60mm Diff Drop - Longer Steering Shaft???

Hi Guys, i am developing a 4.5" for my TR4 2006. I did a 60mm diff drop and the steering is not as smooth as it was before. I notice that the shaft that comes from the interior of the car was pulled out form its original position around 30mm, is that fine?? I thought i could correct it making a longer steering shaft (the one that links the steering box with the column, will put a photo in this post) is that a good solution, having in mind that the internal shaft came out 30mm, how longer should i make the steering rod.