Description

All upper tubular and lower boxed trailing arms use polyurethane bushings on both ends, while upper adjustable and lower tubular trailing arms use a spherical ball or rod end assembly on the chassis end to eliminate bushing bind, allowing the suspension to move smoother for better control. This keeps the tires planted firmly on the ground for improved traction and a more predictable, better handling car. For a long-lasting finish, tubular and boxed trailing arms are powder-coated gloss black, while the adjustable arms are zinc plated and anodized. Boxed Trailing Arms are constructed from 0.120'' wall cold rolled steel tubing for maximum strength and flex elimination. These trailing arms have fluted, greasable polyurethane bushings, which are superior to the stock rubber bushings. Tubular Trailing Arms are constructed from 1-1/4'' diameter, 0.120'' wall steel tubing which offers increased strength over other designs, but also have the added advantage of lighter weight. These trailing arms have fluted, greasable polyurethane bushings, which are superior to the stock rubber bushings. Heavy-Duty Adjustable Trailing Arms allow easy rear suspension adjustments for optimum handling and traction. Simply loosen the jam nuts and adjust the pinion angle without removing the arms from the vehicle. They replace soft OE differential bushings with polyurethane differential bushings, and they use a spherical ball or rod end assembly with UHMW polyethylene bushings on the chassis end to allow the rear suspension to move more freely and eliminate bushing bind. All parts sold in pairs.

Product Overview

All upper tubular and lower boxed trailing arms use polyurethane bushings on both ends, while upper adjustable and lower tubular trailing arms use a spherical ball or rod end assembly on the chassis end to eliminate bushing bind, allowing the suspension to move smoother for better control. This keeps the tires planted firmly on the ground for improved traction and a more predictable, better handling car. For a long-lasting finish, tubular and boxed trailing arms are powder-coated gloss black, while the adjustable arms are zinc plated and anodized. Boxed Trailing Arms are constructed from 0.120'' wall cold rolled steel tubing for maximum strength and flex elimination. These trailing arms have fluted, greasable polyurethane bushings, which are superior to the stock rubber bushings. Tubular Trailing Arms are constructed from 1-1/4'' diameter, 0.120'' wall steel tubing which offers increased strength over other designs, but also have the added advantage of lighter weight. These trailing arms have fluted, greasable polyurethane bushings, which are superior to the stock rubber bushings. Heavy-Duty Adjustable Trailing Arms allow easy rear suspension adjustments for optimum handling and traction. Simply loosen the jam nuts and adjust the pinion angle without removing the arms from the vehicle. They replace soft OE differential bushings with polyurethane differential bushings, and they use a spherical ball or rod end assembly with UHMW polyethylene bushings on the chassis end to allow the rear suspension to move more freely and eliminate bushing bind. All parts sold in pairs.

Features and Benefits

• Direct fit options for many popular GM, Ford & Mopars
• Adjustable arms offer easy wheelbase and pinion angle adjustment
• Easy, bolt-in install
• Made in the USA

Product Details

Brand:	QA1
Description:	QA1 78-96 GM B-Body Lower Boxed Trailing Arms (OE Length)
Manufacturer Part Number:	5203
Part Number:	qap5203
Prop 65 - Short Label:	WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov
Prop 65 Yes/No:	Yes
Title:	QA1 Suspension Trailing Arm 5203
UPC:	806990147325

Kit Options

This item is available as a full kit.
Select a kit option in the following table if you are looking for this item in a bundle form with all associated components.

Kit option/s:

Thumb	SKU	Kit Title
	qapDK21-GMB4	QA1 78-93 GM B-Body Level 1 Drag Kit 2.0 w/ Shocks (1x qap5203, 1x qap5252, 1x qap5254, 1x qap52894, 2x qapTD507, 2x qapTS801)
	qapDK22-GMB4	QA1 78-93 GM B-Body Level 2 Drag Kit 2.0 w/ Shocks (1x qap5203, 1x qap5252, 1x qap5254, 1x qap52894, 1x qap52918, 1x qap52920, 2x qap7888-109, 1x qapGD507-10350C, 1x qapRCK52379, 1x qapT115W)
	qapDK23-GMB4	QA1 Level 3 Full Vehicle Drag Racing Suspension Kits DK23-GMB4 Handling Packages, Racing, Coil Springs, Shocks/Struts, Control Arms, Rear Sway Bar, 0-2.000 in. Drop, Buick, Chevy, Olds, Kit
	qapDK31-GMB4	QA1 78-93 GM B-Body Level 1 Drag Kit 2.0 w/o Shocks (1x qap5203, 1x qap5252, 1x qap5254, 1x qap52894, 2x qap7888-109, 1x qapT115W)
	qapDK32-GMB4	QA1 78-93 GM B-Body Level 2 Drag Kit 2.0 w/o Shocks (1x qap5203, 1x qap5252, 1x qap5254, 1x qap52894, 1x qap52918, 1x qap52920, 2x qap7888-109, 1x qapT115W)
	qapDK33-GMB4	QA1 78-93 GM B-Body Level 3 Drag Kit 2.0 w/o Shocks (1x qap5203, 1x qap5252, 1x qap5254, 1x qap52894, 1x qap52918, 1x qap52920, 2x qap7888-109, 1x qapT121W)
	qapHK22-GMB4	QA1 Level 2 Full Vehicle Handling Suspension Kits HK22-GMB4 Packages, Handling, Coil Springs, Shocks/Struts, Sway Bars, Control Arms, Buick, Chevrolet, Oldsmobile, Pontiac, Kit
	qapHK23-GMB4	QA1 Level 3 Full Vehicle Handling Suspension Kits HK23-GMB4 HANDLING KIT LEVEL 3, GM B-BODY; 78-93 GM B-BODY, W/ SHOCKS
	qapHK32-GMB4	QA1 78-93 GM B-Body Level 2 Handling Kit 2.0 w/o Shocks (1x qap5203, 1x qap5252, 1x qap5254, 1x qap52718, 1x qap52720, 1x qap52862, 1x qap52894, 2x qap7888-109, 1x qapT115W)
	qapHK33-GMB4	QA1 78-93 GM B-Body Level 3 Handling Kit 2.0 w/o Shocks (1x qap5203, 1x qap52518, 1x qap5252, 1x qap52520, 1x qap5254, 1x qap52862, 1x qap52894, 2x qap7888-109, 1x qapT121W)

Data: v4.2 - Upd: 2026-10-15 16:42:44

Features

Specifications

Product Attributes - Brand

QA1

Product Attributes - Manufacturer's Part Number

5203

Product Attributes - Part Type

Control Arms

Product Attributes - Product Line

QA1 Rear Trailing Arms

Product Attributes - UPC

806990147325

Product Attributes - Control Arm Style

Boxed

Product Attributes - Control Arm Material

Steel

Product Attributes - Ball Joint Included

No

Product Attributes - Bushings Included

Yes

Product Attributes - Control Arm Color

Black

Product Attributes - Adjustable

No

Product Attributes - Hardware Included

No

Product Attributes - Bushing Material

Polyurethane

Product Attributes - Quantity

Sold as a pair.

Compatibility