GM Service Manual Online
For 1990-2009 cars only

CONSOLE SHIFT WON'T DISENGAGE FROM PARK

MODELS AFFECTED: 1986 ELDORADO AND SEVILLE

Some 1986 Eldorado and Seville models may experience a condition which prevents the transmission from being disengaged from "Park."

To correct this condition, the following procedure should be followed:

1. Remove shifter handle by removing the handle retaining clip (Figure 1, Items 1 and 2) and pulling the handle upward.

2. Remove the park lock detent rod (Figure 1, Item 3) and insert a new detent rod P/N 1643023 in the shift control (Figure 1, Item 4).

3. With the shifter in the "Park" position, install the height gauge (included with Bulletin) over the new detent rod and cut the rod off flush with the top of the gauge.

4. Using a fine grit sandpaper or emery cloth, dress the cut end until it is square and smooth, removing any ridge lines resulting from the cutting operation.

NOTE: Top of rod must be cut squarely and be free from burrs and/or taper. Each rod must be sized to the specific shift control in which it is used. Do not size the rod before it is needed.

5. Clean any debris found on the rod or in the control tube and lubricate the detent rod using a white non-corrosive lubricant and install the rod in the control tube.

6. Replace the handle assembly with the appropriate part number listed on the attached chart (Figure 2).

Handle Assy Complete Fisher Handle Part Number Trim Code Color -------------------- --------- ------ 1643445 848/7713 Black 1643446 9576 Dk. Blue 1643447 8247/9595/7713 Dk. Gray 1643448 8577/8249 Black Cherry 1643450 8577/8249 Carmine 1643452 8782/9802/8790 Dk. Driftwood 1643453 8789/8796 Dk. Emerald 1643454 7042/8803/8804 Very Dk. Yellow 1643455 8783/8795/8249 Dk. Quartz 1643456 8841 Very Dk. Sapphire 1643457 8781 Garnet Red 1643458 9831/8838 Med. Amethyst 1643459 8843 Dk. Rosewood

For warranty purposes, use T6173 for .5 hours.


Object Number: 79341  Size: FS


Object Number: 87758  Size: MF

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.