Installation Time
(approx) 4 Hours
Difficulty Level:
Light to Moderate mechanical skill required.
Installation Guides
No guide available for this part yet.
FREE 1 to 3-Day Delivery on Orders $149+ Details
USA Standard Gear 8.8-Inch 5-Lug Rear Axle; 31-Spline (99-04 Mustang, Excluding V6)
Item 435325
Shop Owners Save More!
Sign up for our dealer program
Product Information
Features, Description, Q&A, Specs & Installation
Features & Specs
- Fits Ford 8.8 In. Differential
- 31 Spline
- Length 30.75 In.
- Rear, 5 Lug
- Includes Axle Shaft, Wheel Bearing, Seal, Diff Cover Gasket, Studs, and Lug Nuts
- Advanced Heat-Treating Results in a Stronger, More Durable Axle
- Designed and Built to Meet or Exceed OE Quality
- Fits 99-04 Mustang, Excluding V6, Requires Upgraded 31 Spline Carrier Case
| Brand | USA Standard Gear |
| Spline Count | 31-Spline |
| Axle Placment | Rear |
Description
High-Performance Rear Axle. The USA Standard Gear 8.8-Inch 5-Lug Rear Axle with 31-Spline is engineered to replace or upgrade the rear axle assembly on compatible vehicles. It provides enhanced strength and durability, essential for handling increased power and improving vehicle reliability during demanding driving conditions. This axle set restores optimal function and supports longevity in rear-end drivetrain components.
Construction and Appearance. Manufactured using advanced alloys and heat-treating technologies, this kit ensures superior toughness and wear resistance. The components feature precision machining and a finish designed to protect against corrosion, delivering a robust and durable axle solution with a clean, professional appearance.
Installation. Installation requires moderate mechanical skill with no need for drilling or modifications when used with compatible components. The kit includes all necessary parts for a complete rear axle replacement or upgrade, facilitating a straightforward swap and quick return to operation.
Application. Specifically designed to fit 99-04 Mustang, Excluding V6.
USA Standard Gear ZA K630829
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Install Details & What's in the Box
Installation Info
What's in the Box
- (1) Rear Axle
4.7
Reviews of USA Standard Gear Drivetrain Products (46)
Questions & Answers
No questions about this product yet.
Ask the First Question
Will It Fit My Mustang
- Bullitt - 01
- Cobra - 99, 01, 03, 04
- Cobra R - 00
- GT - 99, 00, 01, 02, 03, 04
- Mach 1 - 03, 04
