Reverse Input Clutch Backing Plate Selection - GMC T Series 1994 Repair Manual

|h^h| Assemble
Figures 78, 79,81,82 and 83
1. Inner and outer seals (608) on the piston.
• Lips must face away from the hub as
shown.
• Lubricate with transmission fluid.
2. Piston (607) into the housing and drum
assembly.
• Use an 8 mm feeler gage to position the lip
seals.
• Use care not to damage the seals.
3. Spring assembly (609).
• L arge opening in the assem bly goes
towards the piston.
4. Install J 23327-1 and J 25018-A.
A. Compress the spring assembly.
B. Install the retainer ring (610).
5. Belleville steel clutch plate (611).
6. Clutch plates (612). (4 steel and 4 composition
plates required).
• S tart w ith a steel and alternate w ith
composition.
7. Backing plate (613).
• Chamfered side up
8. Retaining ring (614).

Reverse Input Clutch Backing Plate Selection

Figures 81,82 and 83
|^ |] Measure
1. With the reverse input clutch fully assembled,
apply an evenly distributed load to the clutch
pack in the direction shown in Figure 81.
Medium pressure (approximately 89 N or 20
lbs.) on the backing plate applied by hand on
five evenly distributed points will obtain the
backing plate travel for measurement.
NOTICE:
Excessive pressure will distort the
B elleville plate resu ltin g in an inaccurate
measurement.
2. Using a feeler gage, measure between the snap
ring and the backing plate. Backing plate travel
should be 1.02 to 1.94 mm (0.040 to 0.076
inch).
3. Select the proper backing plate to obtain the
specified travel.
REVERSE INPUT CLUTCH
BELLEVILLE PLATE
FLAT STEEL
CLUTCH PLATE
COMPOSITION FACED
CLUTCH PLATE
BACKING PLATE
Figure 82 Reverse Input Clutch Plate Chart
REVERSE INPUT CLUTCH
BACKING PLATE SELECTION
ALL MODELS
01
BACKING PLATE TRAVEL =
PLATE THICKNESS
7.249m m - 7.409m m
(.285" - .292")
6.678m m - 6.519m m
(.263" - .257")
5.947m m - 5.787m m
(.234" - .228")
NO. THICKNESS
2.311m m (.091")
1
2.210m m (.087")
2.045m m (0.81")
4
1.892m m (0.75")
1.880m m (.074")
4
1.730m m (.068")
1
SELECTIVE
RH0177-4L60-E
1.02m m - 1.94m m
{ Q M .
^
IDENTIFICATION
A
RH0178-4L60-E