2000 Chevy Impala Hard Shifting

Tiny
JASONSTULTS
  • MEMBER
  • 2000 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 16,500 MILES
Hello, I have a 2000 impala 3.8 liter 4t65e transmission and I am having shifting problems from 1st to second gear. At first it did it rarely and it is getting worse. I myself have replaced the pressure control solenoid but it seems like the problem comes more when the weather is hot and/or the engine temp is hot. Did I need to reset the trouble codes after the repair and how, would that make a difference? Also, should I have replaced the 1-2 and 3-4 shift solenoids as well. Do you think it could be because of the fluid not being cooled properly? Worn clutch pack? I really appreciate your response. This car is driving me crazy.
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Saturday, February 27th, 2010 AT 12:11 AM

3 Replies

Tiny
FACTORYJACK
  • EXPERT
Are you getting trouble codes, and what are they? You replaced the pressure control solenoid, but that may not have been the source of the fault.
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Saturday, February 27th, 2010 AT 1:58 AM
Tiny
JASONSTULTS
  • MEMBER
No trouble codes. No check engine light is coming on at all but I know there is a serious problem.
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Saturday, February 27th, 2010 AT 12:18 PM
Tiny
FACTORYJACK
  • EXPERT
It is a firm or harsh shift from first to second only? The fact that it occurs warm could be sticking or binding in the valve body after metal expansion or warpage is more influenced. I will include the diagnostic info for 1-2 shift feel fault possibilities.
Harsh or Soft 1-2 Shift Feel
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)
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Sunday, February 28th, 2010 AT 10:30 AM

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