I am trying to install a new coupler on my steering box. It does not want to go on. Anyone have any suggestions?

Make sure you have the correct one for a PS box, which is different size than a manual box.
The input shaft size on PS boxes was changed around 1980 and those are smaller.
David

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Check my web page for First Gen Camaro suspension info:
David's Motorsports page (http://ourworld.compuserve.com/homepages/David_Pozzi/)
First Gen Suspension Page (http://ourworld.compuserve.com/homepages/David_Pozzi/first_gen_suspension.htm)
67 RS 327 original owner. 69 Camaro Vintage Racer, 65 Lola T-70 Chev SB Can-Am Vintage Racer

They are master splined as well, Will only go on one way.

Also, the bolt must be removed from the splined coupling in order to install it. Align the groove on the shaft to where the bolt goes, and then install it.

Just a suggestion, but you MAY have to spread it ever so slightly to get a sliding fit b/c the new coupling I have is the same way.

I am going to use a fine chisel to spread it just a schosh so it slides on.. And I will do it very gently!!! pdq67