After suffering with the clunk/Grinding noise from my Cusco rear, I drained the
synthetic oil and put in regular Valvoline 85/145 wt. gear oil along with 4oz.
(Ford friction modifier) and the clunking is nearly gone.

Can't believe I put up with the noise for 3k miles before I finally changed to regular gear oil with the friction modifier.

 

you wanna drain that, it might render your LSD useless shortly.

EDIT: Using anything other than the recomended oil is dangerous, the additive alone is probably what changed the noise.

 

NOPR

Do you have personal experience using the different types of rears.
(torsen vs. cusco) etc. and their lubricants ?

Not being a smartass, just don't want to drain it if there's no basis for your recommendation.

Jack

 

Isn't it supposed to make the clunking noise? My kaaz did and thats how I knew it was working how it was supposed to. If it isn't making noise, then I would guess that you are changing the way its working. I'm no expert, however.

 

i know of a few people that have used the ford friction modifier to quieten diffs with some success, however the noise always returns after a couple of months of driving

 

My brother has a kaaz 2-way, and you're only supposed to use the kaaz fluid, anything else could harm the friction plates. Everyone else seems to think the additive wont hurt anything, so i'd use the recomennded fluid and an additive. also, a proper break-in (figure 8's) helps with the noise.

 

jag, how is your kaaz setup? mine is at 100%. pretty harsh for the street. i understeer in slower turns. i spoke to KDR and they said they would recommend 33% for open track/autocross, and 66% for drag racing. so i want 33% but i don't know anyone else who uses kaaz for RR/AX like i intend to.

 

2MCH

I bought my cusco rear from a private party.
I called a cusco dealer in Il. who told me it needed no break-in and it needed no
special oil.
I didn't know that they could be setup for more or less understeer. (Who the hell
would choose understeer !) Sure doesn't inspire much confidence in fast sweepers. (The fast sweeper on Pocono's north course comes to mind)
Btw, KDR set mine up. Wish I would have known there were other ways to set it,
other than 2-way.

 

jagwrjack- I talked to cusco about oil. They told me the same as you, no break in and no required oil. I am using redline 75w90. Did a bunch of figure eights. And I really don't have many issues. Although it was bad for the fist couple thousand miles.

Now about the 2way understeer issues. Here are quotes from cusco's website:

1.5 way LSD: Activates under acceleration while the under-steer under deceleration is less than on a 2 way LSD. Recommended for those who have a hard time with under-steer.

Two way LSD: Recommended on rear wheel drive cars and AWD rear axle cars. Activates on both acceleration and deceleration. Recommended for those who prefer aggressive driving and big angle drifting.

With CUSCO's LSD, you may change the setting during your overhaul with no additional parts required

Also check out http://www.napsusa.com/lsd.htm
It explains diffs. And the difference of cusco's RS and MZ models.

 

kaaz literature says 100%, 66%, and 33%. the diff is the same, but you rearrange the clutch paks to achieve the different %. so its all the same unit.

how is that different from cusco's 2 way, 1.5 way, 1 way? are these different units, or just like the kaaz, only the configuration of the clutch paks is different?

 

If you are pushing in the turns you need more throttle. In other words be more agressive, and rotate the car with the throttle. If you cannot, you do not need a 1.5 IMHO. It is completely different from running a street car. Read in the Race Technique section on the subject. GL Carl