Hey all, i've decided I want to go through with it and get the 4.08 gears done to my 07 Z and read the whole gearing thread but I was wondering if anyone has these gears on a base 350Z without an LSD and maybe some advice as to whether I should pay the $1300 plus install to get an LSD. Thank you in advance for any info

 

Yes.

 

Yea it saves you alot in the long run. I'm in the same situation and plan to buy the Cusco.

 

Somone was selling the 4.08 gears with the OEM Diff together, how much cheaper are the OEM differentials? For some reason I cant find them just by google. I guess ill be spending big money

 

I have a 05 base 350z with 4.083 fd and a cusco RS lsd ... Don't buy the cusco lsd if your car is not a race car, cusco lsd is amazing for racing but too noisy for street driving

 

yes, but get the quaife and you'll be happy.

 

So saving some dough and getting the OEM Diff isnt a good idea?

 

Stock VLSD:
Good: Relatively inexpensive, and not noisy at all
Bad: Won't hold lots of power, not adjustable
Aftermarket diff (Cusco, Nismo, Quaife)
Good: Will hold much more power, and are adjustable
Bad: Expensive (usually $1000 and up), noisy for daily driving (except the Quaife)

 

stock VLSD

Good: cheap (when bought used) and quiet
Bad: minimal lockup, that only gets worse as they get older (eventually going down to behaving just like an open diff). Same labor to install this vs something actually worth having

Aftermarket diff

they are not all noisy by any means - it all depends on:

1. which differential - the Cusco for example does not have to be harsh or obnoxious, and can be barely noticeable in parking lot maneuvers. The OS Giken is extremely smooth, and with their fluid, is not noisy whatsoever. Other units, like the NISMO are more aggressive.

2. how they are setup (as far as lockup %, if adjustable)

3. what fluid is used. Get it right, and they are nearly silent, as in you would be hard pressed to notice it's there unless someone pointed it out to you. Get it wrong, and it's obnoxious.

4. availability - the Cusco was a great unit for the price but is not brought into the US anymore on a regular basis. We're only air'ing them in now on a special order basis, 1 by 1. We've moved to stocking the OS Giken now

Is an LSD worth having? All depends on the perspective of the buyer and their budget. I've said this many times before, but out of everything I have ever done to my car, the LSD remains the best single mod I've ever done. No ifs, ands of buts about it. It completely transforms the car (I started out with the stock viscous fwiw, and now run a Cusco, and have a Quaife in the new rear I am installing soon).

Is a stock LSD worth installing to a base? Hard to say - if it came out of a low mileage car and is basically at or near no cost, and comes with the output shafts, then yes. If neither of those, then it's a toss up IMHO. I don't think it is worth spending any meaningful money on though. The downside to the aftermarket units is the cost. If the car is going to see track or auto-x time, then yes, I think it's a very worthwhile upgrade, bordering on essential. For a pure street car, daily driver that you're just doing some basic mods to, it's nice to do, but not essential.

 

Hey Adam, can the OS Giken LSD replace the factory vlsd w/o any additional parts?

 

https://my350z.com/forum/drivetrain/...lock-lsds.html



it's a drop in for a base, for VLSD cars, 1 output shaft needs to be changed.

 

Thanks for the info Z1! Yeah the guy on here Z ology is selling me the whole pumpkin with the OEM LSD and 4.08 gears setup inside, I'd be dropping it into my base Z, im strictly street with little freeway driving, just wanted to have even more amazing low end power but didnt want to make the mistake of having an open diff. So this sounds right to me! thank you!

 

Will the Quaife ATB work with a 06 5at g35 coupe with a 3.3 open diff?? looking to swap FD as well to 3.7 or 3.9

 

If you're swapping to a 3.7 or 3.9 or 4.08 you need the Quaife for a manual transmission car, if you're keeping the 3.3 you need the Quaife for an automatic transmission car. We offer both, as well as the final drives too, and all the required parts, whenever you are ready

 

oh what a **** i have purchased two cusco lsd any way no need to worry i am living in my farms

 

Adam,

What fluid do you find works best with your Cusco to keep it smooth and quiet?
Do you carry the OS Giken fluid, I didnt see it listed on your site? Cost?


Jerry

 

I'm not Adam but I can answer to this.. ( I put about 50K miles on my cusco diff)

quietest fluid so far: redline 75W90 GL5 (standard with friction modifier)
second best: motul PA90 + half bottle of redline friction modifier

but the ABSOLUTE best mod to keep the diff quiet... really sticky tires.

 

You find the redline quieter then motul? I have the nismo with just motul no modifer. Quieting it down just a little would be nice lol. Maybe I'll drain a lil out and put some of the modifier in.

 

Good thread. I'm saving up right now for the Quaife LSD and Gears too

 

right now I have the cusco set at 80% 1.5 way, with motul and friction modifier.. on R-comps it's quite even at full steering lock getting in the garage.