Porsche 911 / 915 Billet Side Cover (TRA 915 301 311 BSC PMS)

915 Transmission Billet Side Cover - Features Additional Oil Passages To Differential Bearing. Designed And Precision Machined In-House From Billet T-6061 Aluminum. 1972-1986 Porsche 911 / 915 TransmissionImportant Note: For Increased Load Integrity, Our Billet Side Cover Is Specifically Designed To Use The Larger 930 Turbo's Bearing - Part Numbers: 999 059 064 00 - Carrier Taper Bearing For Differential (Larger Type) - 1 Required (sold separate)Here Is The Skinny - The Porsche Ring And Pinion Are Quite Small Given The Performance Capability Of The Vehicles. This Reduced Ring And Pinion Size + Use Of Aluminum As The Transmission Case Material + And Rear Engine Layout Resulted In Greater Loading Of The Porsche Ring And Pinion.With So Much Weight On The Back Axle The 911 Is Capable Of Generating Huge Amounts Of Traction - This Is Especially True When Equipped With Wider, Taller, And Stickier Modern Tires. This Grip Is Always Looking For A Way To Escape The Driveline System. Since Wheel S