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Honestly I never even add more grease to what's already still on the diffs out of the bag from JRC. I wouldn't mix the crimson with that stuff so if you want to use your crimson I'd wipe off the stuff on there first. The crimson is a lithium based grease and from what I just googled you should be careful of using lithium grease on plastic because some of the additives in certain blends are harmful to plastics but most general purpose greases are fine. Just don't use too much if it's really thick/tacky.
I also use Super Lube and their various types of oils ,etc.( 20 years now) As well as M1 on steel gears. WP and sticky is what you want. Both are great for BB grease also if you clean and relube them with just 1/3 full.(too much is no good and binds the bearings) Any Automotive Chassis/spindle bearing grease is fine and exceeds RC requirements if that's all you have. The stuff that comes from China and Pan Asia is cheap wax/soap based lube. That's why they all have that same stinky smell. And sometimes appears lumpy when you open up any new diff. Just my observations.