Is this on an X4TE (Carbon one) or an X4pro (Plastic one)?
I am just wondering which gearbox casings you have.
Ultimate advice is make sure you shim the diffs so that they are free but with no backlash. All gearboxes are slightly different and so will require different shimming to be correct. For example when I built my X4 TE I put both shims on one side as per instructions and it was way too tightly meshed, put one either side and it was free and with no backlash. Some have ended up putting three shims inside the box to get the same results.
As for grease I have never run any grease in my gearboxes. Always run them dry or if a little tight then a spot of diff grease, and I mean a little spot. Don't pack them with grease, that causes no end of problems.
Have a look in the x4te build and trick thread for pro4nuts excellent gearbox build advice.
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