Those don't look like they were used gently. They are guaranteed tough, not guaranteed to go through Heck and back!
Good luck finding any manufacture who would warranty a tool that look's like that. They don't crack like that on there own, those took a hefty drop or two.
Those drill's have been left out in the element's as well. Corrosion build up on the magnesium casing. I can see all kind's of gunk on the motor housing. Take better care of your tools buddy, and they will take care of you.
You could always take advantage of DEWALT's GRC. The GRC for the DC988 is $99. You could have them both back in brand new condition and running well for $200. Or you could throw on a new clamshell yourself in about 6 minutes. Nano base is $11.45, and NiCd base is $9.98 for the pair. The gear case that you cracked will set you back $55.
hammer drill major FAIL
in Dewalt
Posted
Get one of these and you won't have this problem: http://youtu.be/shXjzMurY8w
Don't give me that grass crap! The DeWalt would shatter! I'm not saying the bosch is better in every regard, but durability is definitely their game!