Noises from the transmission can be anything from a "clunk" to a "screech". Before doing some troubleshooting, make sure the transmission has good transmission fluid in it.  If you are unsure about the condition of the transmission fluids, a transmission fluid flush and refill is highly recommended.  Mazda recommends a 75W90 weight transmission fluid.  We recommend using a good, quality synthetic transmission fluid.  Whatever transmission fluid you plan to use, please ensure the fluid is compatible for "modern synchromesh transmissions".  Ensuring that a good (synthetic) transmission fluid is being used, this gives you the best lubrication and protection inside the transmission and gears.
FC3S Pro:  Mods, Transmission Fluid

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