Aus eigener Erfahrung ist da was dran. Mein zweiter Baron mit Tauschgetriebe und neuer Firmware im Computer des Automatikgetriebes schaltet ganz anders. Dieses typische A604 spür-und wahrnehmbare Rucken und zurückschalten im Automatikgetriebe ist weg wenn der Baron z.b. an roter Ampel zum stehen kommt. Kann das nicht anders beschreiben ich denke das ist so nachvollziebar. Nach dem Tausch der Getriebe Rechner zwischen beiden Baronen war das Rucken im anderen Baron ohne Tauschgetriebe weg und dafür dann im Baron mit dem Tauschgetriebe vorhanden. Übrigens schaltet der Baron mit neuer Firmware viel eleganter. Weiss jemand ob man irgendwo preisgünstig/kostenlos die Firmware flashen lassen kann ohne 200 € dafür bei DC bezahlen zu müssen. Hier nun die Auszüge, habe ich bei den Amis gefunden. Sieht unten so aus als ob Honda viel zur A604 Getríebeentwicklung mit Hondatechnik beigetragen hat. Ross Bond wrote: "A firmware upgrade is best for the transmission, the biggest problem with the 604, is the clutches are slipped so much between shifts, which gives you a very smooth shift, but makes lots of heat and wears out the seals and clutches a lot faster. Also 1994 and older cars are running on software in the controller which is bad for the transmission. They have what is called EMCC, this means an electrically modulated convertor clutch, which partially locks up the torque convertor to reduce slippage and fuel economy loss in the lower gears, but think about the heat that the convertor clutch is making when it is partially applied. Which in turn kills the seals in the transmission. Some controllers are flashable and some are not. You can update to the newer ones in an older vehicle." ... "you can tell if the controller is flashable by looking at it. It is usually on the pass fenderwell. If it has cooling fins on the side of it, it is flashable. " There appears to be a shift kit for the A-604/Ultradrive transmission, which seems to be based on replacing or upgrading the current computer. Damien Civillo wrote: As I understood the shift kit it was similar to one for a standard transmission in that it replaced/modified some of the parts in the stock valve body so that the fluid flow is different. In other words, since the valves monitor/control fluid flow in the valvebody (the valves are electronic rather then hydraulic) this kit changed the way fluid flows through the valve body so that it modifies the input signals and tricks the tranny into behaving differently. Sort of like the boost bleed switches that some people rig up. We're just tricking the tranny into thinking that something else is happening when it's not. John D. Harmon wrote: "The Japanese influence of the A604 is something that was told to me by a visitor to my site some time ago. He said that while Honda itself didn't have a hand in its design, the same outside company that handles much of their trans designing did the 604 [Ultradrive], and we know that automatic transaxles are a weak link in Hondas as well. He also said that Chrysler badly screwed up when coming up with a maintenance schedule, and didn't properly inform buyers that a special trans fluid, Type 7176, was required. Many of these trannies have failed because people added Dexron III, which is akin to putting a time bomb in your trans."