Help needed

[ginge]

Hi I have a old yokomo mr4tc speical
It is my first time building a chassis
I built the 4 shocks all the same and when I fitted them to the car the front sits about 2-3mm of the ground and I have it screwed down half way

Tho the back is ok, it is sitting about 5-6mm

Should I be using longer shafts in the front shocks
I can't see what I have did wrong