Bear What does the VIN plate on your 940 say insofar as the chassis codes go?
Here is an example: The chassis code for this car is AA4GH15.

That code corresponds to the front and rear spring and shock codes, plus the sway bars info, which can be found in the Volvo Pocket Data Books.


EDIT:
Did a little homework on rear springs -
types 1, 2, and 3 rear are fibreglass leaf springs used in IRS2 960 95+
type 7 rear is used on standard 740 wagons
type 8 rear is 11.9 mm wire diameter
type A rear is used on 740 wagons
type C rear is 11.3 mm wire diameter
type H rear is 12.1 mm wire diameter
type J rear is also used on V40 / S60 / XC60 / XC90
I can't find info on spring rates, free length, or length at load unfortunately.