Would like input from anyone with Riddlers on D30/44 diff's. Just installed mine and switched to 75W-90/75W-140 respectively. I put just over 1qt. front and just over 2qt. rear, I say "just" because Royal purple doesn't feel it necessary to provide a window so to see how much is used. As close as I could tell by mearly holding up the bottles, I added an extra 1/4 bottle to each (1 1/4 front & 2 1/4 rear) hope I'm good. Any thoughts would be appreciated.

 

1.5L front D30, 2.7L rear D44. Maybe a smidgen less on the front--mine wheeped out a little bit after driving through 113° temp's in AZ last summer. Just a tiny bit, not even enough to do more than wet some of the undercarriage and not drip onto the ground. Otherwise, never had a problem. Double-check to ensure that your lube is just above the height of the lower, inner wall of the axle tubes. You can use a zip-tie as a dipstick to do this.