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Discussion Starter · #1 ·
Now changing from manual to power steering in my 1966 300, using an A1Cardon replacement unit part number 27-6509, which is for '64-'73 Chevelles. The problem is that the old, splined metal yoke (coupler) off the input shaft of the manual steering box does not fit the input shaft to the new power steering box...yoke is too small. Where do I get the right size? I need a part number and source.

Second, I ordered a pitman arm for the new power steering box. It looks identical to the manual steering pitman arm, which is still on the old manual box. What is the difference supposed to be? Need to know when I have the right one.

If anyone has any other hints about steering pump, hoses, etc for this setup it will be much appreciated.

Thanks!
TXCR13
 

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I think the tapered hole in the tie rod end of the pitman arm is a different diameter. This would of course mean that the diameter of the tie rod end is also different.

As stated above, the input shaft diameter is different for manual and power as far as I know.
 

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Discussion Starter · #5 ·
Thanks, guys.
As I mentioned at the start, the input shafts are obviously different size...that's why the old coupler won't fit the new steering box.
I did manage to find the coupler required. The Chevrolet part number is 7828871, but it is generally unavailable through dealers. The same part produced by Dorman products is part number 31015, and costs about $50. Dorman parts are available at many auto parts stores, and they can order this part.
A number of the large Chevelle restoration firms also sell the couplers, from anywhere from $30 to $70.
As far as the difference in the pitman arms, I think it may be the tapered hole in the small end that is different. I will take the one off the manual steering box and compare it to the other one I have, which is supposed to be off a power steering box.
This brings up another question...there seems only be one design center link, for use with both power and manual steering. So why the different pitman arms with different size holes if there is only one design center link??
Thanks,
TXCR13
1966 Chevelle 300 2dr sedan
383, 700-R4
 

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The splined axle on the steering box has different sizes man/power. Theres also two centerlinks avaible early and late style the size of the balljoints is different as far as I found out they made them paralell to at least 66 on both power steering and maual. I have the early style centerlink and a power steering box from a 66 cutlass and it was a direct swap.

Marcus
 
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