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) NOTE: Use With 915 Transmission Gasket Set # 915 300 911 01Here 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 Spin Is Not An Option The Torque Looks For Another Way To Escape The Driveline. This Results In& Deflection Of The Ring Gear And Subsequent Flex In The Transmission Side Cover. In Extreme Cases We Have Seen Cracked Side Covers - Less Severe Cases Result In Worn Pinion Shafts And Ring Gears.When Executing A Transmission Rebuild Or Adding A Limited Slip Differential We Recommend Updating To Our Billet Aluminum Side Cover. This Is A Simple And Effective Upgrade For Higher Performance Engine Updates Or Applications Where Overall Grip Levels Are Significantly Improved From Stock.Patrick Motorsports USA - Sold Each - 1 Per CarReplaces Factory OE Part Numbers: 915 301 311 00 - Transmission Cover Lateral (1972-1973) Porsche 911 / 915 915 301 311 05 - Transmission Cover 1974-1983 Porsche 911 / 915 915 301 311 06 - Transmission Cover Lateral (1984-1986) Porsche 911 / 915 / 1976-1985 924 Alternate Part Numbers: TRA 915 301 311 BSC PMS / TRA 915 301 311 BSP PMS / TRA-915-301-311-BSP-PMS / TRA.915.301.311.BSP.PMS / TRA915301311BSPPMS /TRA 915 301 311 BSP PMP / TRA915301311BSPPMP SOLID WORKS stress simulation test shown, 11,000 lbs. of load simulated on our billet side cover at final drive bearing race. 04/29/2026
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