[Chrislong]

Grit is not uncommon, but not ideal especially in a new diff. Loosening it more is not the right thing to do though!

Gritty feeling usually comes from the thrust race, id defo replace this every rebuild at the minimum. Turn the diff plates over, and regrease everything.

To clean, I strip down, motorspray everything then individually wipe everything with kitchen roll. Then regrease (AE Stealth Lube, and AE Black grease are best), and re assemble as per the destructions. If its been a while since the last rebuild (it usually is because the diffs are so good) - Renew the thrust race, diff plates, diff balls and lucking nut... infact, when I was running an X-6 I used to just buy complete diffs, as outdrives would wear and replacing those got expensive, may aswell buy the complete diff.