[diehard_dude]

I have a 99 suburban that has a steering problem i cannot seem to solve so i'm asking here for input.
When turning right there are times that the steering wheel 'drops' as you turn, almost like a soft spot in the steering. It does not always do it on every turn. It is a real treat when pulling the boat, it forces you to really pay close attention so you stay in your lane. The problem happens with or without a trailer attached. It is most noticable when braking but it occurs without the brake as well.

Thus far we have changed the idler arm, the pitman arm, the drivers side ball joint and the problem is still there.
Everything else underneath appears to be in good condition a solid. A boot on one of the tie rods is ruptured but otherwise it all looks good and feels solid with the car raised on jackstands.
Since it is getting expensive to keep going with the shop's 'hunches' i need some input on what i should try or a direction to look.

Any input would be appreciated greatly.