New 26 Spline Input Shaft 8620 Alloy Steel Upgrade for 2/01-2004 Ford Mustang 4.6L TR-3650 5 Speed Transmissions. Input Spline upgrades end user to a 1 1/8" Diameter, from the original 1 1/16". Simply installing the Input Shaft as an Upgrade has proven to increase the Torque Capacity of Stock TR-3650 to 450 Torque.
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