8 3/4 gear setup

Jadaharabi said
This will be a picture of the two caps off of a 489 housing against each other. You will notice they form a perfect circle. Which tells us that the other side of this is the housing must also form a perfect half circle so whoever comes up with this that the Caps are not cut in the center is full of crap.

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I also took measurements around the circle to make sure it was a circle. The only way these caps would work if they were not split at the center of the hole would be if one side was u-shaped.

I can tell u that maybe 1/3 of the diffs I do has the caps cut in the Center of the circle. I have been doing diffs for 40 years. The proper tools are by far the best and the fastest to use. The old school way was to install the pinion with the factory shim and see what kind of a pattern u got. Then u guessed what shim u would need. When I first started doing diffs I could not beg, borrow or steal the arbour set up. Kim