Ive just got my sierra steering column(adjustable) & coupling from the scrap yard, the coupling is a forged 2 piece affair with a triangular clamp arrangement (just like the one at the bottom of the column,) the lower portion has a rubber uj & the upper portion has a proper uj,
How have people extended these type of coupling, the haynes manual shows a nice round bar between the the two uj's which would be easy to cut & weld an evtension tube to,has anyone any photos,thanks in advance

Do a search on my name and steering column, and all will become clear

Hi dood, I have used this type.
I simply cut the triangle top piece off and welded a length of pipe between the cut and the triangle piece. The triangle fits almost perfectly inside the 25mm pipe as used at the back axle, and I then roll pinned each end and fully welded each end.
Cheers