After filling my diffs in xt2 with the correct xtm diff oils front 50,000 front 70,000 centre 30,000 rear,the car front diff seems to take too long to transfer the power so i asked some people at a local track i was told at a local track that these oils were miles out ( no one who knew an xt2 ) is this because there are a plantery diff and not a spider diff ? whats oils should i use ? or does any one know if spiders are better also are they available ? many thanks andy.