Just changed my rear diff oil tonight....
Has anyone else forgot to put the small washer on the drain plug?
I didn't see it in the oil pan until I was already done with the change. So, I didn't exactly want to take out the bolt at that point.
Think I'll be okay? I'm torqued to spec. No visible drips, etc.
You're referring to the crush washer? That part is not optional. You'll likely develop a leak with the expansion/contraction of the housing.
You really need to bite the bullet and chalk this one up as a learning experience. Go to the dealer and purchase 2 new washers (drain and fill ports) for about $2 each. Then drain the lube. Call it an expensive flushing of the diff
Some people re-use the crush washer, but you're supposed to replace them. The reason you torque is to properly crush and seal the drain plug against the crush washer.