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Just changed the lube from unknown but clean to Redline 75w90 NS. I have noticed an improved downshift into 1st already. Before I could get a crunch at any speed above zero . I can now downshift at a low speed roll. I am sure I still need syncros replaced on first but I may be able to delay it until the clutch goes.
Any different choice for RS gears / clutch / LWFW? I changed it once due to a crazy rattle and it helped for awhile...but seems to be back a bit.
the /3x series does make more noise than the /2x series because of the extra 'loose' gears but factory fill is SHC/Delvac for all of the cup transmissions.
You should hear the rattle in a Cup car w/o any insulation at all, you'd swear it was going fall on the ground in a million pieces