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sounds like the parking pinn or [pawl] Inspect the parking pawl as it is likely broken. The pawl is a metal pin that engages the transmission's gear when the transmission is in the "Park" position. The pawl manually locks the transmission's gears and is located on the interior side of the transmission's manual control linkage
If it will crank and start when in nuetral but won't crank over at all when in park then you may have a failing Park/Nuetral safety switch. This switch goes by a variety of names such as transmission range switch, PRNDL switch, etc., and when they begin to fail they can produce the symptoms you are having. There also could be a transmission shift linkage problem that is preventing the switch from fully reaching the "park" position but that is quite rare.
Disconnect the shift linkage at the transmission and see if you can move the transmission lever into park manually. If you can't, then the internal trans linkage has a problem and pan will need to come down to find out why. If you can do this, then re-connect and adjust the linkage.Check any bushings on linkage pivot cranks...If a bushing is gone it may not be allowing linkage to move all the way to where it needs to go.
It sounds like you might have blown an axle. Especially if there has never been any transmission problems before. You said the fluid looks fine, and by that I take it to mean the fluid is clean and red, and its full. A blown axle will make the click noise, as the splines on the end of the axle are trying to mesh with the splines inside the transmission. The problem could be in the trans., but I'd pull the axles out first and check them, as axles are a lot cheaper and easier to change than a transmission.
It sounds like you broke the sun gear shell in the transmission. This is real common on 4L60E. The transmission will have to be disassembled to fix it. If this is what is wrong it will have no reverse and hold 1st till about 30 and then skip 2nd, right to 3rd. Then never shift in to 4th.
Sounds to me like you are having a transmission problem. Basically your transmission has gone into "limp" mode which is why you can drive your car up to 25mph but no further. Basically your transmission has limited it self to reverse, neutral, and 1st gear. Take your car to a transmission shop and have it diagnosed. Often a simple flush and fill will fix the problem, but you might need a new transmission.