Karl - This spring I was doing major re-work on the front suspension and steering box in my 1958 TR3A and had the whole steering box and one-piece column out the car. I then used a puller to pull off the pitman arm that is secured with a huge nut to the lower splined output shaft which comes out the bottom of the steering box. I used the puller which "belongs" to the members of this forum. Others who have used it are Dick LeClair in Tenn., Moseso in Wisconsin, who sent it to me and it's now with Adrio in Ottawa.
If you feel you need to use this puller, let us know. But it can't be used with the steering box still in the TR.
Then I continued to remove all the suspension parts before re-installing the steering box and column.
After I put the steering box back in, I continued to re-assemble the wishbones on both sides of my TR. The one closest to the steering box was a devil, but I didn't want to pull the steering box and column out again. All I had to do was to remove the huge nut which secures the pitman arm onto the lower output splined shaft to get enough space to fit the wishbone onto it's spindle. It's not easy but with careful fiddling, it works.