Yukon YG F9-350 Ring & Pinion Gear Set 3.50 for Ford 9 Inch 28-Spline Drop-Out

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Product Specification:

SKU:YUKYG F9-350

MPN: YG F9-350

UPC: 883584241058

Weight: 19.3 lb

Inventory: 2

Type: Final Drive Gears

Vehicle Fitment

1957-1979 Ford F-100 (Ford 9" Drop-Out Rear Differential)
1975-1986 Ford F-150 (Ford 9" Drop-Out Rear Differential)
1961-1987 Ford E-150 / E-100 Econoline (Ford 9" Drop-Out Rear Differential)
1966-1986 Ford Bronco (Ford 9" Drop-Out Rear Differential)
1957-1979 Ford Ranchero (Ford 9" Drop-Out Rear Differential)
1965-1973 Ford Mustang / Mercury Cougar (Ford 9" Drop-Out Rear Differential)
1962-1971 Ford Fairlane / Ford Torino (Ford 9" Drop-Out Rear Differential)
1969-1977 Ford Galaxie / Ford LTD (Ford 9" Drop-Out Rear Differential)
1963-1977 Lincoln Continental / Lincoln Mark Series (Ford 9" Drop-Out Rear Differential)
1960-1971 Ford Falcon / Ford Maverick (Ford 9" Drop-Out Rear Differential)
1966-1977 Ford Thunderbird (Ford 9" Drop-Out Rear Differential)
Aftermarket Ford 9" housings (race, street rod, and custom swap applications - universal fitment)

Fitment Notes

Fits all Ford 9" (9-inch) drop-out / third-member style rear differentials - does not fit the Ford 8", 8.8", or 9.75" axles
28-spline pinion - compatible with 28-spline and 31-spline Ford 9" carrier configurations; confirm your carrier spline count before ordering
The Ford 9" is a semi-universal application - this gear set fits any OEM or aftermarket Ford 9" housing regardless of vehicle, making it suitable for restorations, street rods, race builds, and axle swaps
Ford 9" ring and pinion sets are accessed via the removable third member (drop-out / pumpkin) - no rear cover removal required
Professional installation is strongly recommended - proper gear setup requires specialized tools and precise preload, backlash, and contact pattern verification

Features

High-grade steel construction in both ring and pinion for exceptional durability across street, strip, and off-road use
Precision-engineered gear tooth surface finish reduces friction and heat under high-torque and sustained load conditions
Built to OEM dimensional tolerances for accurate drop-in fit within any Ford 9" third-member housing
Advanced heat-treating process hardens gear surfaces for improved shear strength and long-term wear resistance
Validated through two in-house Yukon quality labs for dimensional accuracy and metallurgical integrity
3.50 ratio delivers a well-rounded balance of low-end torque and highway cruising efficiency - a popular OEM and street performance ratio for the Ford 9"
Drop-out third-member design allows full bench setup and easy ratio changes without removing the axle housing
Backed by Yukon's Y.E.S. Plan - lifetime no-questions-asked coverage for as long as you own the vehicle

Specifications

Part Number: YG F9-350
Gear Ratio: 3.50
Ring Gear Diameter: 9.00"
Ring Gear Bolt Count: 10
Pinion Spline Count: 28
Differential Application: Ford 9" Drop-Out (Third Member) Rear
Position: Rear Axle

Included Components

1x Ring Gear
1x Pinion Gear

Product Description

The Yukon YG F9-350 is a high-performance ring and pinion gear set built for the iconic Ford 9-inch drop-out rear differential. Produced from 1957 through 1986 and still one of the most widely used and respected axle platforms in the restoration and performance market, the Ford 9" is renowned for its removable third-member design, enormous gear ratio selection, and proven strength across virtually every application. The 3.50 ratio was one of the most commonly installed factory ratios in Ford trucks, muscle cars, and SUVs of the era - making this gear set ideal for OEM-correct restorations as well as street performance builds that require a moderate numerically higher ratio.

Yukon engineers this gear set using high-grade steel with a precision-finished tooth profile that minimizes friction and heat. Advanced heat-treating further hardens the gear surfaces for improved durability and shear resistance under sustained load. Every set is built to OEM dimensional specs for an accurate, drop-in fit within any Ford 9" third-member housing - whether it's an original factory unit from a classic Mustang, F-100, Bronco, or Ranchero, or a modern aftermarket housing used in a custom street rod or swap build.

This gear set features a 28-spline pinion and 10-bolt ring gear, compatible with the full range of Ford 9" carrier configurations. Because the Ford 9" uses a drop-out (third-member) design, the entire gear assembly can be set up on a workbench before installation - a significant advantage for builders who need to swap ratios or perform differential work efficiently. Professional installation with proper gear setup tools is strongly recommended. Pair with a compatible Yukon master overhaul kit for all necessary bearings, seals, and hardware to complete the rebuild.