Differential cover bolts
 

Im going to be replacing my differential cover soon and my bolts are in bad shape so Im going to replace them.
Wondering what size bolt and grade I need? My differential is an 8.8" LS

Ford 8.8 RearDifferentialCoverBolts, 10ea, 13mmHexHead (1/2" Socket if rusty\worn). Soak with PenetrantOil for ~hour before trying.
Don't have here the ThreadDiameter or ThreadPitch or ThreadLength.
Be sure you can loosen the FillPlug before you open the cover or drain the Diff; if FillPlug is stubborn, don't want to drain Diff until you solve that first.
Can remove TopCenter Cover Bolt & take that to your local hardware or order online & get equivalent FlangeBolts;
this is just a cover bolt, not a structural bolt, so does not need to be Grade8, Grade5 should be plenty strong.
Torque is 33fp, again just a cover bolt, so don't over tighten.
Use a dab of AntiSieze\AxleGrease\Vaseline\GearOil on the threads;
a courtesy for next poor bas'ard who works on this vehicle+part.