Pioneer Cables FRG-158H Automatic Transmission Ring Gear

Automatic Transmission Ring Gear for GM Applications

The Pioneer Cables FRG-158H automatic transmission ring gear is built for vehicles that need a direct replacement for worn or damaged starter ring gear teeth. With 158 teeth, a 15.984-inch outside diameter, a 15.012-inch inside diameter, and a 0.495-inch thickness, this ring gear is sized for specific Buick, Chevrolet, Oldsmobile, and Pontiac applications from 1975-1978.

When starter engagement wears the teeth or causes breakage, the engine may no longer crank reliably. The FRG-158H is made to match the original part’s fit and function for dependable service in the correct transmission application.

Key Features

• Automatic transmission ring gear for starter engagement
• 158-tooth design for listed GM applications
• 15.984-inch outside diameter for proper fitment
• 15.012-inch inside diameter and 0.495-inch thickness
• Direct replacement style for worn or broken ring gear teeth
• Pioneer Cables FRG-158H part number for identification and ordering

Detailed Description

The Pioneer Cables FRG-158H ring gear is a transmission hard part used where the starter motor engages the flywheel or flexplate ring gear to crank the engine. Over time, repeated starter contact can round off, chip, or break the teeth, leading to starting problems. This replacement ring gear is engineered to match the original dimensions and tooth count so it can be installed in the correct automatic transmission application.

This part cross-references 158H and RG70 for the same application. It is listed for 1975-1978 Buick Century, Regal, Skyhawk, and Skylark; 1976-1978 Buick LeSabre; 1978 Chevrolet El Camino, Malibu, Monte Carlo, and Monza; 1977-1978 Oldsmobile Cutlass, Cutlass Supreme, Delta 88, and Omega; and 1977-1978 Pontiac Catalina, Firebird, Grand LeMans, LeMans, Phoenix, and Sunbird. If you are searching for a transmission ring gear for a 1978 Pontiac Firebird or a 1977-1978 Buick Regal, FRG-158H is the listed replacement.

What It Helps Fix

• Engine cranking issues caused by worn starter ring gear teeth
• Grinding or slipping during starter engagement
• Broken or chipped ring gear teeth
• Starting inconsistency in listed Buick, Chevrolet, Oldsmobile, and Pontiac models
• Noise at startup caused by damaged ring gear surfaces

Installation Notes and Tips

Verify tooth count, outside diameter, inside diameter, and thickness before installation. Confirm the transmission and starter engagement setup matches the listed application for your vehicle. Proper alignment and inspection of the starter drive are important when replacing a damaged ring gear, since worn starter components can contribute to repeat failure.

Quality Assurance

Pioneer ring gears are built to match original part fit and function for the specified application, with dimensions and tooth count selected for correct service in listed GM vehicles. The FRG-158H is a replacement transmission hard part intended to restore reliable starter engagement when the original ring gear is worn or broken.