• 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


Required tool kit 84754-TL5 is no longer in production. Check with your distributor for availability.


The Sure Cure® Kit
Part No. SC-4T60E

Fits '93–'96 units.

View Instructions Find a Distributor

Sonnax Sure Cure Kits combine the best Sonnax products into one box, offering rebuilders a convenient and cost-effective way to address common transmission problems. These kits simplify ordering, stocking and estimating job costs, and include easy-to-read, step-by-step instructions that cover the inspection and repair of the most critical areas of the unit, and even a reference list of rebuilding specifications.

This kit is fully compatible with '93-'96 units, which are identified by a steel TCC apply valve that will fit in a 15mm wrench.

  • 1-2 Roller Clutch Spring Kit
  • Thrust Washers (2) Differential Side Gear
  • Pump Slide Pivot Pin
  • Modulated Line Boost Valve Kit
  • Reverse Boost Valve Kit
  • TCC Regulator & Isolator Valve Kit
  • Oversized TCC Apply Valve Kit
  • Checkball .375" Dia.
  • Checkballs (9) .250" Dia.
  • Shim Input Clutch Hub .010"
  • Shim Input Clutch Hub .020"
  • Shim Differential Carrier-to-Case
  • Retainer Clip Boost valve

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

GM 4T60, 4T60-E Valve Body Layout

GM 4T60, 4T60-E Valve Body Layout

  • 4T60-E The Sure Cure® Kit SC-4T60E
Sonnax Sure Cure Kit

The Sure Cure®

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