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Yukon Gear & Axle ZG GM12P-390 Ring and Pinion Gear Set 3.90 Ratio GM 12-Bolt

(Chevrolet Camaro 1967-72, Impala 1964-72, Malibu 1964-67, Chevelle 1964-72, Caprice 1966-70, El Camino 1965-72, Monte Carlo 1970-72 + 7 more models)

Part of: Yukon Gear & Axle ZG Ring Pinion Set Ratio Ford

Other options in this family: Yukon Gear & Axle ZG GM8.2-355 Yukon Gear & Axle ZG GM8.5-373 Yukon Gear & Axle ZG GM8.5-411 Yukon Gear & Axle ZG GM9.5-488 Yukon Gear & Axle ZG GM8.5-342

Manufacturer

Picture for manufacturer Yukon Gear & Axle

Part Number

ZG GM12P-390
15 reviews
Sale Price

$279.67

1 left at this price

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Usually delivered within 2 days

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Product Details

The Yukon Gear & Axle ZG GM12P-390 is a USA Standard ring and pinion gear set engineered for GM 12-bolt passenger car differentials with a 3.90:1 gear ratio. This gear set is designed to meet or exceed OEM specifications, providing reliable performance for street driving, towing, or performance applications.

Key Features:

  • 3.90:1 gear ratio for improved acceleration and torque multiplication
  • Precision-manufactured to exceed original equipment standards
  • Rigorous quality control testing for dimensional accuracy and material integrity
  • Designed specifically for GM 12-bolt passenger car differentials
  • USA Standard Gear quality construction for long-lasting durability
  • Complete ring and pinion set for differential rebuild or ratio change

This gear set is ideal for enthusiasts looking to optimize their vehicle's performance characteristics. The 3.90 ratio provides excellent low-end torque and improved throttle response compared to higher (numerically lower) ratios, making it well-suited for street performance, acceleration improvements, or compensating for larger tire sizes.

Products specifications

Fits

Chevrolet Camaro 1967-72, Impala 1964-72, Malibu 1964-67, Chevelle 1964-72, Caprice 1966-70, El Camino 1965-72, Monte Carlo 1970-72, Nova 1969-72, Chevy II 1964-68, Bel Air 1964-72, Biscayne 1964-72; Pontiac GTO 1970-72 + 2 more models

Axle Type

GM 12 Bolt

Axle Type

GM 8.875 in. Car

Gear Ratio

3.9

Position

Rear

Prop 65

No

Hope it gets to me fast.

Speedy service

Awesome price and shipping time.

I was very happy with receiving it ASAP as I needed to fix my car last minute for an event. Thank you so much

quick, simple, and cheap, in other words awesome, can't wait for the item.

Cheapest price I found online

A week ago I ordered a H3RHG100C 1.4 lb Halotron fire extinguisher. I mentioned "a week ago" because that is how long it took from order to delivery across the U.S.!! Now that I look at the paperwork, it wasn't even a full week. Autoplicity is now my #1 parts supplier for my 2010 Camaro. They could not have been any better overall. Ordering, checkout, stock and shipping. All above and beyond my expectations Great site, great communication. A1 people.

So far all is good.

easy

Great so far. great prices

Great Prices and fast, fast shipping. I will definitely do business with them again.

My first order and I must say, very impressive! Awesome prices and super-fast shipping direct from the manufacturer. Couldn't ask for more! I will return.

Good price on my THU-A90275. Had to contact customer service...they were professional and eventually resolved my concern. Called over the phone and the guy told me he couldn't help me with a coupon/refund, but that I had to contact support via email (I guess the phone support and email support aren't one and the same). It took a couple emails, but eventually they refunded me what was due.

Easy to order...Excited to see the new part and hoping the shipping is quick.

Thank you

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