I have a losi 8ight RTR buggy and i just removed all of the grease from the diffs and replaced it with 5/5/1 (F/C/R) oil. the diffs seem to be very rough now and very loud, i have not run the buggy yet, i have just noticed this spinning the wheel on the bench. I am assuming this is not normal, anyone have any ideas as to what went wrong? thank you for your time.