QA1
QA1 79-04 Ford Mustang Upper Adjustable Trailing Arms
* Images may be a representation and may not reflect the actual product.
Product Details
Trailing Arm - Rear - Upper - Tubular - Greasable - Adjustable - Polyurethane Bushings - Aluminum - Red Anodized - Ford Mustang 1979-2004 - Pair
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. Trailing arms are powder-coated gloss black for a long lasting finish. 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 has 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. Adjustable Tubular Lower Trailing Arms are offered in both aluminum and steel. These arms are the ultimate in weight savings and adjustability, and they feature QA1's premium self-sealing and self-lubricating X Series (heat treated chromoly steel) or A Series (aircraft aluminum) rod ends. Kits include (2) lower control arms with rod ends and jam nuts. All parts sold in pairs.
Upper adjustable trailing arms for 79-04 Mustang. Includes graphite/polyurethane bushings.
Adjustable arms offer easy wheelbase and pinion angle adjustment
QA1 79-04 Ford Mustang Upper Adjustable Trailing Arms
Direct fit options for many popular GM, Ford & Mopars
Trailing Arms, Upper, Adjustable 79-04 Mustang
QA1 Upper Trailing Arms
Suspension Trailing Arm
Easy, bolt-in install
Upper Trailing Arms
Made in the USA
Vehicle Fitment
Please verify year, make, model, and any notes before ordering.
- 1979-2004Ford Mustang
Product Specs
- Brand
- QA1
- Part Number
- 5255
- Catalog Number
- 001532998
- Product Line
- Trailing Arms
- Category
- Suspension
- Type
- Control Arms
- UPC / Barcode
- 806990064592
- Length
- 20.20 in
- Width
- 5.30 in
- Height
- 4.10 in
- Weight
- 7.45 lb
- Ship Alone
- No
- Air Restricted
- No
Shipping & Availability
This item is showing available inventory. Most in-stock performance parts ship quickly, but timing can vary by warehouse, vendor cut-off time, holidays, and carrier pickup.
Inventory shown: 3 available as of 6/4/2026.
Manufacturer warranty and return policy details will display here when available. Please refer to the manufacturers website for warranty information.
Reviews & Questions
Real product feedback when available, plus quick ways to get fitment or product help.
Other Popular Parts
The history of a company and its founder can go a long way in helping you decide if their product is one you can trust and QA1 Precision Products has been around for quite some time, starting in 1993 with the remarkably talented founder Jim Jordan, who began working in the power transmission field in the 1970’s. He was a true innovator who, besides being an expert on rod ends, was also responsible for a multiplicity of industry changing products and received multiple patents for sui generis ideas. He began QA1 in order to primarily develop rod ends and spherical bearings for the racing milieu and then with the acquisition of HAL SHOCKS in 1998 a new era in the company began with the shock absorber line putting QA1 on the road to becoming a leader in shock absorbers for a variety of performance driving applications. Then, the piece de resistance for the racing industry, the innovative shocks that you could re-valve and rebuild resulting in considerable time and money and this was all in 1999, the early history of the company. With the addition of the EDELBROCK suspension line Q1 increased its presence in the performance parts market with its own fabricated suspension components. QA1 now has facilities that are over eighty three thousand square feet in Lakeville, MN and you have to admit that is impressive resume’ for any company but particularly one in such a competitive market. The company’s success in a multiplicity of markets including shock absorbers, carbon fiber drive shafts, spherical bearings, rod ends, suspension and others too numerous to mention makes it one of the paramount companies in the performance industry. QA1 continues on its road to success today and to that end has surrounded themselves with a staff that can excel in every aspect of production including design and development, manufacturing and quality assurance and the company’s ability to use global sourcing for aluminum forging and impact extrusions makes it possible for them to accommodate you with premium quality American made products like their QA1 springs and shocks at an affordable price. There is a reason Inc. Magazine, a monthly publication focused on growing companies, named QA1 Precision Products, Inc. twice to its top annual 500 list as amongst the fastest growing privately held companies in the United States. One of those reasons is the extraordinary product line with things like the QA1 Complete Package - 24 Way Double Adjustable shock/spring package for your Firebird and Camaro available on the LMPERFORMANCE web site which allows for adjusting of the rebound and the compression independently affording you the optimum in adjustability. Or the QA1 Complete Front Struts / Coil-Over System for your Mustang that has an impressive ten full sweeps of rebound adjusting right from under your car’s hood making it easily accessible for that change from street to performance driving and it is available on the LMPERFORMANCE web site at a competitive price. LMPERFORMANCE has QA1 springs and QA1 shocks for sale to help you improve your car’s performance with high performance parts from the eminent manufacturer QA1 PRECISION PRODUCTS. See what a difference quality makes when you purchase QA1 precision products.
