GMC Jimmy 1970-1991 Suspension Specifications
Explore the complete suspension specifications for the 1970-1991 GMC Jimmy. This guide includes front and rear suspension details, alignment settings, and component measurements for maintenance, repair, and upgrades. Perfect for mechanics and enthusiasts.
Overview Specifications
This document provides detailed suspension specifications for the 1970-1991 GMC Jimmy. It is designed to assist enthusiasts, mechanics, and restorers in understanding the suspension system, its components, and key technical details. Use the search and navigation instructions to quickly locate specific information. The sections are organized to cover major aspects of the suspension system, including front and rear suspension types, dimensions, and maintenance tips.
How to Use
Use the search bar to find specific terms or components. Enter keywords like 'front suspension' or 'shock absorbers' to quickly locate relevant sections.
Scroll through the document or use the table of contents to jump to specific sections. Each section is divided into subsections for easy access to detailed information.
Key Specifications
Front Suspension Type
Independent with coil springs
Rear Suspension Type
Leaf spring with solid axle
Wheelbase
104-106 inches
Track Width (Front)
59 inches
Ground Clearance
8.5 inches
Available Specifications
Front Suspension
The front suspension of the 1970-1991 GMC Jimmy is a critical component for handling and ride quality. This section covers the type of suspension used, key components, and their specifications. Learn about the independent front suspension system, its design, and maintenance requirements.
Front Suspension
The front suspension of the 1970-1991 GMC Jimmy is a critical component for handling and ride quality. This section covers the type of suspension used, key components, and their specifications. Learn about the independent front suspension system, its design, and maintenance requirements.
Suspension Type
- Independent front suspension with coil springs
- Upper and lower control arms for stability
- Hydraulic shock absorbers for damping
- Stabilizer bar to reduce body roll
- Ball joints for smooth articulation
- Rubber bushings for noise reduction
Dimensions and Clearances
- Wheelbase: 104 inches (1970-1980), 106 inches (1981-1991)
- Track width: 59 inches (front)
- Ground clearance: 8.5 inches
- Spring rate: 250 lbs/inch (approximate)
- Shock absorber travel: 6 inches
- Bushing diameter: 1.5 inches
Rear Suspension
The rear suspension system of the GMC Jimmy is designed for durability and load-bearing capacity. This section provides details on the leaf spring setup, axle type, and other critical components. Understand the specifications and maintenance tips for optimal performance.
Rear Suspension
The rear suspension system of the GMC Jimmy is designed for durability and load-bearing capacity. This section provides details on the leaf spring setup, axle type, and other critical components. Understand the specifications and maintenance tips for optimal performance.
Suspension Type
- Leaf spring rear suspension
- Solid rear axle for strength
- Hydraulic shock absorbers
- U-bolts for securing leaf springs
- Rubber bushings for vibration damping
- Optional rear stabilizer bar (1981-1991)
Dimensions and Load Capacity
- Leaf spring length: 52 inches
- Axle type: Dana 44 (standard)
- Load capacity: 1,500 lbs (approximate)
- Shock absorber travel: 7 inches
- Spring rate: 300 lbs/inch (approximate)
- Bushing diameter: 1.75 inches
Steering and Alignment
Proper steering and alignment are essential for safe and efficient handling. This section covers the steering system, alignment specifications, and adjustments for the GMC Jimmy. Learn about the steering gear, tie rods, and alignment angles.
Steering and Alignment
Proper steering and alignment are essential for safe and efficient handling. This section covers the steering system, alignment specifications, and adjustments for the GMC Jimmy. Learn about the steering gear, tie rods, and alignment angles.
Steering System
- Recirculating ball steering gear
- Power steering optional (1975-1991)
- Tie rod ends for precise control
- Steering linkage for smooth operation
- Steering wheel diameter: 15 inches
- Turning radius: 40 feet
Alignment Specifications
- Caster angle: +2 to +4 degrees
- Camber angle: 0 to +0.5 degrees
- Toe-in: 1/8 inch
- Steering axis inclination: 7 degrees
- Thrust angle: 0 degrees
- Adjustable control arms for alignment
Search Specifications
Search by specification name, value, or description
Type to search through torque specifications. Results will appear below as you type.
