rear gears

[rioredstang]

Ok all you nissan guys. I have been told that C200 gear will fit in my 240sx. Is this true or am I just trying to be sold something that won't work. Please help.

[projectRDM]

R200 only.

[rioredstang]

Well that's what I am trying to do. I don't understand what you are telling me. Is a r200 and c200 from a pick up the same ring & pinion? Will the interchange with my LSD? Please help.

[projectRDM]

Originally Posted by rioredstang

Well that's what I am trying to do. I don't understand what you are telling me. Is a r200 and c200 from a pick up the same ring & pinion? Will the interchange with my LSD? Please help.

R200 is the rear unit used on most RWD Nissan models. I'm assuming the C200 is a front unit? Even if it's not, the difference in part numbers leads me to believe they wouldn't interchange, at least not without the matching differential or the case as well.

[g6civcx]

C200 is the front diff available on Pathfinder and perhaps other Nissan models.

Think about it for a second.

If you insist on using certain parts from the C200, at least get the parts blowup and compare. Ideally you can see one in person. Look at how the propeller shaft mates up. Then tell me if you still want to use the whole diff.

Originally Posted by rioredstang

Well that's what I am trying to do. I don't understand what you are telling me. Is a r200 and c200 from a pick up the same ring & pinion? Will the interchange with my LSD? Please help.

This question cannot be answered without knowing what you have now. You want to put the C200 ring and pinion into what car? What diff do you have now? How much work are you willing to do to make a frankeinstein diff?


FYI, I have 3.0133 and 2-way in an R200. What ratio do you want?

I'm not trying to mess with you. I know you said R200 but R200 comes in many different flavours: short vs. long nose? s13/14 or s15 or something else? 12 or 13mm ring gear bolt? output shafts and flanges and axles?


Tell me exactly what you want to do and I'll help you.

[rioredstang]

I am looking at ring & pinions only. C200 comes in the rear of some pick ups. I have helical LSD. I want to have several sets of gears for my 93 240. I road race only so different tracks take different ratios.

[g6civcx]

Originally Posted by rioredstang

I am looking at ring & pinions only. C200 comes in the rear of some pick ups.

I would be very surprised if someone can help you with C200 R&P swaps into R200 housing. I personally do not know of anyone who is well versed on this topic. Even truck guys don't know from what I've seen.

Originally Posted by rioredstang

I have helical LSD. I want to have several sets of gears for my 93 240.

What diff housing do you have? Stock for the 93? If so it's a short nose diff housing. You won't be able to swap in some of the lower r&p. They're just too big.

Does your diff use 12 or 13mm ring bolts? Some rings use 12mm, like the stock 4.083, while most others use 13mm. You'll have to bore out your lsd to accept 13mm, and if you want to go back to 12mm you'll have to use adaptor spacers or retap your stock ring gear to 13mm.

Originally Posted by rioredstang

I road race only so different tracks take different ratios

Are you good with rebuilding diffs? It takes a long time to swap out r&p. You basically have to do a complete teardown to get to the r&p.

It may be faster to prepare a bunch of diff housings and then swap out the housing as a whole.


The best I can do to help you is tell you that you can go to 3.9 to about 3.5 relatively easily with R200 r&p. The next jump is 3.0133. If you want to go up you can go to 4.4 or even 4.6.

Anything else will require more research.


Good luck.

[devnull]

Originally Posted by g6civcx

It may be faster to prepare a bunch of diff housings and then swap out the housing as a whole.

I think he's intent on using an HLSD, but I get the feeling he doesn't have the small fortune needed to buy enough to equip multiple diffs.

If he wants to work hard enough to swap out the ring gear every time he needs a different one then I say more power to him.

[g6civcx]

Originally Posted by devnull

I think he's intent on using an HLSD, but I get the feeling he doesn't have the small fortune needed to buy enough to equip multiple diffs.

If he wants to work hard enough to swap out the ring gear every time he needs a different one then I say more power to him.

I hear you. Here's the problem. Most junkyards won't sell you the r&p separately; they make you buy the entire diff housing.

Since you already have the diff housing, it may be easier to just leave the pinion in the diff. If you only have one HLSD, then it will be easier to have a bunch of diff housings sitting around.

Then when you want to swap gear, you take your HLSD and you bolt it to the appropriate ring gear, bolt the rest of the stuff to the specific housing with the pinion gear already installed.

It will save you a lot of time. Plus if you remove the pinion too many times from a single diff housing you will start chewing up the bearings.

[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.