Originally Posted by ch7472
I think you will find it is a BW not an 8".
Righto - I couldnt make any sense what so ever out of these codes
This one was on the tag - WDW-2 4MA8008550B
above the A may very well be a 6 and the second 8 a 3
if it was a 6 and 3 respectively sneaky suspicion that would make it 8" with 3.55 gears?
On the front of the diff head/housing cast into the top left was - 4L21
Also upon inspection there is a definate weld bead approx 3 inches either side of the housing around the circumference of the axle shaft where the diameter of the axle shaft becomes smaller by about 5mm. No it is not a smooth taper.