Ah ok. You're starting all kinds of new threads, hard to keep up.

 

Are you running the relay mod as well or 80e segment?

 

Eh, I run the T42 TCM which basically has its own transmission OS... No segments or relays involved.

 

I'm using the relay method and my converter unlocks on the highway and then locks back up... not sure what it is...05 trans in a 06 truck.

 

So I looked at this a little today and havent made much progress. Increased pressure via the FMC table slightly and not really any difference. Locks to 160rpm even under very light load and slip increases with added throttle. Even in decel situations the converter has negative slip, which means its not really trying that hard to lock....im going to give Dave a call tomorrow and see what he thinks. Delivered trans torque was around 130 which is nothing basically, just steady state highway driving. I also logged trans input rpm and engine rpm, and, as expected, the tcc slip PID is reading the difference. Im not sure if that is how its calculated or if its just confirmation that it is indeed slipping.

 

Let us know what Dave says. He has great customer service

 

Did you increase or decrease the values in that table? I beleve that table work opposite meaning decreasing the values will increase the overall pressure of the tranny

 

Do you have any problems with yours slipping? I know you did the relay mod as well. I havent logged mine as it is still parked up here.

 

Decreased the values to match a stock 80e file, which is about a 8% reduction in the values (increase in pressure).

I dont see a table for something like a base pressure or a holding pressure. The pressure tables in there I see are just during the shifts, so how is pressure controled in the current gear after the shift? I assume it still uses the shift pressure table to reference the FMC table, but im not sure.

 

Have you had any work done to the valve body? The reason I ask about 3 weeks after I put my 4L80E in it started shifting funny. I could be cruising along at 45mph and the rpms would slowly start to climb or it would neutral out or maybe even drop down a gear. I did some research and talked to the local transmission shop that installs transgo kits in every 4L80E rebuild as well as reconditions the valve bodies and we both agreed I needed the transgo valve body repair kit. To buy it myself wasn't cost effective since the kit services like 10 valve bodies. I pulled mine off and took it to them and got it taken care of. The kit involves I believe boring the AFL and TCC valve bores a little larger and new valves are installed. Mine has worked perfect ever since. Being that the TCC circuit is originally a PWM circuit that may have caused enough wear in the bore you are simply losing your apply pressure. Its something to look into anyway if everything else has checked out.

FWIW I ran my 80E off the 60E code for years, no relay. With OBD1 there is so much more you can make changes to. I was able to find the shift solenoid state table and copy the 80E settings into the 60E tune and it shifted just like it would if it had a 80E tune in it and I didn't need a relay. Also I used the 60E's TCC on/off circuit to turn the TCC on and off on the 80E. My 60E had both a PWM and TCC on/off solenoid. I never even tried it using the PWM circuit to control it, I knew I wanted it on or off and this worked. I just disabled the codes for the PWM solenoid and 3-2 downshift solenoid and it worked out great for me.