Passon Performance 5-speed

I've had the Cuda out for a short drive after changing the tranny lube from a 75w140 GL5 to a 75w90 GL4 transmission oil. The clashing is virtually gone. I need to drive it some more under different conditions to ensure that has solved the clashing problem. I have not added the "Lube Gard" additive yet.
Jim

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Did you use synthetic 75w90 GL4 or standard?