hi there!
got my ball joints changed on my 2wd saff during the week and was wondering if this would have effected any of the geometry of the car? as it seems to understeer more now...maybe just my imagination?
any thoughts guys?

 

It would be wise to have a re-alignment check done soon after fitting yes

 

If you mean the track rod ends then yes it will need an alignment check. most people tend to count the number of turns to undo the old ones and put the new ones on using the same number of turns but its hardly a perfect method. get it checked anyway.