Problems with 210 Ball Diff

[raymondkerr]

Built my DEX210 and have been running it without issue for 3 weeks, last time out the diff appeared to loosen off, and after trying to tighten it, the car had no drive, something slipping bad.

So I stripped down the diff and checked the slipper assembly and pads. Slipper looked fine, however the diff balls didn't look to be in great condition, so I opted for the Lazy Balls and rebuilt the diff again today. However when the car is assembled (Mid Motor 4 Gear Setup) I lifted the car up and by hand, turned one of the rear wheels, the other wheel turned in the same direction, when I put the car down and throttled, I get bad slipping and no drive.

The problem appears to be the same as when the original kit diff balls were used. I'm kinda stuck now with what to try next. The diff was built to the instructions, and I checked the thrust bearing cage and washers, and replaced the e-clip. the diff screw turns on the thrust bearing by hand. The diff was originally tightened full and backed off about an eighth of a turn. The slipper pads are fine and the slipper nut in tightened with about 7mm thread showing.

Any ideas why the wheels are turning in the same direction by hand ? they should turn against one another when off the ground right ?

very confused, all the other gears and the layshaft have been checked, and nothing looks out of place.

HELP!!!