Or a Preston dog-ring w/ 3.321-2.138-1.346-1.135-1.003

Pick from the other 15 gear sets (2.430 to 1.140) or buy what fits your needs.

Of course there's the money involved in getting one.

But rxsleeper made a great point about the diff and fitting it to the course and the car. While most of the folks who just posted know this, it will be a "new" fact for someone else to discover.

Chicago 240Z...it is awesome to see that there are still new "converts" to the vintage racing scene with excitement and enthusiasm regarding Datsuns and racing the 240Z!! Congrats and welcome

I can feel your excitement for buying parts and putting your car together. You are where I was 15 years ago when I started with my 240Z vintage race car. Looking back, I would say one important lesson I learned (that echos what DatsunDoc was alluding to) is to put your car together in stages with parts that work well with each other. A race car is a conglomeration of parts that must all come together properly. You can have a close ratio direct drive tranny but if the motor is not a full out race motor that is designed and built to be consistently run and the top end of the rpm band you are waisting your money. With that said, a fullout race motor is also very finicky and requires quite a bit of attention which isn't the way to go for someone trying to set-up or shake down a new car either.

Put a yearly budget together that includes a ton of seat time at both vintage race weekends and track days so you can be fully comfortable with your car. Don't feel like you need every full-on competition part right away, just make sure that the car is reliable first so you can make the most out of the track time you have....just my two cents....BTW, if you want to talk sometime PM me and I would be happy to help in any way:)

To everyone....in regards to the hens teeth everyone was discussing or otherwise known as gears and parts for the direct drive trannies, this may be a shameless plug but I am in the process of making available brand new gearsets for the direct drive trannies!! I am also remaking several other race parts for the L series motors and the vintage racing Z/510/610. One that we currently have available are the Quaiffe LSD's for both the R180 and R200. I too feel that there is really no need to go to the R200 except if you want useless added weight. Especially since Quaiffe backs their LSD's with LIFETIME warranties! Yes, something totally unheard of in racing parts.

Anyway, if interested or you want more info on any of the parts PM or email me....

One that we currently have available are the Quaiffe LSD's for both the R180 and R200.

Last I heard, Quaife quit building for the R180?

I use a C type sx180 box , We did the modification to a 240Z bellhouse and fitted a Kamiari close ratio kit 2.62-1.81-1.36-1.00-0.83

And using a R180 GrN Prodrive 4.40 diff with my own output flanges