TH700R4 / 4L60 Rebuild Kit – Stage 4 Heavy Duty Master (87–93)

This Stage 4 Heavy Duty Master Rebuild Kit is designed for GM TH700R4 / 4L60 automatic transmissions (1987–1993). Built for durability and reliability, this kit uses Alto High Energy Graphitic (HEG) friction materials and matched components to handle increased load, heat, towing, and performance applications.

This is the same level kit we use in our own builds when a customer needs a true heavy-duty setup without stepping into full race materials.

🔧 Kit Includes:

• Alto High Energy Graphitic (HEG) Friction Module – Improved holding power and heat resistance over stock materials

• Alto Steel Plate Module – Matched steels for proper clutch clearance and longevity

• Alto Full Gasket Set (OHK) – Complete sealing solution for rebuild

• Alto 2–4 Band (Carbonite or Red Eagle) – Heavy-duty band for increased durability (varies by stock)

• Alto Bushing Kit – Full coverage, restores hydraulic integrity

• Alto Felt Filter – Reliable filtration and proper fluid flow

• Alto Washer Kit – Complete thrust washer replacement set

💡 Why Our Kits Stand Out

A lot of kits on the market are built from mixed-brand or off-shore components. You’ll see listings labeled “heavy duty” that include:

• Generic or white-label steels

• Mixed friction materials from multiple manufacturers

• Low-grade components that wear quickly or perform inconsistently

We don’t do that.

This kit is matched, consistent, and built around Alto components—a brand trusted by professional builders worldwide.

• Alto HEG Frictions – Proven heavy-duty upgrade over stock

• Matched Steel Module – No guessing on stack-up or clearance

• Complete Alto Soft Parts – Gaskets, bushings, washers, and filter

No filler parts. No guessing. No surprises.

💡 Why Choose This Kit:

• True Heavy Duty Build Kit – Not just a stock rebuild package

• Matched Components – Designed to work together, not pieced together

• Professional Grade – The same components used in our shop builds

• Application-Specific Fitment – Designed specifically for 1987–1993 units

• USA Seller – 40+ years of transmission rebuilding experience

⚠️ Fitment & Identification (IMPORTANT)

This kit is for: 1987–1993 TH700R4 / 4L60 (Non-Electronic Units ONLY)

• 1987 is a split year – early vs auxiliary valve body units

• 1993 is a split year – introduction of the 4L60E (electronic)

How to Identify:

• ✅ Has TV (throttle valve) / detent cable → 700R4 / 4L60

• ❌ Has main electrical connector on case → 4L60E (NOT this kit)

Auxiliary valve body units can be identified by the casting line running through the cooler line area.

If you’re unsure — ask. We’ll help you get the right kit the first time.

📦 Shipping Info:

• Free Shipping – Lower 48 U.S. States

• Same-Day Shipping on most orders

• AK, HI, PR, APO – Contact for options

🛑 Build With Confidence

No corners cut. No cheap imports. No mismatched parts.

⚡ Heavy Duty Alto Components – Proven, consistent, reliable 👉 Order once. Build it right the first time.

🟢 Alto High Energy Graphitic (HEG) Frictions

Composition: Graphite-infused friction material designed to improve heat resistance and durability over stock materials.

Performance:

• Higher heat tolerance than OE tan/brown materials

• Improved clutch life under load

• Stable engagement characteristics

Rating: Heavy Duty Material – Ideal for towing, work trucks, and performance street use (Not full race like Red Eagle, but a major upgrade over stock)

⚙️ Steel Plate Module

Function: Provides proper clutch surface mating and heat dissipation.

Key Benefits:

• Matched to friction module (no mix-and-match issues)

• Maintains proper clutch clearance

• Improves overall durability and shift consistency