4.4 differential broke . ? from staggered rims

[Roman D]

I second that - if your tires have different outer diameter - that will surely cause an issue.
Besides that - I think 8 hrs is a little, how do I say it, only if working really slow.

[kashmir]

i have 315/35 zr 20 in rear and 275/40 ZR 20s in front

[Roman D]

P =
Passenger Car Tire
The first letter indicates the tire’s class. P designates this tire as a passenger car tire. An LT before the tire size would mean the tire is a light truck tire. A European metric tire would have no letter before the tire size.

245 =
Section Width
Tread (mm)
The section width is the width of the tire from one sidewall to the other measured in millimeters. In this example the tire is 245 millimeters wide.

45 =
Aspect Ratio
(Ratio of Sidewall height to width)
The aspect ratio refers to the height of the sidewall. It is a percentage of the section width. In this example, the sidewall height is 45% of the 245 section width which equals 127.5.

Z =
Speed Rating
S = 112mph
T = 118mph
The speed rating designates the maximum speed at which a properly installed and inflated tire can be driven on. In this example, the speed rating is Z which means it has the highest speed rating. Z rated tires will also have a W or Y speed rating indication after the load index which denotes the actual mph the tire is rated for.

R =
Radial
Construction
In this example, the R designates this tire as a radial tire. Radial tires have layers of fabric whose cords run at right angles to the circumference of the tire and whose tread is strengthened by additional layers around the circumference making it the most common type of automotive tire.

19 =
Wheel
Diameter
(inches)
Wheel Diameter specifies the size, in inches, of the wheel that a tire fits. In this example, the tire will fit a 19 inch wheel.

98 =
Load
Index
Load Index indicates the maximum load carrying capacity of the tire. It is very important to only install tires with a load index that meets or exceeds your vehicle manufacturer’s specification.

W =
Speed
Rating
The speed rating designates the maximum speed at which a properly installed and inflated tire can be driven on. In this example, the speed rating is W which means it can be driven at speeds up to 168 mph.

[Roman D]

if you measure you wheel height or outer diameter, you will get a significantly different numbers. If a tire shop did this installation for you and did not give you any warnings - do not go there ever again.

[X53Jay4.8is]

Originally Posted by Roman D

if you measure you wheel height or outer diameter, you will get a significantly different numbers. If a tire shop did this installation for you and did not give you any warnings - do not go there ever again.

You need to check your math again. His tires/wheels are the same height between front and rear. Plus as was stated this is a factory sized spec'd tire set. He did not mess up his diff with these tires.

[kashmir]

according to tirerack...the tires that I used are OEM

http://www.tirerack.com/tires/Select...Standard+Model