dorman slip joint steering couper

does any one know if the dorman part# 425-252 steering coupler fit on a manual steering box or are the splines different. They list them to fit dodge
trucks 73-80's with power steering they sell for around 45 dollars alot cheaper
than what they ask for couplers on ebay.

You asked if it would fit a manual box.
That part is for a power steering box, it will not fit a manual box. The manual box input shaft is a larger diameter than the power steering box input shaft.