Steering Column Through Firewall

[truckster]

Still working on cleaning up the engine compartment before I put my Vortec motor in. I received some parts today (don't you love seeing the UPS truck), including the steering column firewall seal. The air blowing through there in the wintertime gets really cold.

Here's my question: How much of the steering column needs to come apart to install the new seal? I'm going to be pulling the PS gearbox anyway, so I think I just need to remove the column shifter (auto trans). Does that sound right? Anything else I should know?

Thanks.