Technical Service Bulletin Transmission Noise While Coasting in Car

Subject: Transmission Noise While Coasting   Models: 911 Carrera 1987

Bulletin Number: 87 – 08

G50 Transmission

A support brace is installed between the transmission and left side exhaust manifold (arrow in picture) to avoid noise from 2nd and 3rd gear while coasting at engine speed of 3000 to 4000 RPM.

From Production Date: August 24, 1987

VIN (approximate)

91JS 12 0323 Coupe

91JS 12 5061 Club Sport

91JS 16 0290 Targa

91JS 17 0296 Cabrio

This support brace and can installed retroactively (from Model Year 1987) when repairing cars with the above mentioned symptoms.

Part Numbers:

Brace:                   950.301.401.00

Lock Nut:             999.084.423.02

Tightening torque: 24 Nm (17 ft. lbs.)

Conversion time: 30 T.U.

Important Notice: Technical Bulletins are intended for use by professional technicians, not a “Do-it-yourselfer.” They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Use of tools and procedures other than those recommended in these bulletins may be detrimental to the safe operation of your vehicle. Properly trained technician have the equipment, tools, to the safe operation of your vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle may benefit from the information. Part Numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify correct part numbers.

home page:

Want More?

Get the coolest tips and tricks today

Subscribe to our email list and get regular notifications of new videos and blog articles on how to repair your own car.