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  • 2nd Clutch distress
  • 3rd Clutch distress
  • Low cooler flow
  • Low line rise
  • Low Reverse boost
  • Soft shifts
  • Converter shudder
  • Overheated converter
  • Code 39, 740, 1870
  • Falls out of lockup when hot



The parts in this Sure Cure kit repair and restore key areas most prone to TCC-related transmission problems and other issues affecting shift quality


The Sure Cure® Kit
Part No. SC-4T60E-1

Fits '97-later units.

View Instructions

Sonnax Sure Cure kit SC-4T60E-1 is a comprehensive reconditioning package for GM 4T60-E PWM units featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance. Sure Cure components are the same Sonnax parts sold individually to resolve common valve body complaints as well as other transmission problems. The high-quality Sonnax parts in each Sure Cure kit repair worn areas and protect the transmission against future damage. Each kit comes with easy-to-read, step-by-step installation guide that covers the inspection and repair of the most critical areas of the valve body.

  • Restore shift quality
  • Repairs biggest trouble areas to reduce comebacks
  • Includes step-by-step instructions for comprehensive valve/pump body restoration
  • Get everything you need for restoring troublesome units in one place

This kit is fully compatible with '97 & Later PWM units, which are identified by an aluminum TCC apply valve that will NOT fit in a 15mm wrench. For '93-'96 units, use SC-4T60E, this TCC valve is steel and WILL fit inside 15mm wrench.

  • Reverse Boost Valve Kit
  • Pump Slide Pivot Pin
  • Differential Side Gear Thrust Washers (2)
  • Retainer Clip Boost Valve
  • TCC Regulator & Isolator Valve Kit
  • Modulated Line Boost Valve Kit
  • Oversized TCC Apply Valve Kit
  • Shims, (2) Input Clutch Hub
  • Shim, Differential Carrier-to-Case
  • Checkball .375" Dia.
  • Checkballs (9) .250" Dia.

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

Read Now

  • Sc 4t60e 1 web

Sonnax Sure Cure® Kits

Comprehensive Kit for Big Problems You Don't Want Back

Knowing exactly what parts to replace in troublesome transmissions is an ever-increasing challenge, but Sonnax Sure Cure kits solve this problem for you. Each kit is a comprehensive reconditioning package featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance.

Learn More about Sonnax Sure Cure Kits