Center Support Assemble

Special Tools

• J 23327:  Clutch Spring Compressor
• J 45127:  Center Support Removal Tool
• J 45136:  Seal Protector
• J 45140:  Seal Protector
• J 45145:  Piston Protector
• J 45688:  Piston Installer - Pusher
• J 46239-1:  Second Coast Clutch Outer Protector
• J 46239-2:  Second Coast Clutch Inner Protector
• J 46239-3:  Second Coast Clutch Pusher
• J 46240-1:  Seal Protector
• J 46240-2:  Seal Protector

For equivalent regional tools, refer to Special Tools .

Fig 1: Inspecting Center Support Components
Courtesy of GENERAL MOTORS CORP.
1. Inspect the center support components for the following:
   • Plugged fluid passages
   • Worn or damaged splines
   • Worn or damaged pistons
   • Worn or damaged clutch plates
2. Install J 46240-1:  seal protector (2), and J 45145:  piston protector (3) into the housing.
Fig 2: Identifying 2nd Clutch Piston Springs & Retainer
Courtesy of GENERAL MOTORS CORP.
3. Install the 2nd clutch piston (520).
4. Install the 2nd clutch piston spring (521) into the center support (518).
5. Use J 23327:  spring compressor to compress the 2nd clutch piston spring (521).
6. Install the 2nd clutch spring retainer ring (522) into the center support (518).
7. Remove J 23327:  spring compressor from the center support (518).
Fig 3: Identifying 2nd Clutch Plates
Courtesy of GENERAL MOTORS CORP.
8. Install the 2nd clutch apply plate (523) into the center support (518).
9. Install the 2nd clutch plates. Start by installing the 2nd clutch plate (524) with external splines. Alternate with the 2nd clutch plate (525) with internal splines. Refer to Clutch Plate Selection Specifications .
10. Install the 2nd clutch backing plate (526) into the center support (518).
11. Install the 2nd clutch backing plate retainer ring (527) into the center support (518).
Fig 4: Measuring 2nd Clutch Pack & Backing Plate
Courtesy of GENERAL MOTORS CORP.
12. Measure the distance between the 2nd clutch backing plate and the bottom of the gage bar. Measure three times in different locations on the backing plate. Record this as H1.
13. Apply 65 PSI (448.17 kPa) of air pressure to the specified port. Measure the distance between the 2nd clutch backing plate and the bottom of the gage bar. Measure three times in different locations on the backing plate. Record this as H2.
14. Subtract H2 from H1 this is the 2nd clutch pack travel. Refer to Clutch Piston Travel Specifications .
Fig 5: Installing 2nd Coast Clutch Piston
Courtesy of GENERAL MOTORS CORP.
15. Using J 46239-1:  outer protector (3), J 46239-2:  inner protector (2) and J 46239-3:  pusher (1), install the 2nd coast clutch piston (528).
Fig 6: Identifying 2nd Coast Clutch Spring & Retainer
Courtesy of GENERAL MOTORS CORP.
16. Install the 2nd coast clutch spring (529) into the center support (518).
17. Using J 23327:  spring compressor compress the 2nd coast clutch spring (529).
18. Install the 2nd coast clutch spring retainer (530) into the center support (518).
19. Remove J 23327:  spring compressor.
Fig 7: Identifying 2nd Coast Clutch Components
Courtesy of GENERAL MOTORS CORP.
20. Install the 2nd coast clutch spacer (531) into the center support (518).
21. Install the 2nd coast clutch plates. Starting with the 2nd coast clutch plate (532) with external splines. Alternate with the 2nd coast clutch plate (533) with internal splines. Refer to Clutch Plate Selection Specifications .
22. Install the 2nd coast clutch backing plate (534).
23. Install the 2nd coast clutch backing plate retainer ring (535).
Fig 8: Measuring 2nd Coast Clutch Backing Plate To Gage Bar
Courtesy of GENERAL MOTORS CORP.
24. Measure the distance between the 2nd coast clutch backing plate and the bottom of the gage bar. Measure three times in different locations on the backing plate. Record this as H1.
25. Apply 65 PSI (448.17 kPa) of air pressure to the specified port. Measure the distance between the 2nd coast clutch backing plate and the bottom of the gage bar. Measure three times in different locations on the backing plate. Record this as H2.
26. Subtract H2 from H1 this is the 2nd coast clutch pack travel. Refer to Clutch Piston Travel Specifications .
Fig 9: Installing Low & Reverse Clutch Piston Into Center Support
Courtesy of GENERAL MOTORS CORP.
27. Use the J 46240-1:  seal protector (2), J 45688:  pusher (1) and the J 45136:  seal protector (3) to install the low and reverse clutch piston (517) into the center support (518).
Fig 10: Identifying Low & Reverse Clutch Spring & Retainer Ring
Courtesy of GENERAL MOTORS CORP.
28. Use J 23327:  spring compressor, compress the low and reverse clutch piston spring (516).
29. Install the low and reverse clutch spring retainer ring (515) into the center support (518).
Fig 11: Identifying Low & Reverse Apply Plates
Courtesy of GENERAL MOTORS CORP.
30. Install the low and reverse apply plate (514) into the center support (518).
31. Install the low and reverse clutch plates. Start with the low and reverse clutch plate (513) with external splines. Alternate with the low and reverse clutch plate (512) with internal splines. Refer to Clutch Plate Selection Specifications .
32. Install the low and reverse clutch backing plate (511) and the retainer ring (510) into the center support (518).
Fig 12: Measuring Low & Reverse Clutch Backing Plate To Gage Bar
Courtesy of GENERAL MOTORS CORP.
33. Measure the distance between the low and reverse clutch backing plate and the bottom of the gage bar. Measure three times in different locations on the backing plate. Record this as H1.
34. Apply 65 PSI (448.17 kPa) of air pressure to the specified port. Measure the distance between the low and reverse clutch backing plate and the bottom of the gage bar. Measure three times in different locations on the backing plate. Record this as H2.
35. Subtract H2 from H1 this is the low reverse clutch pack travel. Refer to Clutch Piston Travel Specifications .
Fig 13: Identifying Center Support With J 45127
Courtesy of GENERAL MOTORS CORP.
36. Using J 45127:  removal tool install the center support (18) into the case.