Hotchkis 80390 TVS System, Stage 1, 67-72 C-10 Small Block, 4'-6' Drop, 2WD - Manual (Page 76)

6R
Weld Support Gusset
Use hardware bag#17118-3 and mount the support gusset as shown in the picture.
Grind away any rust, paint or dirt near the top and bottom of gusset. Stitch weld
the top and bottom edges of the gusset to the trailing arm. Spray paint the gusset
once you finished welding.