I only raced once and even with the mamba max on a grippy surface with jumps and bumps the rear diff outdrives were fine.. That said, DCM is right, they wont last forever being plastic...
The diff was HORRID after one race though because there was no slipper. The diff plates were heavily grooved from slipping (something has to slip I guess with that much power).
I now have the Tamiya slipper (with B4 spur and pads, so it is proper 48 pitch).
The kit shocks are probably fine if you ditch the kit oil and put in quality 70-80wt all round. If you go for the mamba max and want to race though then definitely need proper shocks to make it stick to the ground. I found it frustrating to race with the kit shocks - I knew why it was bad and there was little I could do about it (apart from totally change the shocks)
The B4 shocks are a better fit and are slop free unlike the kit or official hop-up shocks. I am now racing the tamiya hop-up shocks and with a decent setup (hard piston all round, 40wt front, 30wt rear, white tamiya TRF springs rear (similar to AE green), blue AE springs front) they seem pretty good - but from the box they are worse than useless, simply far too soft.
I drove it for photos only with the fixed 4WD - I put the centre one-way in for racing, it makes the care more lively and turns nicer.
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