Monte Carlo SS TH200-4R Shifts Hard or Stalls | TCC Solenoid Transmission Problem

Full write-up on Wrenches & Rides: https://wp.me/p9jEOW-3e
Parts needed:
- Transmission Control Solenoids TCS13 https://www.summitracing.com/int/parts/smp-tcs13/overview/
- ACDelco 12360654 Transmission Filter Kit https://www.summitracing.com/int/parts/ado-tf234/overview/
- 5 Quarts of Valvoline DEX/MERC ATF Transmission Fluid VV353 https://www.summitracing.com/int/parts/vlv-vv353/overview/
- ACDelco 08683502 4th Gear Pressure Switch https://www.summitracing.com/int/parts/ado-8683502/overview/

Torque Converter Lock-up Issue

Many cars in the mid to late 1980's were built with the 200R4 transmission because the 4th gear gave much better fuel mileage.  The 200R4 is really a good transmission and can hold a large amount of power when built.  It does have a few flaws that many people seem to overlook or never find a way to correct the issue.  Since these cars had miles of vacuum hose, many blame it on a vacuum leak, but it is really just a $20 TCC solenoid.

Here Are The Symptoms

After a fair period of time driving in 4th gear (OD), the transmission seems to downshift late when slowing to a stop.  This can cause the engine to stall or come very close to stalling.  Once normal acceleration begins, the transmission will upshift early holding low RPMs and giving a very stiff feeling in the shifts. Inside the transmission, the torque converter's lockup feature stays locked up in 2nd through 4th gears not allowing the engine to reach the peak torque output.  When stopping, the transmission stays in 2nd gear until nearly stopping when it shifts into first gear unlocking the torque converter allowing the car to recover from a near stall.

In the cars with the 200r4 transmission, the ECM controls the TCC lock-up feature by grounding negative side of the TCC solenoid, enabling lock-up. Power to the TCC Solenoid is provided through a switch on the brake pedal that interrupts power when the brakes are applied. This is what causes the lock-up to disengage when the brakes are applied and the car is stopping.

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