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Transmission fluid viscosity?

  • 1973
  • 911T
Mileage: 
73 000
Transmission
Houston, 
Texas

In previous responses you suggest Valvoline High Performance Gear Oil for the transmission but do not mention the viscosity (they offer 75-90, 80-90, 85-140).  What is your preference? If ambient temperature matters I am south of you in the humid heat of Houston.  Would this be suitable for the differential as well?

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