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On a 1998 Oldsmobile Bravada Transmission wont shift past 3rd gear while in drive. Just replaced tranny I didnt plug speed sensor back in. or I think that is was it is. Any input would help?


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2008-02-19 15:38:37
2008-02-19 15:38:37

The trans in your vehicle should be a 4L60. When you say you replaced the tranny,I don't know if you mean rebuilt, or replaced with a used one. These transmissions were used in many Gm light duty vehicles. They largest problem being valve body failures. (control parts) When you rebuild one of these you must make sure the valve body is changes to an updated valve body. Most failures of these transmissions are valve body related. Gm suggested 15 k trans fluid and filter changes. These trans missions will detioriate rapidly if the filter becomes clogged , creating a high pressure and high temperature situation , wich in turn will cause trans fluid to be expelled from the vent at the top of the trans. If you replaced your trans with a problem with another used one, you have a very good chance of having another problem with the "new" one. (unless you know the history of the replacement) I do not think that an inoperative speed sensor would cause the symptoms you explained. The transmission would have a high shift point and would shift hard,but it would shift. If you had someone rebuild it, find out if the valve body was updated/ rebuilt. Good luck Chris advanceserv@comcast.net

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