kj_cinci said:
With the help of springs and struts... now you're going to lift the whole rear end on the rear end... putting it all in an angle plus the pressure point of about 2" diameter right uner the diff compired to evenly spread over the axle to the rear wheels...?!?
Not arguing just asking... it can't be as 'safe' as the sub frame of the car etc...??
Actually apart from the weight of the rear wheels and driveshaft all the rear weight sits on the spring perches on top of the axle tubes. If we remember our highschool physics class the direction of the force would be straight down through the axle tube at the spring perch.
When I jack up the rear from the diff it's because I want the rear weight to be sprung such as when I replace the rear control arms.
So I lift it from the diff to place it on axle stands.
Only an idiot would get under a car with only a jack holding it up.
One way to look at it is that my floor jack has a 3"Dia. pad which has an area of 7 square inches.
With a 47% rear weight distribution at 3500Lbs. the rear weight is 1645Lbs.
1645/7=235psi. which is not very much for a chunk of cast iron.
If I was worried that I would break the diff from jacking the car I'd be more worried about my Aprox. 500 drag launches the car has already made :tongue
I'm not arguing either just looking at it from a different perspective.