TransGo 48-Act-TL 4L80E Actuator Limit Valve Repair Kit
Instructions for Repair and Installation
Product Overview
The TransGo 48-Act-TL is a repair kit designed for the 4L80E transmission's actuator limit valve bore, which is prone to wear at approximately 100,000 miles. Worn bores can lead to low pressure when hot, clutch, band, and converter slippage, incorrect gear engagement, and diagnostic trouble codes such as 39, 85, and 68.
This kit includes a boring guide and a specialized cutter (reamer) to repair the worn bore, providing an estimated 5-minute fix. The kit's special valves offer 50% more linear support and oscillate less than the original design, significantly reducing wear and increasing the durability of the valve body.
Kit Contents:
- Boring Guide
- Boring Tool (Reamer)
- 6 Valves
- 6 Springs
Refill Kit Available: 48-ACT-VL6 (6 Valves and Springs)
Identifying Valve Bore Wear
To check for wear, move the actuator valve back and forth slightly within its bore. Feel for any up-and-down or side-to-side wiggle. Excessive play indicates a worn bore that requires repair.
Installation Instructions
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Step 1: Remove Old Valve
Remove and discard the old actuator valve and its spring.
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Step 2: Prepare Reamer
Coat the cutting end of the reamer with a light oil or Automatic Transmission Fluid (ATF). Slide the shank end of the reamer through the large end of the guide bushing.
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Step 3: Bore Repair
Insert the guide bushing and reamer into the valve bore until the bushing is fully seated. Install a vise grip onto the guide bushing, tightening it just enough to prevent the bushing from spinning. Ensure the reamer is turned at a slow speed using a drill motor. After reaming, turn the valve body over and blow out any metal chips.
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Step 4: Install New Valve
Install the new, oversized actuator valve and the applicable spring(s).
Roll Pin and Clip Installation
For Roll Pin Type: Use the WHITE roll pin.
For Clip Type: Use the ORANGE clip and a PLAIN clip.
Component Identification
The kit includes a new design, oversized valve. The repair process utilizes a boring cutter (reamer) and a guide bushing. Components are identified as 1st Design and 2nd Design, with the 2nd Design representing the improved components in the kit.
