UMI Performance 3665-B 1" Solid Rear Sway Bar for 65-70 B-Body/Impala/Bel-Air

Vehicle Fitment

• 1965-1970 Chevrolet Impala / Bel Air / Biscayne / Caprice (B-Body)

Fitment Notes

• Fits 1965-1970 GM B-Body full-size vehicles with rear leaf spring suspension
• Compatible with factory lower control arms that have factory sway bar mounting holes
• Also compatible with UMI Performance lower control arms (Part #3655)
• Designed for use ONLY with stock GM rear axle housings
• Does NOT fit vehicles with Ford 9" rear axle swaps - will interfere
• Does NOT fit station wagon models
• Professional installation recommended

Features

• 1" solid high carbon steel construction for maximum strength
• Heat treated and formed as one piece for optimal performance
• Reduces body roll and understeer for improved cornering
• Creates more balanced suspension characteristics
• Machine-guided DOM tubing bends maintain correct geometry and material strength
• Tiger Dry Lac powder coat finish for long-lasting durability
• North American sourced and milled steel
• CNC machined and laser cut components
• Direct bolt-on installation with included hardware
• Designed, engineered, and manufactured in the USA

Specifications

• Part Number: 3665-B
• Brand: UMI Performance
• Type: Rear Sway Bar
• Position: Rear
• Diameter: 1" Solid
• Material: High Carbon Steel
• Construction: Heat Treated, One-Piece Solid Design
• Finish: Black Powder Coat (Tiger Dry Lac)
• Hardware Grade: Grade 8
• Quantity: Kit
• Country of Origin: USA (Philipsburg, Pennsylvania)

Included Components

• (1) UMI Performance 1" Solid Rear Sway Bar
• Grade 8 Mounting Hardware

Product Description

The UMI Performance 3665-B is a heavy-duty 1-inch solid rear sway bar engineered for 1965-1970 Chevrolet B-Body full-size vehicles including the Impala, Bel Air, Biscayne, and Caprice. Designed to significantly reduce body roll and understeer, this sway bar transforms cornering capabilities and creates a more balanced, confidence-inspiring suspension. Manufactured from heat-treated high carbon steel and formed as a single piece, the bar delivers maximum strength and consistent performance. Machine-guided DOM tubing bends maintain correct geometry while preserving material integrity, and the durable Tiger Dry Lac black powder coat finish provides long-lasting protection. The kit includes all Grade 8 hardware for complete installation and bolts directly to factory lower control arms equipped with sway bar mounting holes or UMI Performance #3655 aftermarket control arms. Please note this sway bar is designed exclusively for stock GM rear axle housings and will not clear Ford 9-inch axle conversions. Proudly designed, engineered, and manufactured in Philipsburg, Pennsylvania using North American sourced steel.