Component Specifications
Overview
- Type
- Front and rear solid axle
- Configuration
- Leaf spring with shock absorbers
- Platform
- K5 Blazer/Jimmy platform
- Material
- Steel construction
- Location
- Front and rear undercarriage
Dimensions
- Front Track Width
- 65.5 inches (1664 mm)
- Rear Track Width
- 65.5 inches (1664 mm)
- Wheelbase
- 104 inches (2642 mm)
- Ground Clearance
- 8.5 inches (216 mm)
- Spring Length Front
- 52 inches (1321 mm)
- Spring Length Rear
- 56 inches (1422 mm)
- Shock ABSorber Length
- 22 inches (559 mm)
- Axle Diameter
- 3.5 inches (89 mm)
Materials
- Leaf Springs
- High-carbon steel
- Shock ABSorbers
- Steel body with hydraulic fluid
- Axle Housing
- Cast iron
- Bushings
- Rubber and polyurethane
- U-Bolts
- Grade 8 steel
Features
- Durability
-
- Heavy-duty leaf springs
- Reinforced axle housing
- Corrosion-resistant coating
- Performance
-
- Hydraulic shock absorbers
- Stable ride quality
- Off-road capability
- Adjustability
-
- Manual torsion bar adjustment
- Replaceable bushings
- Shock absorber mounting options
- Maintenance
-
- Grease fittings on suspension points
- Replaceable components
- Easy access for inspection
- Compatibility
-
- Fits 15-16 inch wheels
- Supports aftermarket upgrades
- Compatible with lift kits
Safety Features
- Structural integrity
-
- Reinforced axle housing
- High-strength u-bolts
- Stability
-
- Wide track width
- Balanced weight distribution
- Emergency Handling
-
- Shock absorbers with fail-safe design
- Leaf spring redundancy
Comfort Features
- Ride Quality
-
- Progressive-rate leaf springs
- Hydraulic shock damping
- Noise Reduction
-
- Rubber bushings
- Insulated mounting points
- Vibration Control
-
- Balanced axle assembly
- Shock absorber tuning
- Load Handling
-
- Heavy-duty spring capacity
- Stable under heavy loads
Accessories
- Upgrades
-
- Lift kits
- Heavy-duty shocks
- Polyurethane bushings
- Tools
-
- Spring compressors
- Torque wrenches
- Grease guns
- Protection
-
- Skid plates
- Axle guards
- Rust inhibitors
Maintenance
- Service interval
- Every 15,000 miles or 12 months
- Service Items
-
- Inspect leaf springs for cracks
- Check shock absorber condition
- Lubricate bushings and fittings
- Tighten u-bolts
- Inspect axle alignment
- Maintenance Notes
- Regularly clean undercarriage to prevent rust and debris buildup.
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Manufacturing defects
- Powertrain
- Miles: 60,000Years: 5Coverage: Axle and suspension components
- Corrosion
- Miles: 100,000Years: 7Coverage: Rust perforation
- Roadside Assistance
- Miles: 36,000Years: 3Coverage: Towing and emergency services
Production Details
- Manufacturer
- General Motors
- Manufacturing Process
-
- Forging of leaf springs
- Casting of axle housing
- Assembly line integration
- Quality Control
- Testing: Load testing, Durability testing, Alignment checksinspection: Visual inspection, Dimensional verification, Material certification
- Sustainability Practices
-
- Recycled steel usage
- Waste reduction in production
- Energy-efficient manufacturing
- Production Metrics
- Units Per Day: 500Defect Rate: 0.5%Lead Time: 2 weeks
Service Information for suspension Service
Maintenance and service requirements specific to this component
- Inspect leaf springs for wear
- Check shock absorber performance
- Lubricate all suspension points
- Tighten u-bolts and mounting hardware
- Inspect axle alignment
Ensure proper torque specifications are followed.
- Replace worn bushings
- Check for axle leaks
- Inspect suspension geometry
- Test shock absorber damping
- Verify spring alignment
Use manufacturer-recommended replacement parts.
