When I look at your installation it seems like I need 2 u-joints and a short shaft between?Look into the end of your column and determine what shape the hole is. Is it a DD with two flat sides and two rounded? If so, measure it to see what size, 1/2", 3/4"? Or is it splined? If so count the splines and how wide the hole is, 5/8", 3/4"? Your steering box should have info on the size of the spline of the output shaft. MOPAR is 5/8" x 36 spline, MOPAR ( Chrysler) only. There are other 5/8" x 36 spline which will not fit, needs to be MOPAR. Once you determine both ends then consult Borgeson for the correct U Joint with the correct steering shaft in between. Done. Oh, and once you get to ordering the shaft get one that is long enough to bridge the gap and trim it up once you have the right u joint on the output shaft of the box. I just finished mine.
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Yes you are right, my car is a 73 charger. Need some movement in my coupler you say, does that mean I can not use u-joints on a 73 up, and if so why?Contact Bergman auto craft, they sell installation kits etc. Your car looks like a 73 up so it is important to have some movement in your coupler.
I have replaced the rubber with poly, but maybe you are right, it will probably be some movement there. Is that why I have a spring at the end of my column? Maybe I could take my stock coupler on the columnside and weld a double D shaft to it and a u-joint on borgesonside?The k frame is rubber mounted, unless you have replaced the mounts with something solid. Even so there should be a little fore and aft movement in the coupler. Most stock cars of the era flex around a bit while driving over bumps etc, this can put strain on the steering column etc. Some people will disagree, but I think you need a stock type coupler. Bergman makes a stock type coupler for this, but from your picture there appears to be a lot of space between the shaft and box. I would contact them.