I took some quick photos of the Quaife QDF9V ATB Differential compared to the OEM unit during my install. I also weighed each of the units. The Quaife unit is approximately 3.5 lbs heavier than the OEM unit.

Quick Note: Besides the LSD unit, you'll need the following OEM parts to successfully complete the install on a C63.

Qty 2 - MBZ 230 997 03 46 (Mercedes Benz Seal Ring - Interior Flange)
Qty 2 - MBZ 001 989 17 03 10 (Mercedes Benz OEM Differential Fluid)
Qty 1 - MBZ 003 989 98 20 10 (Mercedes Benz Sealant)

Much thanks to James@ACGSD for providing a great deal on the LSDs and a simple parts list/install kit for the installs. You've got four very happy customers up in the PNW.

Quaife (Left) and OEM (Right)


Quaife (Left) and OEM (Right)


Quaife ~19.5 lbs


OEM ~16.0 lbs

Good job as usual and thanks for the info...

Woot! Thanks for the pics and info, Lubey!

Nice SuperL. Did you get the AMG heatsink? Since you have the pumpkin open, you might as well install it.

No, I did not opt for the cooler.

If I recall correctly, you need the heatsink, a new cover and a couple bolts for roughly $200. Certainly a nice option for those interested.

thank you for the information. How extensive was the install? Did the quaife drop in easily? Any more details would be awesome, if I need to send a PM, please let me know.

Is the heatsink built into the new diff cover or is it a separate piece, internal or external, a picture would be greatly appreciated, thanks.

Out of curiosity...anyone know why the OEM diff has two flat spots...is that to balance it...don't believe I have ever noticed that before..

should really pick this up for my buddy !

r u sure that is a oem lsd? looks like to me that is a open diff!

Any significant benefit over OEM re: the Quaife? Either way, thanks for the solid write-up.

The install took 4-5 hours. I had a local MB Tech do the job. You should PM or call James@ACGSD. He can cover all of your install questions.

A quick search for heatsink in this sub-forum will provide you with the info on the cooler.

I never mentioned an OEM LSD. Not sure where you got that.

If you have an OEM LSD, I don't think there is much of a need to go with a Quaife unit.

If you don't have an OEM LSD, the Quaife is an inexpensive and equitable alternative.

Have you heard of any warranty issues with replacing LSD? I asked my dealership service about putting one in for me. I just posted a thread with MB mechanic saying there is.

Excellent review Superlubricity....how does the car feels during take off?

Thanks, nice write-up on the diffs.



The AMG heatsink is a bolt-on for those who have the correct diff cover. Here’s a pic for those that are interested.




.

What an amazing deal on a great mod...enjoy...another topnotch SL addition to the knowledge base too!

No. In fact, one of our local dealers was going to do the installs untill we found a less expensive alternative.
Both tires are certainly spinning. The traction difference is most noticeable on the corners. Reminds me a lot of my '06 M5.

[QUOTE=superlubricity;4055637]No. In fact, one of our local dealers was going to do the installs untill we found a less expensive alternative.

Thanks superlubricity. Appreciate the input. Wondering if this was a way the master mechanic wanted to get out of doing it because he hasn't done it before. Kept on going on about the spider gears made exactly for this car etc.

Also thanks for the great post on your install. I guess I should just get the Quaife from James and hunt for someone who knows what they are doing to do an install.

I had a Quaife LSD ATB on my GTI before. I must stay after you put this on!!

the car feels totally different!!! the way how the car reacts very different especially when you take it to the track! it so much more responsive!

its a must !! for people who likes to go tracking.

the empty looking one is stock for sure! I did the same mod on my GTI

the Quaife ones look closed.

but mine was a ATB so... I'm not sure if its a ATB or a 1.5way??

What a good review. Thanks one more time for sharing.

hi Superlubricity, are these the exact same parts I needed on a W211 E63 as well? thanks

Qty 2 - MBZ 230 997 03 46 (Mercedes Benz Seal Ring - Interior Flange)
Qty 2 - MBZ 001 989 17 03 10 (Mercedes Benz OEM Differential Fluid)
Qty 1 - MBZ 003 989 98 20 10 (Mercedes Benz Sealant)

I really thought that I could get away without an LSD until we went to Sebring this weekend. The lack of acceleration in the middle of the three hairpins was BEYOND frustrating and the rear would want to snap when the free spinning tire gripped again.

When you say that "the rear would want to snap..." are you saying that the axles felt like they may break or are that when the "free spinning tire gripped again" the rear of the entire car wanted to correct itself abruptly in a snapping fashion?

Any feedback would be appreciated. I'm also thinking about getting this mod. I don't plan on tracking my car but I'm thinking it's a must for the strip.

Hi guys! I am owner of c63 coupe and I have broken differential. I'm going to buy the same but I am not sure what extra parts I should but so it can fit to my car.