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S.A. Gear 78420 Dual Idler Gear Drive Ford 302 351W

(Ford F-150 1975-96, Mustang 1969-73, 1979-95, Explorer 1996-2001, F-250 1969, 1972-74, 1977-96, Bronco 1968, 1975-77, 1980-96 + 54 more models)

Manufacturer

Picture for manufacturer S.A. Gear

Part Number

78420
8 reviews
Sale Price

$169.52

1 left at this price

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Usually delivered within 2 days

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No Hassle Returns

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Live-in-stock inventory

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Fitment guaranteed

Fitment guaranteed

Product Details

The S.A. Gear 78420 is a dual idler gear drive system designed to replace the timing chain on Ford small block 302 and 351W engines from late 1972 through 2002. Unlike conventional timing chains that can stretch and wear over time, this precision gear drive delivers consistent, maintenance-free timing for high-performance and racing applications.

Key Features:

  • Dual idler gear configuration for enhanced stability and precision timing
  • Billet steel gears that are heat-treated for maximum durability
  • Offset bushings allow for cam indexing and timing adjustments
  • Noisy version (audible gear whine during operation)
  • Designed to fit under most stock timing covers with occasional minor clearancing
  • Includes cam button and SAE 660 bronze thrust ring
  • Eliminates timing chain stretch for consistent valve timing

This gear drive set is ideal for performance street engines, muscle car restorations, and racing applications where precise timing is critical. The dual idler design provides superior stability compared to single idler systems. Note that this is the noisy version and will produce an audible gear whine during operation. For carbureted engines only—not compatible with EFI systems, knock sensors, or mechanical fuel pumps.

Products specifications

Fits

Ford F-150 1975-96, Mustang 1969-73, 1979-95, Explorer 1996-2001, F-250 1969, 1972-74, 1977-96, Bronco 1968, 1975-77, 1980-96, Thunderbird 1977-88, 1991-93, F-350 1972-97, Maverick 1971, 1973-77, Galaxie 500 1968-74 + 50 more models

Agricultural Equipment

N

Application Specific

Y

Car/Light Truck

Y

Engine Specific

Y

Heavy Duty Truck

N

High Performance

N

Industrial/Off Highway

N

Marine

N

Medium Duty Truck

N

Personal WaterCraft

N

Small Engine

N

SnowMobile

N

Transmission Specific

N

Freight Class

50

MotorCycle/RV

N

Non-Vehicle Specific

N

Qty Of Eaches

1

The website was very easy to use and had the prop I was looking for.

Quick and easy / Affordable

Great pricing and availability offered.

Service was great. I am still waiting for my return label.

Quick & easy! Just what I was looking for.

Ordering went smooth, good prices. Hope everything else goes well.

Smooth easy and clear!

part came within 1 day of purchase / undamaged , Would use again!

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