Transmission Compatibility

One of the biggest selling points of the 81120 Ratchet Shifter is its broad transmission support.

Ford Applications

Compatible with:

• Ford C4
• Ford C5
• Ford C6

Also compatible with:

• Ford AOD (requires installation kit #40496)
• Ford AODE (requires installation kit #40504)
• Ford 4R70W (requires installation kit #40504)
• Ford E4OD (requires installation kit #40505)
• Ford 4R100 (requires installation kit #40505)

GM Applications

Compatible with:

• TH200
• TH250
• TH350
• TH400
• 2004R
• 700R4
• 4L60
• 4L60E
• 4L65E
• 4L80E
• 4L85E

Chrysler Applications

Compatible with:

• A904 Torqueflite
• A727 Torqueflite
• A500
• A518
• A618

Supporting most 1966-and-newer Chrysler automatic transmissions.

What Is a Ratchet Shifter?

Unlike a traditional automatic shifter, a ratchet shifter moves one gear position at a time.

Benefits include:

• Positive gear selection
• Faster shifts
• Reduced risk of missed gears
• Improved racing performance

Each forward movement equals a single gear change.

This prevents accidentally overshifting during aggressive driving.

Self-Centering Ratchet Design

One of the best features is the self-centering mechanism.

After each shift:

• The handle automatically returns to center
• Maximum clearance is maintained
• Shift consistency improves
• Driver focus remains on the road

This design is commonly found on race-oriented transmission shifters.

Reverse Lockout Protection

The built-in reverse lockout helps prevent accidental gear selection.

Benefits include:

• Improved safety
• Protection against accidental reverse engagement
• Easier operation
• One-handed use

This feature is especially important in high-performance vehicles.

Neutral Safety Switch Included

The shifter includes a neutral safety switch designed to:

• Prevent starting in gear
• Improve safety
• Simplify installation
• Maintain proper operation

This is a valuable feature often required in street-driven vehicles.

Backup Light Switch Included

Another convenient feature is the integrated backup light switch.

Benefits include:

• Factory-style functionality
• Simplified wiring
• Improved safety
• Street-friendly operation

This makes the shifter more practical for daily-driven builds.

Simulated Carbon Fiber Housing

The aluminum housing features a hydro-dipped carbon fiber appearance.

Advantages include:

• Modern styling
• Lightweight construction
• Improved appearance
• Lower cost than real carbon fiber

The result is a clean performance-inspired look without the premium price tag.

Ideal Applications

This ratchet shifter works particularly well in:

Muscle Cars

Perfect for classic GM, Ford, and Mopar builds.

Drag Cars

Provides positive gear engagement during launches.

Street Machines

Adds performance styling and functionality.

Restomod Builds

Modernizes interior controls while retaining automatic transmission convenience.

Installation Considerations

Before installation:

• Verify transmission compatibility
• Confirm cable routing requirements
• Determine if additional brackets are needed
• Review wiring requirements for safety and reverse switches

Some transmissions require optional installation kits.

Pros and Cons

Pros

• Broad transmission compatibility
• Positive ratchet shifting
• Self-centering design
• Reverse lockout protection
• Neutral safety switch included
• Backup light switch included
• Race-inspired appearance

Cons

• Additional brackets required for some transmissions
• Installation complexity varies
• Not suitable for manual transmissions
• Simulated carbon fiber rather than real carbon fiber

Frequently Asked Questions

Does this fit a TH350 transmission?

Yes. TH350 applications are directly supported.

Will it work with a 4L60E?

Yes. Most 4L60E applications are supported.

Does it fit Ford C4 transmissions?

Yes. Ford C4, C5, and C6 transmissions are compatible.

What is the advantage of a ratchet shifter?

A ratchet shifter prevents overshifting and allows faster, more precise gear changes.

Final Thoughts

The 81120 Automatic Ratchet Shifter is an excellent upgrade for enthusiasts looking to improve transmission control across a wide range of GM, Ford, and Chrysler applications. With its self-centering ratchet design, reverse lockout protection, integrated safety switches, and broad compatibility, it delivers race-inspired functionality at a budget-friendly price point.

Because if your project car has enough horsepower to roast the tires at will, your shifter should probably be just as serious about changing gears.