Product guide

USA Standard Gear ZGC8.0-390 Ring and Pinion Set, 3.90 Ratio

USA Standard Gear ZGC8.0-390 is a standard-rotation ring and pinion set listed for a Chrysler 8-inch differential with a 3.90 axle ratio. Confirm the differential and axle application before ordering, since fitment depends on the specific vehicle setup.

At a glance

Listed for a Chrysler 8-inch differential and 3.90 axle ratio.
Described by the manufacturer as a standard-rotation gear set.
Manufacturer states a standard one-year warranty against defects on its ring and pinion sets.

Price

$219.90Save 59%

Reference price: ~~$532.89~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

The specified differential application and 3.90 ratio make it straightforward to screen against a matching axle setup.
Standard rotation is stated in the listing, helping buyers compare it with their required gear configuration.

Technical specifications

7 specifications

Identity and application
Brand	USA Standard Gear
Model	ZGC8.0-390
Differential application	Chrysler 8"
Axle ratio	3.90
Rotation	standard rotation

Dimensions and installation
Dimensions listed	12 x 13 x 3 inches
Weight listed	12.9 pounds

What to know before buying

Confirm that the vehicle has the Chrysler 8-inch differential and requires a 3.90 ratio and standard rotation. The listed dimensions and weight describe the item, not a fitment guarantee.

Who is it for?

A good fit for

Buyers replacing gears in a confirmed Chrysler 8-inch differential that requires a 3.90 axle ratio and standard rotation.
Installers who have verified the axle application and gear configuration before ordering.

Less suited to

Buyers whose differential type, required ratio, or rotation has not been confirmed.
Applications requiring a different differential or axle ratio.

Frequently asked questions

What differential is this gear set listed for?

The listing specifies a Chrysler 8-inch differential. Confirm the exact axle application before buying.

What axle ratio does this set provide?

The listing identifies a 3.90 axle ratio.

Is this a standard-rotation set?

Yes. The listing describes it as a standard-rotation ring and pinion set.

What warranty is stated?

The manufacturer says its ring and pinion sets have a standard one-year warranty against defects. Check the warranty terms for this specific purchase.