Introduction
This manual provides detailed instructions for the Proform 66172 Locking Transmission Dipstick, designed for Powerglide (Long) transmissions. It covers product overview, installation, operation, and maintenance to ensure proper function and longevity of your vehicle's transmission system. Please read all instructions carefully before installation and use.
Product Overview
The Proform 66172 Locking Transmission Dipstick is engineered for precise fluid level measurement and secure sealing. Its robust construction ensures durability and reliable performance in demanding automotive environments.
Features:
- Designed for Powerglide (Long) transmissions.
- Locking mechanism for secure fit and prevention of fluid leaks.
- Durable construction for long-lasting performance.
- Vehicle-specific fit ensures compatibility.
Specifications:
| Manufacturer | Proform |
| Brand | ProForm |
| Item Weight | 1.05 pounds |
| Product Dimensions | 6.3 x 27.95 x 2.36 inches |
| Model Number | 66172 |
| OEM Part Number | 66172 |
Setup and Installation
Proper installation is crucial for accurate fluid level readings and to prevent leaks. Follow these steps carefully:
- Prepare the Vehicle: Ensure the vehicle is on a level surface and the engine is cool. Consult your vehicle's service manual for specific transmission fluid check procedures.
- Locate the Dipstick Tube: Identify the transmission dipstick tube on your Powerglide transmission.
- Remove Old Dipstick (if applicable): If replacing an existing dipstick, carefully remove it.
- Insert New Dipstick: Gently insert the Proform 66172 Locking Transmission Dipstick into the transmission dipstick tube. Ensure it slides in smoothly without force.
- Engage Locking Mechanism: Push the dipstick fully into the tube until the locking mechanism engages securely. This prevents the dipstick from dislodging due to vibrations or pressure.
- Verify Fitment: Double-check that the dipstick is fully seated and locked into place. A loose dipstick can lead to fluid leaks and contamination.

Operating Instructions (Checking Fluid Level)
To accurately check your transmission fluid level using the Proform 66172 Locking Transmission Dipstick:
- Warm Up Engine: Drive the vehicle for at least 15-20 minutes to bring the transmission fluid to operating temperature.
- Park on Level Surface: Park the vehicle on a flat, level surface and engage the parking brake.
- Engine Running: With the engine running and the transmission in PARK (or NEUTRAL, consult your vehicle manual), carefully remove the dipstick.
- Wipe Clean: Wipe the dipstick clean with a lint-free cloth.
- Reinsert and Remove: Fully reinsert the dipstick into the tube until it locks, then remove it again.
- Read Fluid Level: Observe the fluid level on the dipstick. It should be between the "LOW" and "FULL" marks. If the fluid is below the "LOW" mark, add the recommended transmission fluid in small increments, rechecking the level after each addition.
- Secure Dipstick: Once the correct fluid level is achieved, reinsert the dipstick and ensure the locking mechanism is fully engaged.
Maintenance
Regular maintenance of your dipstick ensures continued accuracy and prevents potential issues:
- Cleaning: Periodically clean the dipstick with a clean, lint-free cloth to remove any accumulated grime or debris.
- Inspection: Inspect the locking mechanism and the dipstick tube for any signs of wear, damage, or corrosion. Ensure the gasket (if present) is intact and providing a good seal.
- Proper Storage: When not in use (e.g., during extensive engine work), ensure the dipstick is stored in a clean, safe place to prevent damage or contamination.
Troubleshooting
- Difficulty Inserting/Removing: Ensure the dipstick is aligned correctly with the tube. Do not force it. Check for any obstructions in the tube.
- Fluid Leaks Around Dipstick: Verify that the locking mechanism is fully engaged and the dipstick is properly seated. Inspect the dipstick's gasket for damage or wear; replace if necessary.
- Inaccurate Readings: Ensure the vehicle is on a level surface and the engine is at the correct operating temperature as specified in your vehicle's manual. Wipe the dipstick thoroughly before taking a reading.
Warranty and Support
For warranty information or technical support regarding your Proform 66172 Locking Transmission Dipstick, please refer to the manufacturer's official website or contact their customer service department. Keep your purchase receipt as proof of purchase.
Manufacturer: Proform
Website: Visit the ProForm Store on Amazon





