They use the ZF4HP22 on... let's see: BMW, Jaguar, Mercedes, Audi V8, Maserati Biturbo, Porsche, Volvo... oh, yes, and on the Range Rover. You were concerned about the gearbox's performance, you said? BTW, that's what I have, and I love it. Smooth, reliable, and the 4th gear locks above...