Hi all, due to rattling and squeaking suspension I'm thinking of upgrading.I have a 156 2.4 jtd 20v sw so as the gta suspension is compatible would this be a worth while upgrade? I was thinking gta shocks and roll bars with new eibach springs and polybushes. I'm sure the roll bars would be an improvement but would I see an improvement from gta shocks?
I can save you an ocean of pain here, having endured years of trying to get this right. First up you want GTA front springs and GT 3.2 rear springs. Reason being is that the non GTA SW came with 2 suspension types, a standard, high set up, and a sportpack set up, which I suspect yours came with. This had a nivomat rear shock, self leveling unit, which did the work of shock and spring in one unit. It had a spring but it was merely there for cosmetic reasons, it did no work. The nivomat was set to a ride height that matched the front sportpack spring. The SW was based on the same floor pan as the GT, meaning its front platform was the same as the saloon but the rear was specific to SW/GT. Different to the saloon in other words. This has a difference in the top mounting/inner arch panel of the shock/spring area. As a result the only spring known to man that will give a correct ride height is the GT 3.2 rear. To further complicate matters, the GTA rear shock has a different spring mount on the body of the shock. So a rear GTA spring will only sit right on your SW if paired with the original GTA shock. That restricts you to a choice of only one shock, which wasn't a great shock to begin with. So to summarise, the above spring combination will give you the correct ride height and allow you to fit your choice of shock and provide a really good ride/handling compromise. You will have to fit second hand springs though, as I'm not sure new are available, and if they are, they will surely be pricey. Nothing wrong with second hand, they are very robust. Mine are second hand.
I have had Eibach pro kit springs, 30mm lower than standard, and found the rear too low and the front too soft. Now on GTA front springs and GT 3.2 rear springs its perfect. The factory springs were always brilliant on these cars, it was the shocks that were cheap and nasty. I have monroe reflex dampers which are impossible to buy now and are fantastic. But I would recommend Koni FSD's or Koni sports which are adjustable.
The other option is adjustable coilovers for which a good set such as KW's will do everything you want but at a price.
Regarding Anti roll bars, all you need is a GTA rear bar, saloon or SW, second hand again, lick of paint and its all you need. That was the single most effective upgrade I have fitted to mine, in 275,000 miles. An absolute must have. Your original front is fine being already beefed up for the 2.4 lump. Polybushing, avoid. Stick to good quality new wishbones/rear arms, such as TRW. Polybushing creates noise, vibration and hard ride issues.
Believe me, I have learnt the hard and expensive way, these are the only solutions for a SW.