Seville V8-273 4.5L (1989)
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Missing or Mislocated Checkballs (2, 4, 12). (Refer to Figure 2).
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Sticking 3-2 Coast Down Valve (218) in Oil Pump Assembly (44).
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Improper TV Cable Adjustment. (Refer to Section 7A of the appropriate Service Information Manual for the proper TV cable adjustment
procedure.)
IMPORTANT:
DO NOT USE General Motors limited slip differential lubricant additive or equivalent to eliminate undesirable "shift-feel" to reduce harsh shifting or to
minimize torque converter apply/release "shudder". This will prematurely distress the clutches and bands in the transaxle/transmission by elongating shift
engagement times and increasing slippage between surfaces, even though it might provide better shift-feel for the customer at first. The customer will be
pleased at first but will be back to the dealership with a distressed transaxle/transmission.
I. Very Harsh Part Throttle 3-2 Shift At 20-40 MPH
1985-1990 DeVilles and Fleetwoods and 1986-1990 Eldorados and Sevilles
Service Procedure:
A part throttle downshift is a quick apply of the accelerator pedal beyond a medium throttle position (approximately 1/2 of accelerator pedal travel),
forcing a downshift.
