I've just done a power steering upgrade on my bj45. Definitely the best mod I've done.
I used a ln106 hilux power steering box and made a bracket to suit. It sits in the same spot as the original box, picks up the same mounting holes and uses all the same steering linkages including the 40 series arm off the box.
I've heard the 60 series conversion has a better lock/turning circle
I have a 60 series box and steering linkages I bought but didn't use if you want to go that direction.
As far as pumps go I would think about an electric hydrolic like the Astra pump. I hear this is the way to go.
I do however have two 40 series mechanical pumps if you want to do it on a budget
Will see if I got a pic of my bracket I made
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