Removal of 1957 Buick Dynaflow Transmission

  1. Hoist front and rear of car and rest it solidly on stands placed under frame. Frame side rail should be at least 20” above floor.
  2. Disconnect torque tube from torque ball and move rear axle back to disengage propeller shaft from universal joint.
  3. Remove converter housing cover.
  4. Turn flywheel until one converter drain plug can be loosened sufficiently to provide an air vent, then turn flywheel until opposite drain plug is straight down. Remove this plug and allow oil to drain from converter.
  5. Remove filler pipe from oil pan to drain oil from 1957 Buick Dynaflow transmission.
  6. Remove bolts to disconnect converter from flywheel.
  7. Disconnect and remove oil cooler pipes.
  8. Disconnect speedometer cable, disconnect shift rod from shift lever, and disconnect stator operating control rod from lever on high accumulator.
  9. Place 1957 Buick Dynaflow transmission jack or hoist in position and adjust it to securely support the 1957 Buick Dynaflow transmission in accordance with instructions for the equipment being used.
  10. Remove four bolts that attach the thrust plate to rear bearing retainer, then remove two nuts and plate which attach mounting pad to transmission support. See figure 2-41.
  11. Raise engine and 1957 Buick Dynaflow transmission just enough to relieve load on transmission support, remove bolts attaching each end of support to frame, then remove support and thrust plate as an assembly. NOTE: Shims may or may not be used to fill space between the 1957 Buick Dynaflow transmission support and frame. If shims are present note the number and location of shims so that they can be reinstalled in their original position.
  12. Place suitable jack under rear end of engine lower crankcase so that engine will be safely supported while 1957 Buick Dynaflow transmission is removed. CAUTION: Do not use bar with hooks placed over frame side rails because brake pipes on top of left side rail will be damaged.
  13. Lower the 1957 Buick Dynaflow transmission just enough so that converter housing bolts can be reached. With engine and transmission supported by the separate jacks, disconnect the converter housing from engine crankcase.
  14. Move 1957 Buick Dynaflow transmission rearward to disengage hub of converter pump cover from crankshaft, lower transmission and remove it from under car.

Installation of 1957 Buick Dynaflow Transmission

  1. Turn flywheel so that one hole for converter attaching bolt is straight up and wide flange is straight down.
  2. Raise 1957 Buick Dynaflow transmission into place with same equipment as used for removal. Align converter attaching bolt holes with holes in flywheel before moving transmission forward against cylinder crankcase. See step 17 under Section i. of paragraph 5-23 for proper alignment.
  3. Adjust lifting equipment so that converter housing meets the engine crankcase squarely and engages the two dowels. Then install all converter housing bolts with lockwashers. Tighten all bolts uniformly to 45-55 ft. lbs. torque.
  4. Raise transmission just enough to install 1957 Buick Dynaflow transmission support and thrust plate, installing shims in their original locations between support and frame. Attach mounting pad to support with plate and nuts, and attach thrust plate to bearing retainer with four bolts and lockwashers.
  5. Remove transmission hoist and engine support or jack.
  6. Check converter drain plugs for tightness, then install converter housing cover.
  7. Attach oil filler pipe to oil pan.
  8. Install oil cooler pipes.
  9. Connect torque tube to torque ball with bolts and lockwashers.
  10. Connect speedometer cable to driven gear sleeve and connect shift rod to shift lever on 1957 Buick Dynaflow transmission. Connect stator operating control rod to lever on high accumulator.
  11. Wipe all oil from outside of 1957 Buick Dynaflow transmission then lower car to floor.
  12. Tighten torque ball bolts (see par. 4-12).
  13. Fill transmission to proper level as described in paragraph 1-4.
  14. Check adjustment of control linkage (par. 5-12). Check adjustment of stator operating controls and throttle linkage (par. 3-9).
  15. Road test car for approximately 20 miles with frequent stops and starts as might be encountered in heavy traffic. A thorough road warm-up is desired.
  16. Place car on hoist and carefully examine the 1957 Buick Dynaflow transmission and all connections for oil leaks. Recheck oil level.



Preliminary Instructions

  1. Before starting disassembly of the 1957 Buick Dynaflow transmission it should be thoroughly cleaned externally to avoid getting dirt inside.
  2. Place 1957 Buick Dynaflow transmission on a CLEAN work bench and use CLEAN tools during disassembly and assembly. Provide CLEAN storage space for parts and units removed from 1957 Buick Dynaflow transmission.
  3. The 1957 Buick Dynaflow transmission contains parts which are ground and highly polished, therefore, parts should be kept separated to avoid nicking and burring surfaces.
  4. When disassembling 1957 Buick Dynaflow transmission carefully inspect all gaskets at times of removal. The imprint of parts on both sides of an old gasket will show whether a good seal was obtained. A poor imprint indicates a possible source of oil leakage due to gasket condition, looseness of bolts, or uneven surfaces of parts.
  5. None of the parts require forcing when disassembling or assembling 1957 Buick Dynaflow transmission. Use a rawhide or similar soft mallet to separate tight fitting cases-do not use a hard hammer.
  6. It is good practice to reassemble parts in the same relative position as they were originally assembled, however, parts must not be prick punched or filed for assembly identification. The wear pattern of the parts will usually indicate their original assembly positions.

Removal of 1957 Buick Dynaflow Converter and Housing

NOTE: This operation not required for removal of valve and servo body, universal joint, or rear bearing retainer.

  1. Remove both drain plugs from converter pump cover to drain any oil remaining in converter.
  2. Remove all nuts, plain washers, and bolts attaching cover to converter pump, then remove cover. Check the cover seal for damage or evidence of oil leakage before removing it from cover.
  3. Remove reverse band adjustment cover and gasket, using Removing Tool J 2655. Shift into “Parking” and pry up on reverse band operating lever with screwdriver to lock input shaft while removing the bolt, lockwasher, retaining washer and thrust washer from front end of input shaft. See figure 5-28. Remove bronze thrust washer from turbine hub.
    1957 Buick Turbine Retaining Washer and Thrust Washer

    1957 Buick Turbine Retaining Washer and Thrust Washer

  4. Insert screwdriver into a hole in the first turbine disk to aid in removing the twin turbine assembly from the input shaft.
  5. Install Tool J 5806 over input shaft with beveled end outward. Pull stator forward on reaction shaft, grasp thrust washer and spacers located behind the stator to retain all free wheeling parts in the stator, then slide the assembly forward upon the tool and remove from input shaft. See figure 5-29.