Re: Locked Rear end
Posted by HH56 On 2010/11/28 17:57:55
Not a common problem on that era Ultras that I remember--later Twin Ultras, yes. Maybe Ross has come across it.
To move the car, you have the option of disconnecting the drive shaft and hauling to where you can work on it or get under & drain & remove the oil pan and see what has happened.
If you can't move the lever on side of case at all, even with it disconnected from linkage then possibilities are the manual valve has stuck, the linkage has a problem inside the trans, or the detent plunger assy might be sticking or screwed in too tight. The first pict shows some of that linkage, manual valve end and a corner of detent. The nut clamps the assy onto the shaft coming in from outside. If memory serves, the detent plunger assy also screws in from outside and is by the neutral safety switch. On the other side of that valve & link assy is the cam working the park pawl which meshes with the parking gear located just ahead of the tailhousing and above the shaft.
There is a pawl on a lever attached to back of case that pushes up into the park gear when in park. When you put it in park, a cam arrangement on the manual shift lever forces the pawl up against a couple of springs. When the sections line up and pawl can slide into gear, it will. When taking it out of park, the shaft rotates and cam moves away. A spring on the lever is supposed to bring the pawl down. If the pawl is bent or excessively worn, it might have jammed too far in the gear or perhaps the spring to pull it down has broken but neither should keep the entire gearshift lever from moving.
Anyway, some things to look at if you decide to give it a go.
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To move the car, you have the option of disconnecting the drive shaft and hauling to where you can work on it or get under & drain & remove the oil pan and see what has happened.
If you can't move the lever on side of case at all, even with it disconnected from linkage then possibilities are the manual valve has stuck, the linkage has a problem inside the trans, or the detent plunger assy might be sticking or screwed in too tight. The first pict shows some of that linkage, manual valve end and a corner of detent. The nut clamps the assy onto the shaft coming in from outside. If memory serves, the detent plunger assy also screws in from outside and is by the neutral safety switch. On the other side of that valve & link assy is the cam working the park pawl which meshes with the parking gear located just ahead of the tailhousing and above the shaft.
There is a pawl on a lever attached to back of case that pushes up into the park gear when in park. When you put it in park, a cam arrangement on the manual shift lever forces the pawl up against a couple of springs. When the sections line up and pawl can slide into gear, it will. When taking it out of park, the shaft rotates and cam moves away. A spring on the lever is supposed to bring the pawl down. If the pawl is bent or excessively worn, it might have jammed too far in the gear or perhaps the spring to pull it down has broken but neither should keep the entire gearshift lever from moving.
Anyway, some things to look at if you decide to give it a go.
Attach file:
(15.30 KB)
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