i recently replaced thermostat and still having some overheating issues. is it ok for temp to reach 235 while sitting in drive thru lane or stop/n/go traffic? i had a coolant flush last fall. do you think radiator could be clogged some?

The thermostat is good place to start but there several other things could cause overheating. The thermostat you purchased should have been a good quality 192 to 195 degree thermostat. This should make the truck run around 200 to 210 degrees on average. In the hot Texas summer and with the air conditioning load it maybe as high as 220 degrees. 235 degrees is too hot and 250 degrees or more can cause engine damage. You need to check the fan clutch and for proper air flow through the radiator. An easy test for the fan clutch is let the truck get up to 200 plus degrees and then shut the engine off. Notice if the fan blades keep spinning. The fan clutch should be fully locked at that temperature and should stop spinning almost instantly. If it keeps spinning then the fan clutch is worn out. Also check for debris trapped between the a/c condenser and the radiator. A truck this age may have lots of leaves and debris preventing good air flow through the radiator. Also check for a restrictions inside the radiator. This can be done with a infrared thermometer to see if it has cold sections from the tubes being blocked with corrosion. You could also remove it for flow testing at any repair shop. You also need to check the accuracy of your gauge with the infrared thermometer. Is it actually overheating? You should correct this problem before it causes the cylinder head gaskets to fail or other engine damage. Cylinder head or gasket failure can also be a reason for overheating as well. You are welcome to email me at allmakesanymodel@gmail.com if you need further assistance to fix this problem.