Okay, just checked. Daniel had put these springs on before I got the chassis from him. The fronts are OME 761, the rears are 764. These are listed as 2" medium duty for the RRC but I seem to recall being told they give a 3" lift on the D90. Not so sure...
1991 RRC 4.2, R380, LT230, TrueTrac, Detroit, sliders, 33s, blahblahblah....
1994 RRC LWB
1994 RRC SWB
1995 D90 project