Billet Extended Spline Input Shaft – 4L80E

For over 40 years Transmission Specialties has been the trusted name in the performance automatic transmission industry. TSI has pioneered much of the technology that is now commonplace in the transmission marketplace. The inventors of the spragless converter and the aftermarket helical Powerglide planetary, TSI is known worldwide for manufacturing and assembling the highest quality transmissions and components. . 4L80E Billet “Extended Spline” Input Shaft The Tsi 4L80E Billet Input Shaft Has All The Latest And Greatest Updates To Make It The Strongest On The Market. Feed Hole Changes Have Been Made To Make The Shaft Stronger. The Splines That Go Into The Od Planet Have Been Lengthened And The Undercut Shoulder Which Has A Very Small Id Has Been Removed. We Also Use A Hobb To Cut This Spline Compared To Others Who Single Point Cut Them Which Makes For A Weaker Spline That Is Prone To Failing. This Is The Number One Spot Of Failure For Other Aftermarket Billet Shafts. Available In 300M For Up To 1000Hp And Aermet 100 For Higher Power Applications