[NY_Z28Man]

Sounds kinda normal to me. They usually heat up alittle more when standing still. I have a 96 Camaro and that gets up to the 3/4 mark at idle. But once it goes alittle past the fan kicks on and you can see the temp drop down to around 5/8 then start back up once the fan kicks off. Just make sure that cycle is happening when it idles and your truck should be fine. If you can let it idle for 20 minutes and it doesnt overheat I wouldnt be worried about it.