The Ramcharger has a shorter wheel base than a D150. I'm fairly certain the driveshafts will not swap.

I think there was a car that had a drive shaft that will bolt into your truck. I can NOT recall which model year or which car it was now. It may be a Crown Victoria drive shaft. If so, a conversion U-joints may be needed to install the Dodge yokes. Unfortunately, I just can't remember. Perhaps someone else will know.

You could also have the current driveshaft shortened. I believe that will be cheaper than having one custom built for your application. Call your local driveline shop and ask what they charge to shorten a driveshaft. Prices vary in different locations.