Not sure where youve heard that from but as a Team Durango driver i think geared diffs are a fantastic idea!
I can change diff oils on tne Durango in under 10 minutes and when built correctly they stay leak free. Theres absolutely no slip in the diffs which gives you awsome acceleration, and the fact you can change oils so quick gives you excellent tuning options.
I know you can tighten or loosen a ball diff but doing this is no where near as consistent as changing oils, plus if you loosen it too far the diff will slip, or tighten it too far and you run the risk of putting too much pressure on the balls causing them to wear away quickly, again not a problem with geared diffs.
Big thumbs up from me
