Ok, well I have posted about this before (fair few months ago) but the problem is still there after I have tried a few things.

Points to note:

Car is making 245hp at the rear wheels
I have a 2 way LSD (locker)
I have Tein Coilovers, which are very firm
My tyres are top of the line goodyear tyres (eagle f1 gsd3)

Initial problem. Got a new clutch (coushined ceramic ) put in along with the diff oil changed, picked it up and there is a knocking coming from the rear, upon closer inspection have snapped the front diff mount.

Alright so i brought and replaced this myself and it feels like the car is axle tramping bad, like really bad on hard launches and hard gear changes, took it to the mechanic they said that the rear diff mounts were busted

Saved up some cash and got them to do this as I don't have the gear also had all the suspension bushes inspected for damage and they were fine.

Once this is done, axle tramping feeling is still there, started to get a lil worse the other day so i took it back to the mech, the put it on a hoist and i have shattered the front diff mounts mount.

So the mechanic has informed me that this can be a common problem with them, and are going to make a new bracket and strengthen it up quite a bit. I asked about the axle tramp and he said its normally an issue with the car, says everything is fine under there but i'm not entirely convinced as with the old clutch i never had this problem. It makes a very violent axle tramping feeling, u can feel it coming through the car and its loud inside. The thing that gets me is it makes this noise when it spins up in the wet. Does anyone have any ideas what this prob is, its killing me. I wanted to enter in the hill climb at the end of the month but budget is not allowing me at the moment >_<

 

hmm you could try gettin stiffer spring rates and bushings..

 

Well my back end is rather stiff as it is, I have an electronic damping controller for the suspension, have tried it on full hard and full soft and the problem is the same

 

when did you install your LSD?

 

who installed your lsd. sounds like you have a bad backlash adjustment. might want to have that check. may be to loose which can cause that shuddering that your having.

 

I had the same problem, replace all my bush and no difference then someone told me try running a softer spring as its probably to hard for the shock so i went from a 6kg spring to a 4kg and turn the damper up and the problem was gone. But i have heard its not always the same fix it vary's on cars.

 

Well the LSD was installed before i got the car, and it was done in japan, the car never had this problem before i got the new clutch installed