I have heard nothing but good things about redhead. If i ever need one it will be from redhead. Here is an idea of cost from when i was looking into one. This is from harvey at redhead. Hope this helps.
"If you buy a remanufactured steering gear from us the cost is $466 exchange plus a $250 core charge until we get it back. If you send us your gear box and we rebuild YOUR unit, the cost is $276 and there would be no core because we are building yours.
We can rebuild yours in 24 hours time and we can do this as long as the guts of your gearbox are not broken up. These steering gears almost always have tolerance issues between the worm and piston assembly, which are the very "guts" of the gearbox. But we eliminate this problem with custom fitting oversize, recirculating, chrome, steele balls- of which we have 5 different sizes, which we keep stepping up until we eliminate any lash between these components."