final gear ratio interchangable??

[Dugi]

i've read that the final gear of a 240SX is 4.08. wanted to know if i can change it with any other car for a lower final gear. 300ZX is about 3.69 right?? is there anything in between 4.08 and 3.69?? 3.69 would be too low.

thanks guys

[AZhitman]

Actually, when discussing rearend ratios, a higher numerical value equals a lower final drive.

A Q45 (g50) HAS A 3.54 RATIO, A j30 HAS A 3.96, AND AN OPEN DIFF ON A 240SX IS 4.08. 300ZX n/a is 4.08, twin turbo is 3.69. (oops sorry caps)

There's a negligible amount of difference between a 3.96 and 4.08 (not noticeable).

What do you want to achieve? That'll help us help you.

[Black R]

Is there a numerically higher ratio final drive that isn't too much $?

I think a 4.4 or 4.7 would be kind of fun.....

[cnichols]

Available Ratios that can be used and easily found...(there are more out there, but these are proven and can be swapped in w/out too much hassle)

4.63 ---> Nissan Motorsport Ring and Pinion set4.36 ---> Certain 180SXs in Japan & Nissan Motorsports4.08 ---> USDM 240SXs & 300ZXs (N/A only)3.92 ---> 92-96 Infiniti J30s (92-94 had 5 bolt axles, 95-96 had 6)3.69 ---> S15 and certain overseas Manual S14s as well as 97-01 Q45s3.54 ---> 90-94 Q45s (requires a Driver side Q45 axle for the passenger side and a Driver side Z32 TT axle for the Drivers side)

NOTE: The 300ZX Twin Turbo pumpkin (R230V) cannot be used in an S chassis due to it's size.

[Dugi]

well I need more top speed. on the 1/4 mile i'm hitting about 7k rpm in my 4th gear. I've got about 500+rpm left before shift but, i will be upgrading to a bigger turbo so I was wondering how much rpm is left without shifting to 5th gear. shifting to 5th would be overkill just for a bit

[Black R]

4.63 ---> Nissan Motorsport Ring and Pinion set.

Is this part expensive? And can it handle xxx power?

[ser2102]

if you get the shorter gear... say 4.6~ then you would have to shift into 5th. the higher the number, the faster your rpms will run out.

[naed240sx]

Is this part expensive? And can it handle xxx power?

If installed properly it will be able to handle the same amount of torque as the stock ring and pinion set.

[cnichols]

Is this part expensive? And can it handle xxx power?

They are pricey. 4.36 can be found fairly cheap.

Remember: Tire size effectively changes gear ratio!! This is another way to adjust your overall ratio if you only need it at the track.

*Also, the higher the numerical gear ratio, the smaller the pinion becomes, thus reducing its strength.

[Black R]

noice. since it's a nismo part, i'm assuming i can order it from my buddy at nissan?

or is it a jdm market part that has to be imported. (if you have a link, please lmk! )

[cnichols]

I'm thinking it's more a Nissan Motorsports USA part, but I'm not sure. Courtesy Nissan sells them I believe.

The 4.36s can be found already in a pumpkin on Ebay, etc.