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And if I remember correctly, it will only work on those TA marked steering boxes because those boxes used a larger diameter sector shaft than normal, similar to what's in a C body. (well, maybe you could use it on a C body then?)


Aren't the repro fast ratio pitman arms marked "Fast Ratio"? Any chance you've found an old repro piece? I think the repro piece is designed for use with the regular diameter sector shaft, so if that's what you've got, it would be easier to use.

Tav



I'm pretty sure the arms and boxes are small sector. I don't think any of the repro's have/had part numbers on them.

The T/A boxes only have different internal end stops. That is so if someone cranked over the steering wheel to the end, and just held it there, it wouldn't force itself so much on the lower control arm to lower ball joint stop or have the tire rub against the inner fender. Sorta idiot proofing.

71 340 E-bodies build after a certain date in spring (March/Feb?) automatically got the fast ratio box and steering arm standard.

There are some C-body pitmans that seem to have the same or close geometry as the fast ratio arm, but the spline is large sector. And the spline indexing is wrong. And you not be able to turn much in one direction, but way to much in the other direction. There was someone once selling a C-body unit like that as a fast ratio. I ran into someone about 10 years ago that had one and figured out the indexing issue and promptly took the pitman off his car.

You could file the master keyways off the C-body pitman and run a 73 up power steering box. I've heard about that. Never seen anything first hand.