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USA Standard Gear (ZG GM8.5-390) Ring & Pinion Gear Set for GM 8.5 Differential
✅ In stock
F
Grade
Analysis Confidence
100%
Price verified Sep 22, 2026 12:05 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- 💰The current price is slightly above the going rate for this product — worth watching for a drop.
- 🏷️The retail sticker price has been slashed by 53% — a steep markdown from the official listing.
- 📉This is the most affordable price seen in roughly three months — a solid near-term opportunity.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
8.46/22
Market Standing
1.4/20
Deal Strength
7/20
Momentum
4/10
📝 Product Overview
🏪 Sold by
Quick Performance Racing
🚚 Shipping
Free Shipping
Product Details
✓USA Standard ring and pinion sets are the right choice to add confidence to your install
✓USA Standard Gear offers a full line of ring and pinion sets for a variety of common and hard to find applications
✓Item model number : ZG GM8.5-390
✓This product is used in a 3.90 axle ratio
⚙️ Specifications
USA Standard Gear
USA Standard Gear
ZGGM8.5-390
16 pounds
16 x 12 x 6 inches
ZG GM8.5-390
Machined
ZG GM8.5-390
Manufacturer
USA Standard Gear
Brand
USA Standard Gear
Model
ZGGM8.5-390
Item Weight
16 pounds
Product Dimensions
16 x 12 x 6 inches
Item model number
ZG GM8.5-390
Exterior
Machined
