Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 32 (DRIVE AXLES)OVERHAULDIFFERENTIAL CASEINSPECTING DIFFERENTIAL CASE
1999 GMC Forward Control 5.7 R, Automatic
Inspecting Differential Case
1999 GMC Forward Control 5.7 R, AutomaticSECTION Inspecting Differential Case
WARNING: This page is about a different car, the 2003 Chevrolet Corvette and 2002 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
- Clean the differential case components in solvent. Inspect the components for the following: cracks or other damage, damage to threaded bolt holes, unusual wear, scoring, or grooves in the clutch pack area, and scored or damaged case side bearing mounting flanges.
- Clean the gears and shafts with solvent. Inspect the gears for the following:
- Chips or cracks
- Pitting
- Heat discoloration
- Unusual wear
- Excessive wear or scoring in the side gear pin bores
- Wear, grooves, or scoring on the side gear pin
- Scored or worn side gear washers
- Unusual wear or grooves on the output gear splines
- Damaged to the ring gear threaded bolt holes
- Damage to the ring gear vehicle speed sensor reluctor ring lobes
- Inspect the shafts for the following: unusual wear, grooved, worn, or damaged splines, damaged "C" clip grooves, and clutch Discs and Plates.
- Clean the discs and plates with solvent. Inspect the discs and plates for the following: unusual wear, scoring, or grooves on the separator plate friction surfaces, friction plates with uneven wear or worn friction material. If any one plate or disk in either the left or right pack show signs of wear or scoring replace the complete pack on both sides. Bent or warped plates or discs. Lay the plates and discs on a flat surface and inspect for warpage, worn, scored, or collapsed bellville washer, bearings and Races. See Figure and Figure .
- Inspect the bearing rollers and races for the following, pitting, scoring or grooves, and excessive wear or other damage.
- Inspect the bearing rollers and races for heat discoloration. Heat discoloration ranges from a faint yellow to a dark blue color. This discoloration may result from an overload or improper lubrication. Excessive heat causes softening of the rollers and races. Bearings or races with sign of heat discoloration must be replaced.
- Inspect for bent bearing cages. Inspect for damaged bearing cages. Inspect the left side cover output shaft bearing for worn or missing needle bearings.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.