3/4 ton shaft should be too short for use under 1/2 ton, i have napa part number for that U joint here soemwhere, i just got one myself, it was 37 bucks
email me if you need number, napa is accurate when looking up numbers though.
good luck
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Randy- Lincoln, IL
randy@ccaonline.com 2177353230
*many GM parts bought, traded, or sold -am parting out: '81 Cutlass Supreme and 84 SE Firebird T5 3.73
current fleet: -71 C-10 350/CH465/3.07- assembling currently
-90 Cavalier/2.2/sky blue, driver #2
-84 Z28 5.0L/700R4/3.73 daily driver #1
-'90 Corsica 3.1L and '82 purple Trans Am- storing *Paint is overrated* © RSS Enterprises 2000