Don't know if this is the sub-forum where this question belongs but here I go..

What are the 3-links and 4-links ?
What is there purpose ?
What are they used for when modifying ?
Which is better ?

Thanks and regards,
Albert.

 

http://lmgtfy.com/?q=difference+betw...ink+suspension

 

Thanks

 

There are many, many threads covering all the questions you asked. Hop on the google machine and go for a spin.