Marv

When you are using the engine as a brake, yes, but how often do you use a $25K transaxle as a brake on public roads?

Still need clarification on what is happening when the car gets squirrelly. Is it during hard acceleration at high speed? Is it hard braking at high speed? Straight or turning? Is it simply cruising at 180 kph that the car feels unsettled?

black04

When one brakes in a turn, a bad LSD can cause instability.
Furthermore, the clunk I was referring to was the OP's, not yours

Oh and a broken spider gear will cause the rear end to jump sideways, similar to what the OP stated.

rbahr

Also the LSD can affect braking in a straight line. That said, Johan any new news? My suggestion at this point:

• Check the front shocks - remove them, pull the springs, look for leaks, see how they compress.
• Check tie rods, steering rack, and ball joints.
• Make sure your tires are good
• Do a nut & bolt in the front
• Check the rear LSD: Jack the rear, car in neutral, have someone prevent one side from turning, Get a torque wrench on the other side, and see where that side breaks away - more details somewhere

Ray

tom03

in addition
You could also check the shocks in the car (ADAC in Germany is able test this)
The rear tires must be the "same". If they are different (age) the car is not driving straight beyond 120 km/h. I had this with some Pirelli tires

@Ray: Any more details on the LSD check method ?

Thomas

Nickshu

Many of the original GT3 coilovers I have seen are leaking. Especially the rears. They are all old now.

Johannvb

Thanks for all the advice guys. I am currently under lock down in my home. As soon as we are allowed to go out again I will take the GT3 to my technician for some diagnostics. At least I now have a list of possible causes to investigate.

- toe links rear
- all bushings
- shocks
- sway bar (pre tension)
- LSD ; I will flush the gearboxoil to be safe

rbahr

I am locked down in Honduras...

Anyway: I would also suggest:

• Check tie rods, steering rack, and ball joints.
• Make sure your tires are good
• Do a nut & bolt in the front
• Check the rear LSD: Jack the rear, car in neutral, have someone prevent one side from turning, Get a torque wrench on the other side, and see where that side breaks away - more details somewhere

Ray

Marv

Hope everyone stays safe. Good luck!

rbahr

Thanks!

black04

. I wish it was that easy to test an LSD. Worn plates can temporarily INCREASE torque
. Some posters have stated a worn LSD's symptoms are twitchy handling braking or accelerating in a turn. Those were my symptoms. The worn LSD would have to slip-lock-slip-lock in a fraction of a second to degrading handling in that manner.
i.e. a worn or damaged LSD doesn't necessarily become the same as an open differential and have no effect on handling, the bad LSD could actually degrade handling

Further evidence of unusual or unexpected bad LSD symptoms...one poster here states that his LSD is long worn out and does not affect handling...Maybe his is worn such that it does act as an open diff

saxen

Can anyone give any input on when the shocks typically fail or need to be replaced?
IE do most fail around 25K miles or 16 years
or 50K miles or 16 years
75K miles?

thanks

rbahr

This is not to be a thorough test of the assembly, but rather will provide some small amount of information. I am aware that to properly evaluate the LSD, it would be removed.

Xiaoming hoho

DUDE...I literarally did the same thing as you did.
Just got my 997 4S yesterday and spinned out today on highway, hitting a puddle in heavy rain.
Luckily I didn't hit anything other than scuffing my right front wheel. Hopefully the car is fine.

I ordered the Ohlins R/T coilovers for my car since the rear right absorber has gone bad. (car is 2008, 104k miles) I heard that OEM Bilstein absorbers tend to leak at around this mileage/age.
I wonder if something is losened in the steering system of your car?

JJT

Can you put more information?

Thanks

Marv

Elephant Racing makes a set of thrust bearings: https://www.elephantracing.com/911/c...t-bearing-kit/

However, the open roller bearing can't last long once dirt gets in there.

This link is not the one I remember, but looks similar. Instead of a roller bearing it uses what looks like Delrin (a slippery version of nylon) sandwiched between stainless steel washers. Dirt is less likely to degrade these, in my opinion.

https://www.splparts.com/products/sw...t-washers.html