1/8 scale buggy conversion - help please!

[padailey]

Well I've been taking it pretty easy so far... well at least not trying to mash the throttle too much and not from a dead start. But I experimented and was at a stop but on the throttle just a tiny bit so I could hear everything wanting to go forward (kinda like setting your throttle for a little creep) and mashed it... wow worked great!! So I went to the dirt and from dead stop.. throttle at neutral.. mashed it... @$#%$%^$# awful noise... thought the spur was gone, but its not. Please don't tell me its the diffs?!?!? I'll tear it apart tonight or tomorrow to check. What weight of oils are everyone running in their diffs? Wondering if I can just kinda follow what the nitro guys are doing or if I need something different. Also because my buggy is so heavy do I need to adjust for that.