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Volvodad lists the most likely causes, but since the dashlight is on the same terminal of the relay as the solenoid, the dash light not working usually means the 4th gear switch on the tranny is bad if the fuse #11 is good.
Since you are positive the fuse is good, with ignition on, engine off, gear in 4th, push bbutton and listen and look.
Relay clicks and dash light comes on, lean out and listen for solenoid under auto to click also as you push the button. Check wires on solenoid if dash light on, and no solenoid click.
No dash light or relay click. Pull shifter fuarther back and to the right and try again. If you get dash light and relay click, 4th gear switch is bad.
Since your loss of OD occured with the lifting of the rear end for the tire changes, do not rule out low tranny fluid if the dash light is on and the solenoid clicks.
The tranny shares fluid with the OD and the fluid must get over a hump to get to the OD. Most fluids do not climb over obstructions. A slow drip you'd never notice on the drive over tens of thousands of miles could drop the level far enough to cause a problem.
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