Hello there,

Is anyone able to tell me the u-joint size for the steering coupling shaft on a 1988 Chevy G20 (with power steering)?

Gm part number is #26013139

As the part is discontinued I would like to rebuild the coupling shaft but I cannot find which u-joint size is used on either end.
The Acdelco spec for the steering box says input is a 0.720" 26 spline, but I cannot sind that size anywhere. Could it be a 26+4 spline (4 splines cut of for indexing) so the counterpart is a 9/16"-30???
And how about the other end? Is it a 3/4 DD?

THX for any help!