4 wheel drive class c

pnichols wrote:


You mean that when you jack up one side of the rear of an E450 with a transmission mounted drum emergency brake engaged to change a tire that the emergency brake will NOT keep it from rolling off the the jack? THAT'S AFFIRMATIVE

If so, doesn't this also then mean that when you jack up one side of the rear of an E450 with the transmission in PARK that it can even then still roll off the jack? CORRECT

Maybe I gotta have another cup of coffee, but so far something doesn't smell right here:

1. How can it roll off the jack without the jacked axle having to turn the locked driveshaft (... locked from the drum emergency brake at the transmission and/or the park gear inside the transmission)?
BECAUSE IT'S AN "OPEN DIFFERENTIAL" SO THE WHEEL WITH THE POOREST TRACTION WILL BE THE ONE TO SPIN. NO DIFFERENT THAN IF YOU JACKED ONE WHEEL, PUT IT IN DRIVE AND GAVE IT THE GAS. THE WHEEL YOU LIFTED WOULD SPIN.

2. Where are all the lawsuits against Ford from owners of E350 and/or E450 chassis (and/or other Ford truck chassis) with transmission mounted drum emergency brakes and/or who put their transmission in park gear - but still had their vehicles roll off jacks?
CAN'T SAY, BUT THE FORD F-53 CLASS A'S WERE LIKE THAT, AND I THINK THE CHEVYS WITH "AUTO PARK" TOO (NOT CERTAIN ABOUT THE CHEVYS BUT I AM ABOUT THE FORDS). SCHOOL BUSES I USED TO WORK ON WERE LIKE THAT TOO, SO I IMAGINE IT WAS COMMON ON MANY MEDIUM DUTY TRUCKS. E-350, NO. THOSE HAVE CABLE OPERATED PARKING BRAKES IN THEIR REAR DRUMS. THAT SAID I DON'T KNOW WHAT THEY USED WHEN THEY WENT FROM REAR DRUM TO REAR DISC.