Probably some where, buts its a very bad idea unless you do some very good engineering`. The problem is where the rack hooks to the steering shaft. The stub shaft on the rack is not made to take a lot of movement and since the rack is bolted to the axle and the column is fixed to the cab, there is a lot of movement between the two. You have to come up with a way for the end of the column to pivot and twist while staying connected to the rack when the suspension moves. You will have in and out plus up and down movement all while still having twisting turning movement.
If you bolt the rack to the frame, you still have a lot of movement on the tie-rod ends, way more then designed for since the truck is much bigger and heavier then most racks are designed for.
Joe
