Can the 3.9 final drive go onto the 07 z? just got one and the gears are too long.

Thanks

 

yes it is the same diff.

 

There is a member with the 4.08.

He likes it.

If I were you i would get the 4.08.

03-06 Z's ~ 3.9

07+ Z ~ 4.08

Just my opinion

 

where do i get the 4.08 from and do i need a limited slip for it

 

mynismo.com

 

thanks

 

Personally I'd get the 3.9 to retain some decent gas mileage. Either way you can't go wrong, and it'll be MUCH faster

 

I was going with exhaust as my next mod but the 3.9 seems like the obvious choice now.

 

how would a 4.08 be on a 04??? what kind of 0-60 and mph in gears 1-5?

 

Since MPG is ~~= to rpms a decent rule is to apply the gear ratio, if 20% higher ratio expect some like 15-20% lower MPG in steady cruise [highway] MPG.

The are some variable since volumetric efficiency changes with rpm and load.

Acceleration is ~~= to the cube root of ratio increase 20%= ~3.1% less any extra time spent shifting into an extra gear.

 

the final drive on a stock 07 is the same as the 03-06 right

 

the FD on the 07 G sedan is 3.7 (I'm pretty sure the 08 coupe is too)... the Z will probably have that as well?...

 

The 07Z has the same final drive as 03-06, they didn't change it as in the G coupe. I have the 3.9 in mine, and I would have took this as an option from the factory if it existed. I haven't had a chance to put too many miles on the new gears yet, but the car is much more lively. RPM's are up about 300 in each gear at steady speed compared with the 3.5. Haven't had enough time to see the hit on mpg.

ncdoc

 

I've got the 4.08 and if you're going N/A in an 07, it's the FD to use.

 

can you order the final drive already in the lsd because i have a base model and i am guessing that i need an lsd to use the 4.08 fd

 

and also how long does it take to get in usually? is it like a month wait or sooner

 

with the 4.08, at what speed 1st gear end (hit redline) ?