my guess would be that you had an excessive amount of diesel fuel fill your engine crankcase. somehow someway that diesel fuel in the crankcase exploded. the fuel was hot from the engine running...even the fuel vapor could have exploded. something along those lines is all I can think would...
Sasquatch24 is right....buy Firestone #2550 they mount under the frame between the axle and the frame. I have had my kit on for over a year now and love it.
If you look at all of there websites (cobbs diesel performance, performance machine, and rebel diesel) they are all located at the same address. Makes it look like they are very much "in bed" together. What a piece of work!