Mega clunking from rear- 2 way diff??

[neil_se]

I've just got my silvia on the road today and am making sure nothings wrong before i really start to drive it.

I know the hallmarks of a 1.5/2 way diff are noise going round corners at low speed but i've got very pronounced noise and clunking around corners and going straight at low speeds. Its most noticeable rolling at low speeds then engaging/disengaging the clutch with a little bit of throttle. The clunk is enough to be felt throughout the car and my seat. I would expect the car to have a mech diff as its fully set up for drift.

Fully stripped interior/boot and drift suspension setup are obviously going to increase the noise and vibration, but is this level of 'clunking' normal?

Diff pictured below (non-standard rear cover?).

[Eug]

i have a clunking sound too... its a very light and not too deep.

similar conditions to yours, mine can only be heard during slow turns or slowly applything the

throttle.

BUT - i think i have a standard LSD, i have spoken to my mates and they have heard it too..

they reckon its NOT the diff, and more possibly the exhaust (stock) which may have worked

itself loose or something.

I notice no difference in how the car handles however... does this sound like your problem?

i'd be interested to hear what others think?

[Bazelinez]

I had a 2 way in my silvia and only on cornering did it make noises, hell noises too. You could also feel the car shift sideways on itself after correcting. Not sliding either, normal driving.

I would think there is some problem with the tailshaft/diff connection if its clunking under on off throttle.

[neil_se]

Mine is a deep 'mechanical' sound. The exhaust is attached very firmly, there is slight grinding noise due to working the surface rust off my brake rotors, and the boot rattles round a bit, but this can clearly be heard over the top.

[Bazelinez]

No idea, obviously there's oil in the diff? he he... Different brands are different too. I've seen and felt 2 way diffs that didn't make any noises and ones like mine that sound like they're gonna snap.

[neil_se]

You could also feel the car shift sideways on itself after correcting. Not sliding either, normal driving.

Yeah, that's what it feels like.

My old standard diff in the 180 made clunking noises on/off the clutch at low speeds too due to the button clutch sending shock through the tailshaft.

[neil_se]

My replies are getting all out of kilter

I think i need to take someone who's had 2-ways before for a drive and see if they can relate.

[Bazelinez]

Yeah, that's what it feels like.  

My old standard diff in the 180 made clunking noises on/off the clutch at low speeds too due to the button clutch sending shock through the tailshaft.

that's normal then! Its all good Price you pay for sideways on demand.....

All rear drive cars have some degree of driveline slack, what you mentioned is just the normal behaviour of hardcore 2 way... amplified by the stripping you've done.

Don't forget you almost sit over the diff in an S13 if your fairly tall...

[dangerous_daveo]

Id try chaning the oil, it helped quiet down mine a little on the highway. But then mine was also really really thick black stuff when we drained it. So yours could be the same.

[raz0r$harP.UK]

My brother's car is the same, shuddering and noises is pretty bad during low speed cornering. Was recommended to do a rebuild of the diff, with new clutch plates and all. About $600 for our 1.5 way.

[R31Nismoid]

mine used to clunk a lot all the time.

turned out the diff mount was really busted up allowing things to move and make noise.

Might be worth a look?

[neil_se]

I might get a diff shop to change the oil and do an inspection.

[drifto]

I has my Kaaz two way rebuilt by this knob in Fyshwick and he put it back togeather wrong with incorrect clearances and preloads etc.

The result felt like someone was swinging a sledge hammer under my car when i turned even the slightests corner witth anything less than heavy throttle.

Even coasting into a corner in 4th or 5th would get it going.

The car dramatically changed direction between on and off throttle two.

Since having it rebulit by a decent engineer, it is perfectly smooth when driving around town under normal throttle.

If you try and do a hill start and turn at the same time it will carry on a bit until the clutch is fully out. Then it just locks up nicely and skips the inside wheel a bit.

Running a decent synthetic oil can help but over time they can loose the correct preload settings and clearances due to normal wear and tear so yours could be half way to were mine was.

[Bl4cK32]

My Nismo GT Pro 2 way is very clunky at low speeds ie 5kms or less. Its currently set to the softest setting, and yes its damn clunky when the clutch is out. You either have to get used to it, or get rid of it.

I put fresh redline oil in my diff when i got it (it was just run in when i put it in my car.) It has about 5000 kms on it, and its always clunky, but damn good for corner speed (hooks up way better than std), and locking the rears if i need it (take off, and compression lockups)

[Duncan]

Sorry, but AFAIK your diff should not be making any noise when heading straight.

Certainly a locked or tight diff will clunk and carry on when you are turning, this is because the outside wheel is trying to turn faster than the inside wheel, so the inside wheel skips so it turns at the same speed.

You might have stuff worn out elsewhere in your drivetrain, driveshaft, cv joints, rear axles etc etc or the diff centre may not have been aligned properly....if not get it fixed as it will be much weaker since the gears will not be engaging properly

[confuzion]

Yeh when going straight no clunking should happen..

Mine did last week (stock gtr diff) and it got worse so we pulled it out and some bearing failed and has caused the crown and pinion to loose teeth and stuff..

Not good!

[Bl4cK32]

lol...sorry. Mine only does the clunking when turning at low speeds. Not in a straight line.

[FATGTS-R]

I would get the driveline looked at as Duncan mentioned.

The AUS R31 skyline is famous for clunking and carrying on just as you have described. And it definately does not have a mech LSD.

I have one as a daily driver and get the same thing. Pull into the driveway at low speed, dip the clutch and then "PHWOOMP". Drifto described it well as feeling like a sledge hammer was swung under the car.