...If you meant to say "steering sector", then you might be able to remove the steering box cover plate and the pitman arm and slip the sector out of the box. However, I have not checked to see if there is enough room. Even if it is possible, you will have a difficult time adjusting it after you replace it. Adjustment is easier on the work bench.
Don Turley
www.donturley.com
thank you all . i meant the whole box , not just the sector . i figured it all had to come out but had to ask . thank you again .................... steve