; 10-17-2017 at 10:46 AM.
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Old 10-17-2017, 10:41 PM
  #30  
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Thanks for writing this up Chris. Its a good reminder that I am due to check mine. I think I am overdue for diff fluid change (53K) and cannot remember if I had it changed when the M7 trans fluid was done. Regardless, I think I am going to do both of them here either this weekend or next..
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Old 10-17-2017, 10:50 PM
  #31  
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Originally Posted by FYREANT View Post
Thanks for writing this up Chris. Its a good reminder that I am due to check mine. I think I am overdue for diff fluid change (53K) and cannot remember if I had it changed when the M7 trans fluid was done. Regardless, I think I am going to do both of them here either this weekend or next..
It's also an important reminder that I'm not as young and agile as I used to be... My neck is now stiff and I need to make a chiropractic appointment HAHA
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Old 10-19-2017, 09:59 PM
  #32  
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Thanks for the write up OP and all the other contributions from various members. I have a couple of these AC Delco 75W 90s with the limited slip friction modifier in the basement. I track my 1LE so I change the rear end fluid fairly often on that. Same fluid as the vette. The bottles have a “use by” stamp on them, but no actual dates. I have to order new ones regardless because my z51 needs 3, but do these fluids have some magic expiration dates? Thanks
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Old 10-19-2017, 11:14 PM
  #33  
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Originally Posted by ls3zob View Post
Thanks for the write up OP and all the other contributions from various members. I have a couple of these AC Delco 75W 90s with the limited slip friction modifier in the basement. I track my 1LE so I change the rear end fluid fairly often on that. Same fluid as the vette. The bottles have a use by stamp on them, but no actual dates. I have to order new ones regardless because my z51 needs 3, but do these fluids have some magic expiration dates? Thanks
Mobil states a shelf-life of 5 years for a sealed bottle of oil.
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Old 10-19-2017, 11:27 PM
  #34  
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Originally Posted by Kracka View Post
Mobil states a shelf-life of 5 years for a sealed bottle of oil.
Thanks brother
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Old 10-21-2017, 02:29 PM
  #35  
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Thank you all! All done.

HOWEVER, after pumping in the 3 quarts (pump gets about 98% of everything out of the bottle), I had to go downstairs and grab a 4th bottle. I pumped in maybe 1/8th of the bottle and stopped. Still no fluid coming out of the fill plug. Not used to this. On my other cars, its full when it starts coming out of the fill. PLEASE HELP, did I underfill? Overfill?
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Old 10-21-2017, 02:31 PM
  #36  
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It will drain out of the fill hole once full. Make sure the car is as close to level as possible and combine the residual oil from the 3 bottles together and pump that in as well.

Last edited by Kracka; 10-21-2017 at 02:34 PM.
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Old 10-21-2017, 02:43 PM
  #37  
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Thanks, fluid started coming out. Instead of combining the leftovers in all 3 bottles, I grabbed a 4th and filled 1/8th of that bottle. I guess fluid started to come out,so theoretically I’m all set right?
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Old 10-21-2017, 02:49 PM
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Originally Posted by ls3zob View Post
Thanks, fluid started coming out. Instead of combining the leftovers in all 3 bottles, I grabbed a 4th and filled 1/8th of that bottle. I guess fluid started to come out,so theoretically Im all set right?
Yes sir, good to go! Let it drain out until its just a slow drip then reinstall the fill bolt.
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Old 10-21-2017, 03:40 PM
  #39  
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Thank you much. All set. 3,400 miles, metallic looking fluid. Glad it’s done. Now that the initial breakin is over and I have fresh fluid, won’t touch it for a few years. Same with my Camaro, the first one at 3k was horrible looking fluid. I’ve changed several times since, (because of track use), but even with heavy use, the fluid has never looked as bad as the original change.
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Old 10-21-2017, 03:43 PM
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Agreed that the initial break-in fluid change is the most important, and should be done at the shortest interval!
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