Got a single disk installed (2600) the problem I`m having is even when locked up it seems to slip about 500rpm.
I`ll be on the highway and give it a little gas and the rpms will jump as if it wasn`t even locked up.
The truck is loud and the wife is not happy.
When locked I would expect the the engine to lug untill it unlocks but even the slighest gas imput raises teh rpms.
Tuning?
Im ready to go back to stock.. this would be a huge $$ waste. Around town it`s ok. On the higway it sucks.

 

Sounds like tuning. I would call FLT for some advice before you hurt the trans. A slipping tcc cannot be good for the trans because of heat it's creating. You need to get it fixed asap.

 

Its probabbly a tuning issue. My Yank did some weird things on the highway as well and I'm not sure what he did but Rick@Synergy tuned it out and then it ran better than the stock converter did.

 

It also throws a P0894 code too.. Hopefully tuning will solve it but it sound like a mechanical problem to me. Even around town I can feel the converter lock up ,rpms will drop, but the slighest gas input will bring the rpms up.

 

• Slip speeds greater than about 400 RPM at steady state driving are usually caused by a slipping
clutch or band.
• Slip speeds ranging from approximately 100 to 400 RPM at steady state driving are usually caused
by the TCC not applying but may also be caused by a slipping clutch or band.
• A plugged or restricted TCC apply fluid orifice (238, located in the pump) may cause DTC P0894
or P1870, especially in low mileage vehicles with less than 8,000 km (5,000 mi).
• A converter clutch valve (224, located in the pump), which does not have full travel of 13 mm
(0.5 in) or is stuck in the off position may cause DTC P0894 or P1870. Inspect the valve for chips,
debris, nicks or burrs. Also, inspect the springs (225 and 226) to make sure they are not limiting
valve travel. A spring that is not fully wound may catch in the bore, limit valve travel and cause
DTC P0894 or P1870.
• A cracked or leaking TCC solenoid (part of harness 66) may cause DTC P0894 or P1870. Use
solenoid test kit J 44246 to test the operation of this solenoid.
• A cracked or leaking TCC PWM solenoid (396) may also cause DTC P0894 or
P1870.
When attempting to diagnose a DTC P0894 or P1870, it is important to also refer to the appropriate
Service Information (SI) document for further possible causes of this condition.

 

HMMMM well maybe pulse width modulation is the problem.
The Tahoe is an 04 Z71

https://www.performancetrucks.net/fo...ck+up+slipping