Harsh or Soft 1-2 Shift Feel

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Cause
DEFINITION: One of the two following conditions occurs during a first to second gear steady throttle upshift or a second to first gear coast or a light to moderate throttle detent downshift: Harsh shift feel - an unacceptable quick gear change occurs. Soft shift feel - an unacceptable long gear change occurs.
Automatic Transmission Fluid Level - soft shift only	Low fluid level
Transmission Main Line pressure	Low or high transmission main line pressure
Oil Filter Assembly - soft shift only	The oil filter assembly (100) is missing, plugged or damaged. The oil filter seal assembly (101) is missing or damaged.
1-2 Accumulator Assembly	Misassembled or upside down 1-2 accumulator assembly Damaged or missing 1-2 accumulator piston oil seal ring (137A) A damaged or missing 1-2 accumulator piston cushion spring (139) or outer spring (142) A stuck or binding 1-2 accumulator piston (136A) Debris in the passages of the accumulator cover spacer plate (134)
Control Valve Body Assembly	Debris in the passages of the control valve body (301) or spacer plate assembly (370) Missing or mislocated #2 ball check valve (372) Misassembled 1-2 accumulator valve (340-345) line-up Stuck or binding 1-2 accumulator valve (341) Damaged or missing 1-2 accumulator valve spring (340) Missing, damaged or misassembled 2-3 accumulator valve bushing (345), bore plug (343) or retainers (342, 385)
Driven Sprocket Support Assembly - soft shift only	A damaged second clutch housing oil seal rings (613) or the four lobe oil seal ring seals (612) Worn or damaged second clutch housing bushings (616, 619)
Second Clutch Assembly	Missing or not seated second clutch basking plate retaining ring (627) Missing or misassembled second clutch backing plate (626) Worn, damaged or misassembled clutch plates (623-625) Missing or not seated second clutch spring retaining ring (622) A damaged spring assembly (621) or piston (620) A missing or damaged second clutch housing ball check valve assembly (618) A damaged second clutch housing assembly (617)