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Trying to verify whether or not the 8 3/4" rear end in my Dart GT is a sure-grip. With the rear axle up on jack stands and the transmission is in neutral. When I rotate the passenger side wheel, in the forward direction, the driver side wheel also rotates in the same forward direction. If my...

Looks like I may need to have my 3.23:1 sure-grip 8 3/4" rear-end rebuilt. I have an appointment to take it to a very reputable Mopar man in late August (after the Woodward Dream Cruise). I have no idea what a rebuild will cost. Anyone have a "ball park" figure?

My mechanic/buddy swapped the LD4B intake, 1406 carburetor, and Lokar throttle and "kickdown" cables onto the 318 in my Dart GT. On the ride home I noticed it shifts rather late (at the speeds stated above). I think I need to get the shift points down to ~15mph and ~30mph. Most of the roads I...

Hey all, After checking the level I'd like to add some gear oil to my 8 3/4" 3.23:1 Sure-Grip rear end. I purchased a quart of Valvoline 75W-90 Gear Oil. On the label it says "Limited Slip". Does this mean I do not need any additive for the sure-grip? The 3 guys at the Auto-Zone each had...

I've got an 8 3/4" in the Dart GT. I've noticed some gear lube drops on the floor under the rear differential. How do I check the level? What should the level be? If it is low, what type of gear oil do I fill with (90W?)? Any specific brand? Does sure grip make a difference additive wise...