Talkin’ ’Bout My Gen-eration
A perfect example of rapid transmission evolution is the ZF six-speeds. In these units, modifications to the mechatronic (Figure 1) were made in 2006 to increase oil flow, which reduced the duration of the shifts. So ZF6 “Generation 1” ranges from 2000 to 2005 and encompasses the ZF 6HP19/26/32 versions; ZF6 “Generation 2” ranges from 2006 through current production and refers to ZF 6HP21/28/34 units. These 19, 26, 32 and 21, 28 and 34 numbers designate sequentially larger amounts of torque capacity of the transmission.