It all depends on the track. I always speak to those who have raced at the track I am visiting or looked at setup sheets. Sometimes you might find the track you are going to in the setup sheets section. In the rear of my T4'17 I run anywhere from 1k to 3k in the conditions you are mentioning. As for front geardiff, I do not run that anymore but when I did I ran 1,000,000. I wouldn't run any thinner in mod. Well, to be honest, I wouldnt run a gear diff up front anywhere if I were running mod. A spool makes my car easier to drive fast and is more predictable.
If you do go geardiff up front make sure you shock pump all of the air out of it. Fill it completely.
But if i were going to visit a track and I had no info I would start with 2K.
Hope that helps.
Michael
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