1980 vette transmission
Racer
Joined: Apr 2002
Posts: 352
Likes: 11
From: Glendale AZ
Re: 1980 vette transmission (frosty80vette)
With the L48 the car was born with the TH350. The California model had the TH350 with lock-up converter and all 1980 Corvettes sold in California had the LG4 305 engine. Just like the California model that is in my driveway.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Melting Slicks
Joined: Aug 2001
Posts: 3,050
Likes: 124
From: Wichita KS
Re: 1980 vette transmission (frosty80vette)
My 1980 350 ci (L-48 non California car) has the original, numbers matching, stock, TH350C transmission.
Someone may have replaced the original transmission at some point. Does the number on the transmission match the VIN?
Easy to tell, the "C" transmission, it has an electrical socket for the lockup on the driver's side. An electrical harness runs from that transmission socket to a vacuum switch on the firewall.
The firewall vacuum switch is controlled in-turn by a TVS (thermal vacuum switch) that prevents converter lockup when the engine is cold.
Someone may have replaced the original transmission at some point. Does the number on the transmission match the VIN?
Easy to tell, the "C" transmission, it has an electrical socket for the lockup on the driver's side. An electrical harness runs from that transmission socket to a vacuum switch on the firewall.
The firewall vacuum switch is controlled in-turn by a TVS (thermal vacuum switch) that prevents converter lockup when the engine is cold.
