TCI 1.82 Powerglide Carrier w/ Turbo Converter Splines, 12 5/8" Length Input Shaft 196999 while the built in SFI

while the built in SFI 3

Increased fuel economy and improved wear at cold start

headers and gears

Works with Factory manifolds or headers

TCI 1.82 Powerglide Carrier w/ Turbo Converter Splines, 12 5/8" Length Input Shaft 196999 while the built in SFIP G Input Shaft(Turbo Spl)1. 82. P G Input Shaft(Turbo Spl)1. 82 TCI Hardened Input Shafts are constructed from hardened, aircraft quality Vaccu Melt 300 billet steel or Vasco 300 high strength steel. They feature increased lubrication flow and strength with a resized diameter that provides optimum stress distribution along the entire length of shaft along the extended high gear splines to the oil ring. See the chart below to compare TCI Input Shaft