I read into your posts that your truck has A/C - the original condenser was probably an early design and not very efficient so you have the option of upgrading to a bigger surface area unit and they can be had relatively cheap but it might take some adapting for line connections. One of the biggest enemies of these trucks is heat. Having an efficient cooling system is a safeguard between you and cracked heads. Another worthwhile mod is the clutch fan delete. Installing an electric thermofan has a ton of advantages and you can pair it with a bigger A/C exchanger fan.