4th gear lock up

[huntsg]

Can someone tell me if adding a 4th gear lock up pressure switch is a good idea? What are the benefits? I have a rebuilt stock transmission. Thanks.

 

[SSedan64]

4th Gear Pressure Switch

Your Trans should already have a 4th Pr. switch installed. It's part of the TCC Lockup circuit, when the Trans shifts to 4th gear, pressure activates the Switch which completes the circuit = -Ground to the TCC Solenoid and TCC Lockup occurs.
Using the Lockup TC drops the Engine speed by about 150-200rpm @cruise speed, = better MPG.
GN's also have a 3rd Gear Pr. switch for TCC Lockup in 3rd.

TCC = TorqueConverterClutch

 

[huntsg]

Maybe I'm confused. I've been having lock up issues, lately once the car was warm it would bog down (RPMs would drop right after shift) shifting from 1st to 2nd and then 2nd to 3rd under normal load. Then when slowing down for a light it wouldn't shift at the right time, almost feeling like a standard transmission that needed the clutch depressed. Someone told me that this is more than likely the TCC solenoid going bad and causing it to lock up and not be able to unlock. By adding this (700R4 Transmission upshift sleeve Superior K013) kit it would only allow lock up in 4th gear and any downshift or pressing of the brake would release it from lock up.

 

[SSedan64]

That is just a Lockup Kit for retrofitting a 2004R/700R4 into another vehicle.

Sounds like you have a TCC Solenoid problem, very common.
Info >> TH200-4R TCC Solenoid Transmission Problem
The factory Solenoids with Harness are no longer available, just get a Universal Solenoid. Local Trans Shop should have one, or >> 2004R transmission solenoids, Transmissionparts US.com