Description
A 3.90 gear ratio delivers the aggressive acceleration and throttle response you need for drag racing, road course competition, or street performance—without sacrificing highway cruising capability. This GM 10-bolt kit comes complete with everything required for installation, eliminating the guesswork of sourcing individual components. Whether you’re chasing ET improvements or maximizing mid-range power delivery, a properly geared differential is foundational to extracting real performance from your engine.
- 3.90 gear ratio
- 30 spline pinion
- GM 10-bolt housing
- 8.5-inch / 8.625-inch diameter
- 3 series construction
- Complete kit assembly
- Bolt-on installation
- MPN: 49-0034-1
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