Transmission technology had come a long way over the years. The 4L60 and 4L80 transmissions started a trend with the introduction of performance parts for these four-speed units. Over time, the 4L80 has held its own, and it’s not uncommon to see this transmission in some very fast vehicles. General Motors then went on to introduce the 6L80 six-speed and the 8L90 eight-speed units that are also very robust in factory form. However, as hot-rodding goes, enthusiasts quickly found the shortcomings with these units.
ATI Performance Products is no stranger to transmission performance. In fact, the company has more than 55 years of racing experience and product development. Once again, ATI swoops in to make a good thing even better with its new 8L90E Vasco input shaft (PN 704000). The factory shaft has been problematic for late-model cars making big horsepower, but ATI has addressed and fixed this dilemma.
ATI’s new shaft is made from heavy-duty Vasco Max Aerospace Steel and is abnormally strong and resilient. It is able to withstand even the most severe torsional shock. The unit works like a torsional spring bar that is designed to twist and then return to its original form. This new configuration eliminates breakage and reduces shock to the gear train. The shaft is made from 100-percent American-made heat-treated steel, ground in-house, and offers a tighter spline fit to the OEM forward drum.
For more information on this new input shaft and other offerings from ATI Performance Products, be sure and check out their website.