Hi Joe,
i can understand your confusion about the diff oils.
From my understanding the Durango diff oils that come with the new kits should be 10k and 5k so not sure why they say 50k and 100k, that would be way too thick and im sure its not the case.
I always say you should decide on one brand then stick with that brand. That way you know exactly what your using and stops any confusion.
If Team Associated do not go any higher than 10k then i would choose another brand as you will defo need to use higher than 10k in the front. My prefered brand is the Ultimate stuff which is all ive used since i got my car.
In regards to how different weight oils effect the handling of your car is quite simple. For example if you ran a really light weight oil in the front then the diff would free to rotate quicker when entering a corner, therefore making the steering really responsive. If its really light in the front then the diff may actually diff out under power which would give you less steering on corner exit. The opposite is true when you go to a really thick oil in the front which basically slows everything down and numbs down the responsiveness and amount of steering you have entering a corner off power. When your on power you will have more steering as a thicker oil in the front makes the diff act more like a solid axle.
For the rear if you use a light oil you will have more rotation whilst turning which should give you more side bite. Thicker in the rear will reduce your turning radius giving less side bite but more forward traction.
Im not sure if the DEX410 comes with the same oils as the 'R' version.
Hope this helps.
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