Installation Instructions for GMC Sierra & Chevrolet Silverado 2500HD/3500/3500HD
(Classic & New Body Models - Requires Factory Bumper & Brackets)

Part Numbers:

• 75550
• 44577
• 87442

Tools Required:

• Wrenches: 3/4", 21mm, 22mm
• Drill Bits: None

Wiring Access Location:

• PU3

Step-by-Step Instructions:

1. Remove Existing Fasteners:

   • Remove the existing M14 bolts from the end of each truck frame rail.

2. Position the Hitch:

   • Lift the hitch into position, aligning the rearmost slots on the hitch with the existing weldnuts in the truck frame.

3. Install Spacers (if needed):

   • If there are variations in bumper height, install 1–4 flat washers (9/16”) per side between the hitch and bumper attachment points as needed.

4. Secure M14 Bolts:

   • Install the new M14 bolts through the hitch into the weldnuts in the truck frame and the step bumper.

5. Install Remaining Fasteners:

   • Secure the remaining fasteners as shown in the diagram.

6. Torque Specifications:

   • Tighten all 1/2"-13 GR5 fasteners to 75 lb-ft (102 N·m).
   • Tighten all M14 CL10.9 fasteners to 115 lb-ft (156 N·m).

Hardware List:

• (4) M14 x 2.00 x 40mm CL10.9 Hex Bolts
• (4) 9/16" Lock Washers
• (2) 1/2"-13 x 1-3/4" Carriage Bolts
• (12) 9/16" Flat Washers
• (2) 1/2" Hex Nuts
• (2) 1/2" Conical Washers
• (2) 1/4” x 1-1/2” x 3” Spacer Blocks

Safety Notes:

• Check the hitch frequently to ensure all fasteners and the ball are properly tightened.
• If the hitch is removed, plug all holes in the trunk pan or body panels to prevent water and exhaust fumes from entering.
• Replace any damaged hitch or ball immediately.
• Follow safety precautions when working beneath the vehicle, and wear eye protection.
• Do not cut access or attachment holes with a torch.

Specifications:

• Hitch Type and Weight Ratings:
  • Weight Carrying (Ball Mount): Max Trailer Weight 6,000 lbs (2,724 kg), Max Tongue Weight 600 lbs (272 kg).
  • Weight Distributing: Max Trailer Weight 11,000 lbs (4,990 kg), Max Tongue Weight 1,100 lbs (499 kg).
• Complies with safety specifications and requirements for connecting devices and towing systems of the State of New York, V.E.S.C. Regulation V-5, and SAE J684.

Additional Notes:

• Factory-installed steel step bumper and bumper brackets must be used with this hitch.

Installation Instructions for Vehicles (Generic)
(Classic & New Body Models - Requires Factory Bumper & Brackets)

Part Numbers:

• 75550
• 44577
• 87442

Tools Required:

• Wrenches: 3/4", 21mm, 22mm
• Drill Bits: None

Wiring Access Location:

• PU3

Step-by-Step Instructions:

1. Remove Existing Fasteners:

   • Remove the existing M14 bolts from the end of each truck frame rail.

2. Position the Hitch:

   • Lift the hitch into position, aligning the rearmost slots on the hitch with the existing weldnuts in the truck frame.

3. Install Spacers (if needed):

   • If there are variations in bumper height, install 1–4 flat washers (9/16”) per side between the hitch and bumper attachment points as needed.

4. Secure M14 Bolts:

   • Install the new M14 bolts through the hitch into the weldnuts in the truck frame and the step bumper.

5. Install Remaining Fasteners:

   • Secure the remaining fasteners as shown in the diagram.

6. Torque Specifications:

   • Tighten all 1/2"-13 GR5 fasteners to 75 lb-ft (102 N·m).
   • Tighten all M14 CL10.9 fasteners to 115 lb-ft (156 N·m).

Hardware List:

• (4) M14 x 2.00 x 40mm CL10.9 Hex Bolts
• (4) 9/16" Lock Washers
• (2) 1/2"-13 x 1-3/4" Carriage Bolts
• (12) 9/16" Flat Washers
• (2) 1/2" Hex Nuts
• (2) 1/2" Conical Washers
• (2) 1/4” x 1-1/2” x 3” Spacer Blocks

Safety Notes:

• Check the hitch frequently to ensure all fasteners and the ball are properly tightened.
• If the hitch is removed, plug all holes in the trunk pan or body panels to prevent water and exhaust fumes from entering.
• Replace any damaged hitch or ball immediately.
• Follow all safety precautions when working beneath the vehicle, and wear eye protection.
• Do not cut access or attachment holes with a torch.

Warranty Information:

• For complete warranty instructions, please download the full installation PDF.

Specifications:

• Hitch Type and Weight Ratings:
  • Weight Carrying (Ball Mount): Max Trailer Weight 6,000 lbs (2,724 kg), Max Tongue Weight 600 lbs (272 kg).
  • Weight Distributing: Max Trailer Weight 11,000 lbs (4,990 kg), Max Tongue Weight 1,100 lbs (499 kg).
• Complies with safety specifications and requirements for connecting devices and towing systems.

Attention:

Factory-installed steel step bumper and bumper brackets must be used with this hitch.

Technical Support:

For technical support and assistance, our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.