what do you mean by crunching? I put Lucas 75w140 in my diff per BMW TIS due to noise when turning hard corner, but was planning on using that as a flushing agent until I found the best diff fluid to replace it with. I'm still getting a little of that particular noise after car sits for a few weeks and there is some clunking going on back there when shifting slowly at low speeds, not exactly sure what it is, I think its just a noisy design working as it should???? At moderate acceleration all sounds great. so, I said all that to differentiate what you mean by crunching????I'd recommend the Redline 75w140 for the diff. I tried Valvoline 75w140 and it didn't like it, it may be that particular diff though, as it still crunches a bit with the Redline in it. Other car runs beautifully with Redline. Flakka, can you elaborate on the Redline d4 atf in the smg? Why is it better? I'm running Redline MTL now, I'd expect you to say it's thinner so synchros work better on a cold trans?
Ok, we're talking about the same thing then. The Lucas did a good job at taking care of that for me, but I just let the car sit for about 2.5 weeks while rebuilding rear suspension and took it out for a spin yesterday and got a bit of that. I chalk it up to the car for sitting still that long.Growling noise when turning a hard corner. The plus side of this is that one knows that the LSD clutches are working!