Hi I have a 2010 skoda scout tdi estate 

I have just replaced both rear bottom suspension arms the ones that hold the spring in place springs are about 6 moths old 

I also replace the 2 special bolts and nuts and washers 

Now when I get bit speed say 40mph its like the back end is going to fish tail out on me very swayey when I hit a bump jesus it looses its self and some corners I have gone around the back wheels have lost traction on tbe Road what am I missing or what is the issue 

1 hour ago, Lorrigirl29 said:

I have just replaced both rear bottom suspension arms

What have you missed? Well, there's no mention of setting up the geometry after replacing the arms.

Sorry I don't know that I thought it was a straight swop part 

Can you help me a little more please thansk 

Broken anti-roll bar or drop link (front or rear)

12 minutes ago, Lorrigirl29 said:

Sorry I don't know that I thought it was a straight swop part 

Can you help me a little more please thansk 

After you change an adjustable component in the suspension, you need to check the suspension geometry. This is a specialist job to get right. Look for a garage or fast fit place near you that has a Hunter rig.

6 hours ago, Me-109 said:

Broken anti-roll bar or drop link (front or rear)

Rear

6 hours ago, KenONeill said:

After you change an adjustable component in the suspension, you need to check the suspension geometry. This is a specialist job to get right. Look for a garage or fast fit place near you that has a Hunter rig.

It is a solid unit thats wy I thought it would be ok for a straight swop cheers 

Are the two "special bolts , nuts and washers " you replaced the adjustable ones. If so then thats your problem as KenONeill says. 

There will be differences between the old/new suspension arms and the new bushings will also cause them to move.

 

It's very unlikely you've managed to get the inner adjustment bolts in the same place either, all of which will cause the alignment to change. Assuming it was even correct to begin with... 

 

 

Plenty of garages will do a free alignment check so I agree with the above and would start there. If anything is obviously wrong, badly fitted or broken, they should be able to tell you.

 

The two inboard bolts are eccentric and will need alignment