U Bolts from a Dakota rear end working on an 8 3/4. Has anyone used this or heard of this.

I have Dakota Ubolts on my 8.25 diff in my Dart.
They have the flat area.

The diff I have is an original 73-74 Mopar 8.25 with Jeep Grand Cherokee gears and sure grip in it with the Cherokee disc brakes.
The Mopar 8.25 and the Dakota 8.25 both have 3 inch tubes, as does a 8.75.

But the Dakota 9.25” has 3.5” tubes. I know this, because my ‘02 Dakota has a 9.25” rear axle with 3.5” tubes. Look at the tube diameter at the perches, and look at the tube diameter at the backing plate.

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So if you buy Dakota U-bolts, you’d better make sure you’re getting them for a Dakota with an 8.25” rear and not a 9.25” rear.

And I’m with @RustyRatRod, if you don’t over torque the U-bolts you don’t need to worry about if the bolts are flat or round. The dimpled tubes come from guys over tightening the U-bolt nuts.