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I believe it will bolt on but from what I run into is the taper on the pitman arm is a little differant than the taper on tie-rod. I tried to swap the pitman arms and found the shafts out of the boxes were differant diameters also. So i waited and came across a 66 p/s box. Hope this is of help, Rick...
 

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I have a 66 Malibu and about 15 years ago I did some upgrades on the suspension. I used a power steering gearbox out of a 78 Trans Am. I had to change pitman arms, but the splines matched up on the "new" box ok. I think the GM gearboxes for front steer cars will interchange up to 81. I could be wrong on that, but the TA box worked great on my car, as well as the big front sway bar.
 

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When changing steering boxes, you have to keep the pitman arms with the box. the difference is in the shaft diameter. a manual box arm will not interchange with the power box arm. I've made the swap many times.
 
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