rear gears

[g6civcx]

Plus if you're serious about your gears you can go with an aftermarket rear end that will give you infinite gearsets.

[rioredstang]

I have all the tools at my shop. I own a auto repair shop so building the diff. is not a problem. I intend on having several diffs set up so at the track we can quickly make changes during practice sessions. I have a 4.08 and 4.36 set up on HLSD's now. I don't know if short or long or what size bolts but I will find out. What are the spec for short vs long? I would like to have a 4.6 and 4.9 also. I have not ran this car yet so I don't know the torque and rpm curves. This is why a need the gears to be able to match transmission ratios and final drive ratios to best suit corner speeds to each track. I would spend a lot of money to buy everything new so if I can find used parts that will work helps a lot.
I appreciate all the help, I value everyone's opinion very much. Forum's such as this are very helpful to newbie's like me. I have spent a lot of time with high horsepower V8's so the tuner cars are new to me.

[g6civcx]

Originally Posted by rioredstang

I have all the tools at my shop. I own a auto repair shop so building the diff. is not a problem. I intend on having several diffs set up so at the track we can quickly make changes during practice sessions. I have a 4.08 and 4.36 set up on HLSD's now. I don't know if short or long or what size bolts but I will find out.

The stock is a shortnose. 4.4 and 4.6 will fit in the shortnose housing as well.

You can tell by looking at the mounting ears if it's short or long nose. I have both here so I can take some pix for you if you'd like. It will be obvious when you see a longnose and compare to your stock shortnose.

Some of the lower ratios won't physically fit in the shortnose because the pinion is too big.

Stock is 12mm. If your 4.4 ring gear bolts to the hlsd with no mod then the 4.4 ring has 12mm as well.

It will be clear when you see a 13mm ring gear. Some of the lower gear sets use the 13mm.

Originally Posted by rioredstang

What are the spec for short vs long?

No difference other than the fact that the longnose pinion is too big for the shortnose. I don't know why Nissan didn't make all R200 long nose, but that's how it is.

Originally Posted by rioredstang

I would like to have a 4.6 and 4.9 also.

You can get these in the truck diffs. I don't go up so I don't have experience with this. I would guess that they're mostly longnose unless you can find the Nismo 4.6 gearset, which I have only seen once in my life on a pro drift car.

Originally Posted by rioredstang

I have not ran this car yet so I don't know the torque and rpm curves.

Start with a dyno plot. Then I can help you plot torque at the wheels for each gear. That will give you a general idea before you start testing.

Originally Posted by rioredstang

This is why a need the gears to be able to match transmission ratios and final drive ratios to best suit corner speeds to each track.

I agree. I haven't seen too many people here who play with gear ratios and final drive ratios. If they're here they haven't spoken up too much. I'll do what I can to help you.

Originally Posted by rioredstang

I would spend a lot of money to buy everything new so if I can find used parts that will work helps a lot.

I hear you. Some of the stuff I don't think you can even get new.

If you have the expertise and resources, it would be nice to post up everything you can stuff into a shortnose and longnose diff to help people.

Originally Posted by rioredstang

I have spent a lot of time with high horsepower V8's

Preaching to the choir, boss. Daily driving my chevy small block S-chassis for 2+ years now.