For 8.5" 10-Bolt Chevy Posi Unit - 28 Spline Eaton-Style Limited-Slip Heavy Duty

Posi Unit for Chevy 8.5" 10-Bolt

This 28-spline Eaton-style limited-slip posi unit is a direct-fit traction upgrade for Chevy 8.5 inch 10-bolt rear ends, sending torque to both rear wheels instead of spinning just one.

Overview

This 28-spline posi unit is a limited-slip differential carrier built for Chevy 8.5 inch 10-bolt rear axles. The Eaton-style clutch design splits torque to both rear wheels under load for consistent straight-line traction. It is aimed at drivers running street, strip, or tow duty who want both tires planted instead of one.

Built For Performance

• Eaton-style clutch-type limited-slip carrier for Chevy 8.5 inch 10-bolt rear ends
• 28-spline side gear count to match factory 28-spline axles
• Heavy duty construction built for higher torque loads
• Posi traction design keeps both rear wheels driving under acceleration
• Fits the standard 8.5 inch 10-bolt housing diameter

Fits These Machines

• for Chevy cars and trucks running a factory 8.5 inch 10-bolt rear end
• for GM 8.5 inch 10-bolt axle housings with 28-spline axles

On-The-Job Use

• Street and strip cars needing more traction off the line
• Light trucks and vans used for towing or hauling
• Off-road builds that want both rear tires clawing for grip
• Repair or upgrade of a worn or open differential carrier

Specs At A Glance

Good To Know

Q: Do I need to re-shim when installing this posi unit? A: Yes, differential carrier installation normally requires checking and setting backlash and carrier preload. A: A shop with differential experience is recommended for a proper install.

Q: Will this work with my factory axles? A: It matches 28-spline axles found in Chevy 8.5 inch 10-bolt rear ends. A: Confirm your axle spline count and housing before ordering.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.