Rear Diff Fluid

[SynisterAZ]

Its formulated for the carbon clutch discs in the diff and Im pretty sure its the same fluid as was used in the SS since I remember that stuff being pricey as well.

 

[techdude99]

I had good luck with the GM fluid in my ZLE. Used it in my other cars too

 

[Grainofsand]

Anyone NOT change their diff fluid? I got the fluid and all but I really don't feel like doing it. I don't ever plan to track my car. I'm currently at 5K miles, and have been putting off the change. I might just do it at 40K. Thoughts?

 

[Deneed4spd]

Anyone NOT change their diff fluid? I got the fluid and all but I really don't feel like doing it. I don't ever plan to track my car. I'm currently at 5K miles, and have been putting off the change. I might just do it at 40K. Thoughts?

It is so easy to change the fluid. I changed mine at 1800 miles and it was full of metal fine particles. I’m sure you will be fine not doing it but doesn’t hurt. BMW M cars have their diff changed tracked or not tracked at 1200 miles.

 

[Jim2000]

Anyone NOT change their diff fluid? I got the fluid and all but I really don't feel like doing it. I don't ever plan to track my car. I'm currently at 5K miles, and have been putting off the change. I might just do it at 40K. Thoughts?

I would not go past 30k for changing the diff fluid and perhaps at 20k is a better idea. After that, just follow the maintenance schedule.

 

[techdude99]

What is the schedule? On my ZLE it was 1500 for the first. I can't find it for the CT4 in the high performance supplement unless I missed it.

 

[Jim2000]

What is the schedule? On my ZLE it was 1500 for the first. I can't find it for the CT4 in the high performance supplement unless I missed it.

My local dealer recommended changing the diff at 30k. So I would assume do it again at 60k and 90k.

 

[Dirkbg]

What is the schedule? On my ZLE it was 1500 for the first. I can't find it for the CT4 in the high performance supplement unless I missed it.

My local dealer recommended changing the diff at 30k. So I would assume do it again at 60k and 90k.

Both the normal and severe maintenance schedule show 45k for the limited slip differential. I show the severe below because that should be the shortest time period, but in this case they are the same. I don't know about any supplemental instructions for such things as racing use, but this should apply for typical normal use.

 

[Orange Whip]

I changed my 4BW rear diff oil out tonight at just over 3k miles. I did it without jacking up the car (and I'm a big fat guy). Just needed to scoot under the back as far as i could go and stretch out my arm + use a 6in extension. Mine took about 1.5 quarts before it started dripping from the fill hole.

Anyone know the torque specs on the fill and drain plugs? I snugged them up with a ratchet, but would prefer to have them torqued to spec.

View attachment 22404

This is probably a noob question, but what do you use to channel new fluid to the upper fill hole?

 

[Metal4all6]

This is probably a noob question, but what do you use to channel new fluid to the upper fill hole?

Just need a hand pump - something like this:

Slippery Pete 5cc Hand Pump Transfers Gear Oil, Transmission and Differential Fluids From Quart Bottles (Not for Red Line Quarts) (1)
https://a.co/d/h7ebWYQ

Then you just screw it on to the diff fluid bottle and pump it in. Takes a while to pump it all in, but little to no mess.

 

[Orange Whip]

Thanks! Can anyone whos has a quart of AC Delco 19418501 handy confirm that it has a "normal" sized opening?

 

[Metal4all6]

Yep, it should fit. The one I linked above is what I used on the AC Delco diff fluid.

 

[mfbmike]

Changed out rear diff fluid with the AC delco product shown in here with the proper part number a few days ago. Easy peasy. Used about a bottle and a half - until it started weeping out of the fill hole then torqued everything down once it turned to a slow drip.

 

[AC2024]

Thanks! Can anyone whos has a quart of AC Delco 19418501 handy confirm that it has a "normal" sized opening?

Yes, any quart size transfer pump will fit.

 

[AC2024]

Changed out rear diff fluid with the AC delco product shown in here with the proper part number a few days ago. Easy peasy. Used about a bottle and a half - until it started weeping out of the fill hole then torqued everything down once it turned to a slow drip.

I just did mine after 1500 miles. Dirty dirty black fluid with a bit of sheen. Ill probably do it again around 10k miles because its so easy and then probably every 30k.

So glad we actually have a drain plug!

 

[MookdocOE]

I just did mine after 1500 miles. Dirty dirty black fluid with a bit of sheen. Ill probably do it again around 10k miles because its so easy and then probably every 30k.

So glad we actually have a drain plug!

I commend your due diligence! I will now show you what I did!

 

[MookdocOE]

Here is mine after the new plug installed. Absolutely, remove that crap fluid and install a proper plug people! Is there a factory magnet inside on the case? I would bet 100% there is but this guy goes 100% above and beyond 100%

 

[BKC1]

What model number Turner plug is that? Is it this one?

https://www.turnermotorsport.com/p-593924-turner-magnetic-drain-plug-m22x15-14mm-hex-socket-head/

I personally use a Gold Plug AP-04 on the LF4 drain port, which is great. On the TR-6060, I wasn't happy with what was available (nothing in stainless or titanium with a really strong magnet) so I wound up getting the Gold Plug IP04X, which protrudes from the side of the TR-6060. When my next batch of oil comes in I'll see whether it clears the trans tunnel.

 

[MookdocOE]

What model number Turner plug is that? Is it this one?

https://www.turnermotorsport.com/p-593924-turner-magnetic-drain-plug-m22x15-14mm-hex-socket-head/

I personally use a Gold Plug AP-04 on the LF4 drain port, which is great. On the TR-6060, I wasn't happy with what was available (nothing in stainless or titanium with a really strong magnet) so I wound up getting the Gold Plug IP04X, which protrudes from the side of the TR-6060. When my next batch of oil comes in I'll see whether it clears the trans tunnel.

I will have to look? I have magnets all over my vehicles and somebody awhile ago chimed in. All you do is just buy one on internet and use it what's the big deal? Hey, it's a big deal and actually a really big deal to somebody like me who cares about Break in processes on mechanical devices. The plug I used is modified along with heavy duty copper crush washer. Things just aren't good enough in my world.

 

[MookdocOE]

What model number Turner plug is that? Is it this one?

https://www.turnermotorsport.com/p-593924-turner-magnetic-drain-plug-m22x15-14mm-hex-socket-head/

I personally use a Gold Plug AP-04 on the LF4 drain port, which is great. On the TR-6060, I wasn't happy with what was available (nothing in stainless or titanium with a really strong magnet) so I wound up getting the Gold Plug IP04X, which protrudes from the side of the TR-6060. When my next batch of oil comes in I'll see whether it clears the trans tunnel.

Correct, I just cross referenced your plug to my invoice! That's the one!