You sure it’s overheating? Hard to get a ZF hot as it spends 99% of its time in Lockup, so minimal converter action except for a split second during gear change. Usually stall is the only time you would have heat buildup, unless of course the clutch packs are slipping. However I have noticed whilst doing some testing towards getting a good 60ft that the transmission is quite smart and makes a lot of decisions on its own and often locks out modes and gears. This quite often catches you off guard if your not aware of why. The flashing D could mean a few thinks but I have noticed that if I miss a gear in the Auto when in manual mode and bounce off the limiter it spits it at times and goes the “Flashing D” Turn the key off count to 10 and start it and its fine. If you where doing track work did u hit the limiter at all during that time? ← I beg to differ... Drive an auto hard, and it definitely warms up very quickly too. Many guys have found their auto trans overheating during track work. And it doesn't take too many laps either. Diffs too. Oil boiling and pissing out of breather. Not real flash for a so called performance car! Solution is a good sized auxilliary trans cooler, easily fitted in front of the radiator. As to diff oil boil over..... Don't know if its possible to weld some cooling fins onto diff housing to help dissipate heat? If really serious about track work, I guess you could fit a pump and oil cooler for it too... Otherwise drive smoother, keep the radius of the turns as wide as possible (start wide , come in to apex, finish out wide) .... reduce the increased slip inherent with taking sharper turns. I wonder if power sliding (a' la drifting) would mean less differential speed between each rear wheel, therefore reduced heat buildup As you get pulled over for another sideways excursion on the street....... "Honestly Ossiffer... I was only trying to reduce the heat build up in my diff." ←