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9029-226 is .500 longer than the -223 (ball to taper), sits in the spindle nicely, and has long enough threads for the nut.

Now to figure out if i want the extra 1/2"

Also if you ream it a good portion, it will lower the spindles pin or axle to the pivot point relationship correct?

LOL i got the measurements from QA1, they sent me a pdf of all the ball joints.

Anyway, this car we bought had a 1210-508 on the LF, and it has the right taper and thread, but in a screw in...

Good catch, i think i need to swith to this one QA1 1210-106 K727 Lower Ball Joint, Steel Cap, Screw-In

I know with Howe Ball joints they made a screw in, 7 degree with extend threads for this use. Guessing QA1 doesnt yet.

I am using https://www.speedwaymotors.com/QA1-1210-102-K6141T-Lower-Ball-Joint-Steel-Cap-Screw-In,57586.html with the Speedway 3 piece metric, short arm spindles.

I cant get enough threads to...