Yeah, everyone who has rebuilt the axles usually takes 2 shims out. The lipo pack needs to be around 80mm x 35mm in size, either a 2S or 3S, to fit on the link plate. Anything bigger will foul the links. Look at around 1500mah packs. That should get you up to an hours crawling from it, the 1500mah packs in my twin motor berg crawler will run for over half an hour with 1500mah 2/3A cells no problem.
Not surprisingly marine grease is available from boat chandlers, a search on ebay will throw up many suppliers of small tubes.
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