LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1998 >> Forward Control 6.5 F >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Specifications Index
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Specifications Index

FORWARD CONTROL SPECIFICATIONS INDEX

System Specification/Procedure
Air Conditioning
Service A/C SYSTEM SPECIFICATIONS
Torque TORQUE SPECIFICATIONS
Battery
4.3L CAPACITIES
5.7L CAPACITIES
6.5L CAPACITIES
7.4L CAPACITIES
Brakes
Bleeding Sequence RR, LR, RF, LF
Disc Brakes DISC BRAKE SPECIFICATIONS
Drum Brakes DRUM BRAKE SPECIFICATIONS
Torque TORQUE SPECIFICATIONS
Charging
Generator See GENERATOR USAGE/AMP OUTPUT RATING table under DESCRIPTION
Torque TORQUE SPECIFICATIONS
Drive Belts
Adjustment BELT ADJUSTMENT
Belt Routing See appropriate illustration under SERPENTINE BELT ROUTING & ALIGNMENT -- TRUCKS
Engine Cooling
General Service Specifications COOLING SYSTEM SPECIFICATIONS
Radiator Cap Pressure 15 psi
Thermostat R & I
4.3L, 5.7L, 7.4L NA
6.5L THERMOSTAT
Water Pump R & I
4.3L, 5.7L, 7.4L WATER PUMP
6.5L WATER PUMP
Engine Mechanical
4.3L, 5.7L, 7.4L
Compression ENGINE COMPRESSION
Oil Pressure OIL PRESSURE
Overhaul ENGINE SPECIFICATIONS
Torque TORQUE SPECIFICATIONS
6.5L
Compression ENGINE COMPRESSION
Oil pressure Normal oil pressure is 6 psi (41 kPa) at idle and 30-43 psi (207-296 kPa) at 2000 RPM.
Overhaul ENGINE SPECIFICATIONS
Torque TORQUE SPECIFICATIONS
Fluid Specifications See FLUIDS under MAINTENANCE tab. From within Manager or Service Writer, click the "30/60/90 Interval" or "Maint." button.
Flywheel/Flex Plate/Drive PlateTorque
4.3L, 5.7L 74 Ft. Lbs. (100 N.m)
6.5L 65 Ft. Lbs. (90 N.m)
7.4L 66 Ft. Lbs. ( 90 N.m)
Fuel System
Pressure Specification
4.3L, 5.7L 60-66 psi (4.2-4.6 kg/cm2 )
7.4L 56-62 psi (4.0-4.4 kg/cm2 )
Fuel Pressure Test Procedure
4.3L FUEL SYSTEM PRESSURE TEST
5.7L FUEL SYSTEM PRESSURE TEST
6.5L FUEL SYSTEM PRESSURE TEST
7.4L FUEL SYSTEM PRESSURE TEST
Fuel Filter Location and R & I
4.3L IN-LINE FUEL FILTER REPLACEMENT
5.7L IN-LINE FUEL FILTER REPLACEMENT
6.5L FUEL MANAGER/FILTER ELEMENT
7.4L NA
Fuel Filter R & I Link
Ignition
Firing Order & Cylinder Identification
4.3L See FIRING ORDER & CYLINDER IDENTIFICATION
5.7L See FIRING ORDER & CYLINDER IDENTIFICATION
6.5L See FIRING ORDER & CYLINDER IDENTIFICATION
7.4L See FIRING ORDER & CYLINDER IDENTIFICATION
Ignition Wires (Resistance) 30,000 Ohms Maximum
Ignition Wires (Routing)
4.3L FIRING ORDER
5.7L FIRING ORDER
6.5L NA
7.4L FIRING ORDER
Spark Plug
4.3L
Type AC 41-932
Gap .045 In. (1.14 mm)
Torque 14 Ft. Lbs. (20 N.m)
Tighten spark plugs to 22 ft. lbs. (30 N.m) if using a NEW cylinder head.
5.7L
Type AC 41-932
Gap .060 In. (1.52 mm)
Torque 14 Ft. Lbs. (20 N.m)
Tighten spark plugs to 22 ft. lbs. (30 N.m) if using a NEW cylinder head.
7.4L
Type AC 41-932
Gap .060 In. (1.52 mm)
Torque 14 Ft. Lbs. (20 N.m)
Tighten spark plugs to 22 ft. lbs. (30 N.m) if using a NEW cylinder head.
Starting
Starter ON-VEHICLE TESTING
Torque TORQUE SPECIFICATIONS
Wheel Alignment
Adjustment Specifications WHEEL ALIGNMENT SPECIFICATIONS
Torque TORQUE SPECIFICATIONS
Wheel & Tire
Wheel Lug Nut Torque
With 8-Lug Dual Rear Wheels 140 Ft. Lbs. (190 N.m)
With 10-Lug Dual Rear Wheels Step 1 - 140 Ft. Lbs. (190 N.m)
Step 2 - 175 Ft. Lbs. (240 N.m)
With Single Rear Wheels 120 Ft. Lbs. (160 N.m)