ok gotta 700r4 behind my 300hp TPI 350. its got a 2nd gear lockup on the convertor. the trans shifts great with the TQ locked up no slippage. but when im in 4th gear cruisin at any speed if i get on it hard it feels like the trans slips but only a few hundred RPMs like its the convertor slippen? i am wondering if my diagnoses is correct on the convertor slippen out of lockup or not? and if so is it fixable? do i need a new convertor? and also should i be runnin it through the gears wtih the convertor locked up???? im pretty sure its a stock convertor. thanks in advance.

 

 

the converter is supposed to unlock with throttle pressure. How are you supposedly keeping it engaged? by keeping the power to the solenoid at all times? that would require aftermarket wiring and doesn't sound like you're using stuff like that. you could always test drive it with the wiring on the side of the trans disconnected and see if it still does the same thing. This would eliminate the torque converter clutch from the equation and the wiring from it also. the trans would shift all four gears but not get lockup this way so you could further diagnose if it is the trans or the converter/or converter wiring. note:it is the square connector on the drivers side of the trans.

 

no it is locked all the time. its on a toggle switch. i dont like drivin it with the convertor unlocked cause the tranny shifts soft.

 

exactly what I was getting at. eliminate the torque converter lockup temporarily to see if the trans starts slipping/etc. all by itself or if it is only with the torque converter being used. by locking the converter all the time you can't differentiate between the two. make sense? unplugging the connector is the best way so you can eliminate any external wiring as the cause (not to say you can't wire a toggle) because the toggle may not carry enough voltage potential-known as a voltage drop, or even the wiring doing the same. I think unplugging will help a lot in finding the root cause.