As Bobbin says I think the geared diffs are a step forward, especially in the dry. Most people seem to use 10k oil in the front and 5-7k oil in the rear.
The alloy gearbox upper housing for the front are good, I haven't bothered with the rear as the plastic one seems strong enough. The alloy front suspension hangars are also good. The new rosé joints also look good as you can capture them so shouldn't pop off, the standard grey ballcups can be a bit weak and pop off a bit too easy.
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