One thing with gear installation is shimmin of the pinion gear in order to get the proper pattern on the Ring gear---Thats done using white grease and seeing where the pinion is riding on the Ring. Not to hi and not too low.Second is shimming of the ring assy so as to have the proper back lash--Not to deep ,,not too shallow. Just takes a little patience. But a good gear man can kick it out.

 

Thanks a ton guys. I think I'll check around local a bit more. I called one speed shop, but as soon as I mentioned Nissan they shut me down. I'll check some tranny shops next. Sorry for hijacking the thread as well.

 

Since ur from N/A I cant offer any suggestions----Diffs are soooo simple but can get sooooooo Fugged up if put in the wrong hands---Ull think ur being chased by a Rabid Howler Monkey on steroids

 

lol...after break in and everything mine is making more knocking noises with my Mobil 1 fluid. I am going to be switching to Redline w/ the friction modifier, but I am starting to think I want to take the whole thing back out and put it at 60% lock cause 80% is getting kind of annoying.

 

Awesome write, good post. Can I ask why you chose this diff over the other choices out?

 

I ran Mobil 1 for a day in mine...I promptly switched it out as it made a racket. I have successfully run Castrol Dino oil (std weights) and now run some funky Motorcraft stuff at the recommendation of a buddy.

No way I could ever tolerate 80% - way too brutal, and if you are driving the car on the street at all, it's not what you want nor need.

 

Well I was able to get the diff/bearing/seals all brand new for 1000 shipped from a guy in the FS section. I also liked it because it is sprung unlike the Cusco MZ/Nismo, so it won't be quite as loud and/or harsh. If I couldn't get the deal I did I probably have gone with the louder Nismo LSD anyway, just because of price.

I daily drive this car about 100miles/day M-F and it is my only car, so yeah 80% is starting to wear on me. Reverse is the worst if you are turning out of a parking spot...ughh...I just started backing up straight, pushing in the clutch, then turning.

I actually had a guy stop me at an auto-x when I was just cruising to the start and told me my wheel was wobbling and thought it was going to fall off...it ends up it was just the inside wheel locking like it always does

Once again...moral of this story kids...put your differential at 60% lock if you are driving on the street....and Mobil 1 fluid makes for a loud Diff.

 

Ive heard good things about Royal Purple diff fluid, why is Mobil 1 so loud Ive never heard this before...how hard is it to adjust the locking %?

 

Yup, we just installed another Cusco diff, and 60% lock is great for the street. Another customer has a 100% lock Cusco and its too harsh for my tastes, although he still enjoys it.

We having started using Motul lubricants exclusively, and we have a Motul 75-90 Sythetic gear oil that does a nice job.

 

Whats it cost for the Motul 75-90? I was about to order some more Redline 75W-90 for my Nismo diff. I tried Amsoil last time and my diff feels like it did with the Veruspeed fluid. CLanky, loud, and overbearing. So far the best fluid I've used is Redline but am willing to switch.

 

To adjust the locking % is more involved than chaning the LSD in alone. You must drop the pumpkin, remove the lsd, take the ring gear off, open up the lsd, rearrange some plates, then put it all back together. Not fun.

I have no idea why the mobil 1 is loud. I would also like to hear motul pricing, because I was about to buy some Redline this week, but I may hold off.

 

Motorcraft SAE 75W-140 High Performance Rear Axle Lubricant is what I've been using for a year now - best stuff I've had in there so far . I just looked and it cost me $16 a quart.

 

$17.00 for 2 liters (qts) which is all you will need. We recommend the 90weight LSD specific oils for clutch style LSD's.

 

hmm... i never had any real noise issues with Mobil1 and the Cusco... just once in a while a few poping noises but nothing extremely annoying...

let me know how the redline goes- maybe i'll try that next..

 

I'm definitely going to set mine at 60%. Also how do you change between 1.5 and 2 way. I want to be certain I've set mine properly at 1.5.

 

Great job on the DIY install!
I've had my nismo diff for about two years now and have experimented with different fluids. Before you go and switch the lockup percentage, give redline or royal purple a try. They've got about 5% diff additive already in them. If it is still too loud put some sta-lub (cheap at kragen) or half a bottle of redline diff additive. You will have to change the fluid at every oil change (or every track day) to keep it running smooth. Mobile1 does not have any friction modifier in it and is not really suited for clutch type lsd's. I put a whole tube of friction modifier in my diff to quiet down the mobil1 and it worked for about one week. I tracked it and basically toasted the fluid. I drained like water.
The good thing about the nismo is you can change the lockup without dissassembly. I'm currently on 80%, but think 60% was good enough for a dual purpose car.

 

My RS is not bad at all on the noise and mobil 1, just on very slow tight turns. Mine is set to 60% too.

 

getting mine installed next wednesday. going to set it up at 60%.

 

I've run my Cusco RS restacked @ 60% for a few months now. Very nice. Almost like having an advanced mechanical traction control. Huge improvements on corner exit and launching in the wet is also better.

I didn't bother with a break-in as per instructions. I did change the oil after 500 km (Redline synthetic both times) and there was a noticeable improvement in smoothness.

The unit is very quiet. My UR flywheel is still easily the noisiest mod on my car.

The only issue I have with the diff is that if I'm slowly taking a tight corner or slowing letting the clutch out from a standstill, there's a lot of drivetrain shudder. It's almost like the diff is too agressive for the OEM rubber tranny/diff mounts.

 

Planning to install a Nismo LSD. Did you use a dial indicator or other special tools?