11-05-2022, 01:01 PM
The best gear oil we have found for 3 or 4spd boxes is a GL4 75/90 as it's a light gear oil the actual viscosity is 30/40 it's available in semi or fully Synthetic the fully Synthetic we use for racing due to the high temperatures the race boxes generate. The semi for general use, you only need 1pt -1/2ltr in a 4spd box both 3 and 4spd benefit from having a seal fitted to the front cover.
Terry.
Terry.