GMC T Series 1994 Repair Manual page 789

3. Synchronizer sleeves for:
• A sliding fit on the synchronizer hubs and for
the hubs to have a force fit on the mainshaft
splines. Replace the hub(s) if they do not
require a force fit on the mainshaft.
4. Synchronizer springs and keys for:
• Damage.
5. Synchronizer rings for:
• Excess wear.
6. Synchronizer clutching teeth for:
• Wear.
• Scuffed.
• Nicked.
• Burred or broken teeth.
7. Speed gear clutching cones for:
• Synchronizer ring metal transfer.
8. All gear teeth for:
• Excess wear.
— The black phosphate coating will develop
wear patterns. This is a normal condition.
9. Bearings and bearing surfaces for:
• Nicks.
• Burrs.
• Bent cages.
• Wear.
10. Lubricate all bearings and check for rough rotation.
• If scuffed, nicked, burred, scoring, or synchro­
nizer ring metal transfer conditions cannot be
removed with a soft stone or crocus cloth,
replace the com ponent and inspect mating
parts.
• Lubricate all components as assembly progres­
ses. Use lubricant 5W-30 GM P/N 1052931 or
equivalent.
COUNTERSHAFT
Clean (Figure 31)
• All parts in a suitable solvent and air dry.
Inspect (Figure 31)
1. Shaft (53) for cracks. Replace if these conditions
exist.
2. Gear teeth (53) for scuffed, nicked, burred, broken
teeth, or high spots (a small shiny spot on the gear
teeth mating surface) that could cause gear noise.
3. Bearings (35) for roughness of rotation, burred, or
pitted condition. Replace if these conditions exist.
4. Bearing races (202) for scoring, wear, or overheat­
ing.
• If scuffed, nicked, or burred conditions cannot
be removed with a soft stone or crocus cloth,
replace the component.
• Fifth gear CANNOT be pressed off the counter­
shaft assembly (53). Replace as an assembly
only.
REVERSE IDLER GEAR
Clean
• All parts in a suitable solvent and air dry.
I?
Inspect
1.G ear teeth for scuffed, nicked, burred, broken
teeth, or high spots (a small shiny spot on the gear
teeth mating surface) that could cause gear noise.
2. Bearing assembly for roughness of rotation, burred,
or pitted condition and cage damage. Replace if
these conditions exist
3. Shaft, for scoring, wear, or overheating.
• If scuffed, nicked or burred conditions cannot
be removed with a soft stone or crocus cloth,
replace the component.
FRONT AND REAR HOUSINGS
Inspect
1. Bearing race bore, for wear, scratches, or grooves:
if counter shaft bearing race bore is worn or dam­
aged the rear housing MUST be replaced.
2. Bushings, for scores, burrs, roundness, or evidence
of overheating.
Important
• O utput shaft bushing cannot be serviced.
Replace the rear housing if the bushing is worn
or damaged (2WD models only).
3. Case for cracks, threaded opening for damaged
threads, m ounting faces for nicks, burrs, or
scratches; if case is cracked, it must be replaced.
4. Machined mating surfaces for flatness. Check with
a straight edge.
Important
• If scratches, grooves, or scoring cannot be
removed with a soft stone or crocus cloth,
replace the component.
• Clean up damaged threads with correct size
tap.