Fell off the jack ,when no wheel fitted - any sign of blood on it?
+1, you can see where someone tried to drill holes in the brake drum at about the 1:00 position, to stop the crack:surprise:Fell off the jack ,when no wheel fitted - any sign of blood on it?
Perhaps I should have asked 'what a Matta is' but I guess it doesn't matta; you said you were a '1900 guy' so I thought it was one of them I'd never heard of.The Matta has completely dedicated suspension and differential. Including much larger diameter axle's. And the diff locates totally differently. The brake drums are cast iron. The (typical) 1900 has aluminum drums with the steel insert as on the 2000. .
Well then perhaps it does matta; if it is a 1900 jeep, I have seen them. I suspect someone may have tried to jack the jeep up with a jack under the cast iron brake drum. The stresses appear to have been concentrated on the drum at about the 11:00 position as shown in your photographs. The jeep may have fallen off the jack on asphalt or dirt, cracking the drum only to fail later. You may want to find a dye penetrant test kit and crack test the remaining drums or take them to a Non Destructive Testing Lab (NDT).The backing plate on a Matta is quite heavy duty, thicker steel than the usual Alfa and it shows no damage. If the car fell off a jack the backing plate (larger OD than the drum) would show some damage, maybe a lot. Dan