I have a 2013 Evo X GSR and am at 31k miles.

I have done all the research and looking to change out my trans, transfer case, and both rear diff fluids.

However I will be getting my clutch replaced in March.

Should I just wait until March and have the fluids changed along with the clutch install, or should I replace the fluids now?

Will I be fine in the winter if I wait until March?

Thanks in advance for your input.

 

Tough call. You'll have to replace trans and transfer case fluids when they/you do the clutch. So waiting it will end up mostly getting done anyway. On the other hand if you change now you can check for metal in fluids to see if you have any internal issues that you might want addressed at the time if the clutch swap.

However not sure what you mean by both rear diff fluids. There is rear diff gear oil and ayc fluid (Hydrolic ps fluid) in the transfer case. Those don't get changed with thorough clutch job so you could do them now. But ayc requires dealer tools to bleed. I personally would wait until after or during clutch job unless you were having issues these fluid changes would specifically address.

Take it or leave it... But good luck!

 

The rear diff has 2 sections: the mechanical differential part that takes L.S.D. fluid and the torque transfer mechanism that takes ATF. The AYC pump itself uses ATF fluid and needs bleeding when replaced but for regular drivetrain servicing, the pump doesn't need to be touched.