When / How should the diff oil ( the 1 under the spare in an 87 GL 4WD) under be checked

 

A. Cold No engin running in Park

B. At idle in Park

C. At idle in N

D. warmed up in Park

E. Warmed up in N

 

Thank you in Advance

> When / How should the diff oil

 

 

 

I check it before moving or starting the car after it has been parked overnight, on a level surface. Do remeber to check it once in a while. I had a differential fail from no oil -oops.

 

Actually, the bearings on the pinion shaft failed, letting the pinion hit the differential carrier whenever there was no load on the engine.