Shocker 40K Square Gooseneck 5" Outer Sleeve & 4.5" Inner Stem Tube Wallace Coupler - Adjustable - Square 4.5" Straight Pin, 3" Wallace Coupler
$709.99 CAD
$1,161.97 save $451.98
or as low as $60/mo with flexible financing — 4, 6, or 12 months. Options at checkout.
SKU: SH-GN45P/WF-45SQ-STR-WF40-RAW
Checking availability…
The details that matter
Product overview
Complete weld on gooseneck tongue kit with outer and inner tube with 3" Wallace Forge gooseneck coupler. This heavy-duty weld-on gooseneck tongue kit is engineered for maximum strength and durability in demanding towing applications.
What’s included
- Includes weld-on square outer sleeve tube with set bolts & through pin, adjustable inner square stem with welded-on cast steel gooseneck Wallace Forge coupler for a 3" ball, sold as a complete set.
Full product description
Complete weld on gooseneck tongue kit with outer and inner tube with 3" Wallace Forge gooseneck coupler. This heavy-duty weld-on gooseneck tongue kit is engineered for maximum strength and durability in demanding towing applications.
Rated at 40,000 lbs., it includes a thick-wall square outer sleeve, an adjustable inner square stem, and a heavy-duty cast steel Wallace forge gooseneck coupler designed specifically for 3" gooseneck hitch balls. This complete assembly is ideal for new trailer builds or full gooseneck tongue replacements requiring extreme load capacity.
Built for professional fabrication and trailer manufacturing, both the inner stem and outer sleeve feature extra-thick wall steel construction to handle high tongue weights and heavy loads.
The adjustable inner tube stem allows precise trailer height setup, while the welded-on coupler provides a proven, secure connection for commercial, agricultural, and industrial gooseneck trailers. Professional welding is required for proper installation and rated performance. California Residents: Prop 65 Warning
All features & technical notes
Features
40,000 lbs. Rated Outer & Inner Tube Stem Gooseneck Tongue Kit: Designed exclusively for heavy-duty towing applications with a 3" gooseneck hitch ball. Rated at 40,000 lbs. gross trailer weight and 8,000 lbs. tongue weight.
Complete Weld-On Assembly Includes Outer Tube, Inner Stem & Wallace Coupler: Includes weld-on square outer sleeve tube with set bolts & through pin, adjustable inner square stem with welded-on cast steel gooseneck Wallace Forge coupler for a 3" ball, sold as a complete set.
Heavy-Duty Wallace-Style Cast Steel Coupler for 3" Ball: Traditional, proven coupler design delivers long-lasting strength and a secure ball connection for demanding trailer use. Thick-Wall Inner & Outer Square Tubing: Both the inner stem and outer sleeve are constructed from thick-wall steel to resist flex, fatigue, and long-term wear under extreme loads.
4 Adjustment Holes on Inner Square Stem with Gooseneck Coupler: Inner stem includes 4 height adjustment holes spaced 2-3/4" apart, allowing precise trailer leveling. 4" stem has 3/4" diameter holes & 4.5" stem has 1" diameter holes.
Reinforced Coupler-to-Stem Weld Area: Extra heavy-duty plating at the coupler connection ensures strong weld penetration and long-term durability. Outer Sleeve Options: Available with a 4.5" OD sleeve with 4" ID square or a 5" OD sleeve with 4.5" ID square.
Outer sleeve measures 20" tall and features a reinforced collar with two set bolts and jam nuts along with through pin with clip. Raw Steel Construction: Supplied in raw steel, ready to weld and finish to match your trailer build requirements.
Professional Welding Required: Professional installation is required to maintain proper strength, alignment, and weight rating. Built for Heavy-Duty Gooseneck Trailers: Ideal for flatbeds, dump trailers, livestock trailers, equipment haulers, race trailers, and other high-capacity gooseneck applications.
Sold as a Set - Includes Outer Sleeve Tube, Inner Stem with welded on Gooseneck Coupler: Includes complete outer sleeve tube with 2 set bolts with jam nuts, through pin with clip along with inner tube gooseneck stem & Wallace Forge coupler for 3" gooseneck ball.
Installation
Download installation guide (PDF)Not sure this fits your setup?
These take a minute and save a return.
$709.99 CAD
Still researching?
Skip the product wall — these are the four guides every buyer actually opens before they decide.
Installation Guide
Step-by-step videos for every Shocker family. What's in the box, what tools you need, and how long it takes.
Watch the installAir Pressure Setup
How to dial in air pressure by trailer weight so the ride is right the first time and the hitch lasts longer.
See psi by loadTowing Capacity Guide
Match GTW, tongue weight, and receiver size to your truck class so you don't over- or under-buy.
Read the guideConfigure Your Hitch
60-second fit quiz — answer a few questions about your truck and trailer, get a tailored recommendation.
Start the quiz
- 1-Year Manufacturer Warranty
- 60-Day Returns
- 20,000+ Customers
- Ships from Canada