Remco 1. To me the transmission temp is OK. 2. The transmission only has three forward gears. The easiest way to get more low end response is to change the ratio of the finial drive. Only go up one ratio to 3:23 so that your non-towing driving and usage is not effected. 3. Keep the theromstat. The super large transmission cooler may be blocking the other. Rodger & Gabby '47 De Soto Custom w/Fluid Drive & passenger door mounted swamp cooler '63 Le Baron w/F-Sweep trunk lid & std A/C '66 Le Baron w/dual A/C & reverbed AM/FM '70 Overlander - InterNational