TH350 / TH350C Transmission Rebuild Kit High Performance Stage 3 LS Kit

This Stage 3 High Performance LS “Less Steel” (Banner Kit) Rebuild Kit is our top-tier solution for GM TH350 & TH350C automatic transmissions (1969–1986 Chevrolet, GMC, Pontiac, Oldsmobile, Buick, and more).
Engineered for high horsepower builds, this kit features Alto Red Eagle high-energy frictions for maximum durability, thermal stability, and holding power under extreme load. Trusted by professional builders, it’s the choice for racing, towing, and serious street/strip applications exceeding 2,000 HP.
⚠️ Note: This LS “Less Steel” kit includes premium frictions and rebuild components but does not include steel plates. Ideal when you are reusing existing Kolene or RC90 steels in good condition, or pairing with your own preferred steel upgrade set.
 
🔧 Kit Includes:
Alto Red Eagle High Performance Friction Module – Maximum grip and durability under extreme load and heat
Alto Full Gasket Set – “Full Ring” design ensures superior sealing
Alto Red Eagle or Kevlar Front Band – Both heavy-duty, long-life upgrades (band type depends on stock)
Red Stripe Modulator – Crisp, adjustable shifts
Alto Nylon Filter – Enhanced flow and filtration
Alto Bushing Kit – Complete coverage, OEM fit
Alto Washer Kit – Full thrust washer set (not partial)
 
💡 Why Our Kits Stand Out
Many rebuild kits sold by bulk resellers are assembled using white-label import steels and mixed-brand friction modules. That means you might get one clutch from Alto, another from Raybestos, another from Exedy, and others completely unbranded  whatever was cheapest at the time. The other issues you’ll see from large resellers are the use of soft steels and white-label, no-name vacuum-board components sourced from overseas. These are often low-grade RB-rated steels at best, which will create uneven wear, shorter lifespan, and unpredictable performance.
 
Our kits are different. Every component is inclusive and matched:
Alto Red Eagle High Performance Frictions (USA-made)
Alto gaskets, bushings, washers, and filter (USA-made)
 
You know exactly what you’re getting consistent, proven components from the brand trusted by professional builders for over 40 years.
 
💡 Why Choose This Kit:
Complete Alto Components – Matched and quality-verified
True Master Kit – No filler, no mystery parts, no stock leftovers
Professional Grade – The same components we install in our in-house builds
USA Seller – Over 40 years of transmission rebuilding expertise, fast shipping, and dependable support
 
📦 Shipping Info:
Free Shipping to the Lower 48 U.S. States
Same-Day Shipping on 95% of orders
AK, HI, PR, APO – Contact us for custom shipping options
 
🛑 Build With Confidence
No corners cut. No cheap imports. No surprises.
⚡ Heavy Duty Alto Components – USA-made quality trusted by pros.
👉 Order once. Build it right the first time.
 
🔴 Alto Red Eagle® Frictions
Composition: Non-asbestos organic material with special high-temperature additives.
Performance: Designed for high thermal stability and high energy clutch applications.
Applications: Automatic transmissions, torque converters, hi-performance racing, and motorcycles
Friction Datasheets original
.
Friction Data:
Dynamic coefficient (μd): 0.124–0.136
Static coefficient (μss): 0.124–0.140
Durability: Tested at 10,000 cycles with an energy density of 350 ft-lbs/in², showing only 5% loss — very high endurance
Friction Datasheets original.
Rating: Mid/High Energy Material, meaning it is specifically suited for high horsepower, racing, and heavy-duty builds.