- Replace shock absorbers
- Inspect and replace leaf springs if needed
- Check axle housing for cracks
- Perform full suspension alignment
- Test load capacity
Major service may require specialized tools.
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What suspension components are compatible with 1970-1991 GMC Jimmy models?
What suspension components are compatible with 1970-1991 GMC Jimmy models?
The 1970-1991 GMC Jimmy is compatible with a range of suspension components, including coil springs, leaf springs, shock absorbers, and control arms designed for the K5 Blazer platform. Ensure parts are specifically labeled for 1970-1991 GMC Jimmy or K5 Blazer models. Compatibility varies by year, so verify part numbers with manufacturers or suppliers before purchase.
Q2 What maintenance is required for the suspension system of a 1970-1991 GMC Jimmy?
What maintenance is required for the suspension system of a 1970-1991 GMC Jimmy?
Regular maintenance includes inspecting shock absorbers for leaks, checking leaf spring bushings for wear, and ensuring coil springs are not sagging. Lubricate suspension joints every 12,000 miles and tighten bolts to manufacturer specifications. Replace worn components promptly to avoid further damage and ensure optimal performance.
Q3 How do I replace the rear leaf springs on a 1970-1991 GMC Jimmy?
How do I replace the rear leaf springs on a 1970-1991 GMC Jimmy?
To replace rear leaf springs, safely lift the vehicle and secure it on jack stands. Remove the rear wheels, disconnect the shock absorbers, and unbolt the U-bolts securing the leaf springs. Install new leaf springs, ensuring proper alignment, and reattach all components. Torque bolts to factory specifications and test drive to confirm proper installation.
Q4 What should I do if my 1970-1991 GMC Jimmy has uneven suspension or handling issues?
What should I do if my 1970-1991 GMC Jimmy has uneven suspension or handling issues?
Uneven suspension or handling issues may stem from worn shocks, sagging springs, or misaligned components. Inspect shocks for leaks, measure spring height, and check for loose or damaged parts. Replace worn components and ensure proper alignment. If issues persist, consult a professional mechanic for further diagnosis.
Q5 How can I improve the off-road performance of my 1970-1991 GMC Jimmy's suspension?
How can I improve the off-road performance of my 1970-1991 GMC Jimmy's suspension?
Upgrade to heavy-duty shock absorbers, reinforced leaf springs, and a lift kit for improved ground clearance. Consider adding sway bar disconnects for better articulation. Ensure all components are properly installed and aligned. Regularly inspect and maintain the suspension system to sustain optimal off-road performance.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
1970-1991 GMC Jimmy Service Manual
Coming SoonComprehensive guide covering suspension system maintenance, repair, and troubleshooting for 1970-1991 GMC Jimmy models.
Suspension Technical Bulletin for 1970-1991 GMC Jimmy
Coming SoonTechnical service bulletin addressing common suspension issues and recommended solutions for 1970-1991 GMC Jimmy models.
1970-1991 GMC Jimmy Suspension Parts Catalog
Coming SoonCatalog listing OEM and aftermarket suspension parts compatible with 1970-1991 GMC Jimmy models.
About the Author
Expert automotive knowledge and experience
'/%3E%3Cpath d='M60 30a20 20 0 1 1 0 40 20 20 0 0 1 0-40zm0 45c16.5 0 30 7.5 30 16.8V100H30v-8.2c0-9.3 13.5-16.8 30-16.8z' fill='%23404040'/%3E%3C/svg%3E)
Diagnostic
Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.
Repair
Expert in both traditional mechanical repairs and modern vehicle systems.
Additional Expertise
Documentation
Created over 500 detailed repair guides and technical documents.
Training
Conducted technical training sessions and contributed to repair databases.
Certifications & Research
Certifications
- ASE Master Technician Certification
- Advanced Diagnostic Specialist
- Hybrid/Electric Vehicle Systems
- Performance Tuning Expert
Research & Community
Actively researches emerging technologies and contributes to automotive forums.
Legal Disclaimer
Important information about using this content
Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.
General Information
Warranty & Liability
The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.
We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.
Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.