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Contact us with questions before ordering
California Residents: Prop 65 WARNING: This product MAY contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov
California Residents: TIRE WARNING: LMPerformance will not ship Tires to California.
Legal: Some or all of these parts may not comply with Federal, State, Province, and/or Local laws, ordinances, and regulations. Buyer takes all responsibility to ensure that any modifications or upgrades that have done conform to all applicable laws and regulations for road use, especially pertaining to safety and emissions. LMPerformance is not responsible for buyer not complying with Federal, State, Province, and/or Local laws, ordinances, and regulations. This policy shall be in force for all past, current, and future purchases from LMPerformance, Inc. LMPerformance will not ship ANY non-CARB compliant products to California where California requires products to be CARB certified such as Catalytic Converters and Induction Kits.
Free Shipping: Please note FREE Shipping refers to shipping within the contiguous continental US only. All other locations extra. Some items that require Truck Freight Delivery will require a Truck Freight surcharge. This surcharge is still a discounted shipping amount that is lower then the actual truck freight shipping charge that is charged to LMP. LMP will try to still give the lowest price possible for truck freight items.
Images: Images may be a representation and may not reflect the actual product. Examples would be SPEC stage 3 clutch kits which all use the same photo.
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Price Errors: In the event that a product has mistakenly been listed at an incorrect price, We reserve the right to refuse or cancel any orders placed for product listed at the incorrect price. We reserve the right to refuse or cancel any such orders whether or not the order has been confirmed and your account charged. If your payment type has already been charged for the purchase and your order is cancelled, a full refund to your orignial payment method in the amount of the incorrect price will be issued.
Special Order ITEMS: Some items are Special Ordered and may not be returnable, or even cancellable as they are going into production specifically because you ordered them. Special Ordered items can have a 5-35% cancelation fee.
Cancellations: Instock orders cannot be canceled due to our automated ordering & fast shipping system. To keep our prices low, all cancelations are subject to a 5% cancelation fee to cover transaction processing fees. We reserve the right to charge up to a 10% cancellation fee for cancelled orders due to merchant fees, Special Order fees and the cost of processing and shipping orders.When you request a cancellation of an order or a part, please note that it may take time for a manufacturer to cancel an order if the order is drop-shipped. We also have to confirm that the product has not shipped. If the product has shipped then this must be processed as a return.Also note that sometimes products ship more quickly than expected, so we recommend that you do not purchase alternative products until receiving final confirmation of the cancellation.
Returns: We cannot accept returns on parts that have been used or installed. No returns will be accepted after 30 days. All Returns must be in original packaging. Prior authorization must be given before any return can be made. Up to a 25% Restocking Fee may apply. Special Orders may be subject to Additional Manufacturer Restock Fees as well. Shipping cost will not be refunded.Hoods as well as PCM Programmers may not be returned unless defective and only for replacement. ALL returns must be first filed using our online form found here: https://www.lmperformance.com/returns.
Lost Order Claims All lost order/package claims must be made within 5 days of the shipping date or tracking information delivery date. All claimes made after this date will not be accepted due to Shipping companies policies of filing loss claims.
Damaged Items or Incorrect Items: Please contact us right away if your item has been damaged in shipping or are incorrect. Please note that we will ship replacement items the same method of shipping the order was originally placed for. LMPerformance can not ship packages overnight at our cost if the original shipping was not also overnight. Claims must be filed in order for replacement parts to be shipped.
Warranties:Any warranty claims must be placed with the manufacturer. All of the products sold by LMPerformance, regardless of the manufacturer, are designed for Racing and Performance applications. Many of our manufacturers offer NO WARRANTY on their products, either stated or implied, due to the unusual stresses placed on the parts and because we have no control over how they are installed and used. Many of these products are designed for off-road use only and are not legal for use on public highways. If you have a question about the warranty on a specific product, please e-mail or call us. Buyer assumes all risk and liability associated with these products.
Installation: We are not responsible for or any costs associated with the installation or the improper installation of any products. Purchaser assumes the risk associated with the installation of products. We, along with the manufacturer of each product are not responsible for any direct or indirect damage to the vehicle, personal, or costs incurred from the use of products.