The sonnax sure cure kit allows full converter flow in park. It eliminates lock up hunting, it's a different throttle valve profile. Also it increases flow and pressure to the valve body (still regulated by the pressure solenoid though). But on that note...if you towing in O/D at all you deserve what's coming. Dodge is probably the cheapest of the big three to rebuild and I believe it can tolerate the most abuse when cared for (fluids and band adjustments). A deep pan would help too. On my end all I did was weld two pans together and buy the extension block for the filter...cheaper, accomplishes the same thing. Coolers are important but you want to plumb to auxiliary first THEN the radiator cooler because in winter time you want to be able to bring the temp up, I block the auxiliary cooler with cardboard from December until the end of this month. I can't hardly get the fluid up to 140 even towing when it's this cold.

wittrans.com is the place to go...but telling the rebuilder you want new steels, red alto overdrive clutches, sonnax sure cure kit and the GM pressure solenoid will fix the weak spots in the design. Good luck!