Cappy,

Each aircraft I flew had different procedures for the emergency descent.

The 727 had a very fast rate of descent since you would use the spoilers and landing gear to add the drag.
The 727 would come down like a manhole cover with an anvil tied to it!  :o

This is assuming no structural damage exist.

The 767/757 procedure is a bit different. Only the spoilers are used in the rapid descent procedure.
A max deck angle of 10 degrees nose down & VMO - 10 knots. The use of the auto-flight system is encouraged.

I don't remember, but I think we would use the gear once we slowed to gear extension speed located on the placard next to the gear lights.

Lou