Damage to LSD?

[glock 37]

Doing figure 8 's causes the plates in the diff to slightly separate and allowes the fluid to get in between the frictions plates .

I get no more shudder after doing them .

[Ravenslair]

I ended up replacing the fluid. I put in some Lucas 80w-90 and a tube of Sta-lube. I went out and did some figure eights afterward. Almost no shudder anymore. Just a slight amount of slipping can be felt on a sharp turn from a dead stop. There is definitely no more hard grinding feeling.