- Jun 5, 2002
- Iowegia - USA
"Synchronized in all forward gears and reverse." Which means it needs friction modification chemistry. None of articles linked ever addresses the friction modification chemistry. How many Documented transmission failures have been presented from owners using ATF+4?
There has been much [quote]controversy regarding lubricant selection, with many owners and industry experts arguing that using ATF+4 to lubricate the transmission, as Chrysler recommends, can cause it to fail prematurely. Mercedes-Benz recommends a thicker 75W or 90W gear oil in their trucks that are equipped with the G56. It is debatable whether anything is gained by switching to a 75W/90W gear oil, but many owners choose to do so. A tooth was removed from the input shaft gear for the 2007.5 model year, resulting in a ratio change for the 6.7L Cummins version. When equipped in 6.7L applications, torque was derated to 610 lb-ft for 2007.5 to 2012 model years, and has been derated to 660 lb-ft for 2013 to current model years. Meanwhile, the Cummins Turbodiesel is available with up to 900 lb-ft equipped with an automatic transmission.