The 1947-54 GMC Master Parts Book has a fair drawing of the T. Question is what is a 2 way and what is a 3 way. I'm guessing 6107373 is a 2 way, 1 way in, 1 way out. I believe the drawing from the MPB shows a 3 way (1 in, 2 out) with the second output line ending up behind the generator in the drawing. I've never seen one of those and don't know what that line hooks to.
My other two GMC Master Parts Books also show all 3 numbers.
The description of 8.4550 is shown below. Not much help.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
