Packer and JQ - I was not talking about changing diff fluids taking too long, just that it is not what noobs or intermediates who race once a month are going to do at the track. And it takes longer than every other change. Not too long, just longer.
For me, doing it on a sloped table (screws rolling off) in the blazing sun (frustrating) with wind blowing sand around (not good for diffs lol) at the track where we only race for a few hrs once a month is not an option.
It takes me about 30mins to change a front.
That is why I asked what is the most effective and fastest answer to each problem. Let's say major oversteer. Do we do toe, camber, arm location or what (first)?
Tyres is not an answer to the noob / intermediate as they don't have multiple sets and will just run what everyone esle runs at that track. So even if it is a wetter / dryer etc day, they will be close enough to having the right tyre.