Hey guys,

I did search, and couldn't find an answer so I thought I'd post. I have a 200sx notchback with a CA18DET swapped in. I've had some fun with this car burning out and doing donuts, however, the rear end got messed up and now it only rolls like 20ft before locking up and then you can only roll it back 20ft. I want to repair it with something better than stock parts. What can I put into it to let me do my burnouts worry free? Are there compatible rear ends that are tougher from other Nissans?

Thanks

ahh sure it might not be the tranny never seen a prob like this

You have a notchback so stock you have an r180. They are not known to break very often but are the weaker of the two differentials offered in the s12. The other is the r200 and they are known for being damn near indestructible. The r200 was offered in the ca18et and vg30e s12's as well as a wide array of other Nissans. If you do want to upgrade to something besides replacing your stock r180 (which would probably more than fine, especially considering the ca18det doesn't produce a lot of torque generally) the r200 is definetly not going to break. You can acquire one from a ca18et or vg30e s12. As far as I know the r180 and r200 s12 diff's swap right in and out although you might wanna double check this before taking my word.

I would still have to agree with Bart and suspect a bad tranny before a bad r180. It would suck to replace your diff and the car still doesn't move.

lol so how strong is my crappy h190

Oh yeah. I forgot about the 84 SRA. Don't know much about the h190 but I have heard they are comparable in strength with the r180. Maybe a little stronger or weaker but in that general area.

The H190 is very strong. My welded one lasted two cars and nearly 250,000klms.

I'm building another one with a mechanical 1.5-way, and running 235/45/17 semi-slicks. I don't think I'll have a problem.

If you can move 20 feet that doesn't sound like a rear end problem.

r200=bulletproof

The r200(4pinion) is strong enough for most of the power outputs of the members on here. Honestly, the r230 is the indestructible differential. The reason the R180 is only deemed weak is because it's 2-pinion in the S12. A 4-pinion R180 is comparable to the r200.

Edit: Forgot to mention that differentials are rated for torque, not HP. Also, drivetrain shock also can damage/destroy a diff, even with low amounts of power.

IF you can kill an R200, you're doing something.

K maybe it is the transmission, I only assumed it was the rear end. I wrecked it by doing to many burnouts and donuts by reving it up and then letting the clutch out all the way.

I wanna be able to do burnouts all I want without this happening again.

well the r200 is strong but still has weakness since its a open leg... the r200lsd is the king o r200's. this is what bend used in stock form to run his 9's...

R200 CLSD FTW! They are amazing. Still looking for one for my 85T Z31.

Everything you need to know right here, Well at least a lot of it lol.

http://forums.hybridz.org/showthread.php?t=114798

or you can weld a r200 and never look at it again

if your going to be the burn out king your clutch will go next so if your doing the trans might as well upgrade
other things will fail if you continue to do burnouts all the time

hmm, i dunno about that, depends on your power.... with my other s12, my ca20e one, i drifted 10 events, and around 2 of those events i was doing standing burnouts all day, i used 4 sets of rims i brought both times... still on stock clutch from 1986 and works good

Besides welded diffs, nothing is as strong as a torsen-type design (so long as it's a good brand like a Quaiffe). No clutch type and certainly no viscous type will ever be as strong.

damnn thats lasted a while! i think its just nicer to toss in a new clutch and flywheel while the trans is off so you dont have to pull it off again.

Yeah I run an s15 helical lsd and it works great. I have heard of guys blowing them from insane amounts of horsepower sometimes on the drag launches but other than that it seems extremely rare that a quality torsen breaks or fails.

how hard is it to put the s15 diff in? was it alot of work?

I guess I should have specified this was in my s13. The s15 helical, as far as I know, won't work without custom work in an s12 because of the s12's half shaft design. The s15 diff is designed with the 30 spline output shafts compared to the s12 output shafts having 29 splines (someone correct me if I am wrong but as far as I know the r200 in the s12 is a 29 spline design). Because you can't unbolt the output shafts from the half shafts in the s12 this is a no go. Other alternatives I have researched for s12 bolt in helicals are the OBX helical or Nissan OEM 29 spline helical lsds offered in a few select other Nissans. In theory these diffs should fit the s12 29 spline output shafts since the OBX helical is designed for the s13 open diff which has 29 splines as well. There were also apparently a few 29 spline oem Nissan helical lsd's offered but I would imagine they would be fairly harder to find. I know OBX has a reputation for making junk parts but I have actually heard good things about their helical lsds so long as you go through them after you get them and re tighten all the internals. Apparently they do a horrible job at tightening the internals from the factory which is what causes a lot of them to eventually fail. I am not 100% sure every bit of info here is correct but overall it should be fairly accurate. I still haven't heard of anyone actually trying to install either one of these 2 diffs into their s12 so for now this is all in theory that it will basically just bolt in.

+200

What brand are you running with? In the S13 I mean.

Just the stock OEM s15 helical.

wrap the differential in kevlar. Bulletproof rear end.

Kevlar.......of course. Excellent plan.

But what about armor piercing rounds? Maybe I should attatch some ceramic plates to the kevlar..........just to be safe.

Keep it on topic guys.

Basically for the $$$, if you don't care about handling in terms of grip, and want to just bust ass or drift, the welded diff is the best bang for buck, and leaves you with a pretty solid piece inside.

I know this thread is really old, but I'm back on it. I let the car sit for a year, now I'm getting it fixed up. It turns out that it is the differential and not the clutch. The R180 got all busted up from my rev up, clutch dropping burnouts. I'm going to try and upgrade it to an R200, I have an opportunity to buy an R200 from a 1992 240sx, so naturally my question is:

Will the R200 from the 92 240sx fit in my 1987 200sx?

Thanks for the help as always guys.

Nope that is a short nose r200. You need one from another 200sx or from a 84-89 300zx which is long nose.

That confirms my suspicions. So I need a longnose one eh? If I manage to track one of these down, is it a basic bolt up operation? I read somewhere that everything is gravy, but you need a custom flange for the driveshaft. Is there anymore to it than that?

Thanks

just swap the internals out.