Just installed a built by me 4L80E with a Circle D multi-disk TC. It has the HD-2 shift kit, internal dual feed, all new clutches, bushings, etc. Because of the internal dual feed, I didn't install the 3-layer separator plate, used a Transgo HD plate instead.

It drives well, all gears work, shifts okay (needs some tuning), but I have no TCC lockup, not even a smidgen.

I'm trying to force lockup with EFILive while driving and nothing! I can hear a very faint click when I turn the solenoid on with EFILive, but it's much much quieter than the shift solenoids. According to the log I took it tried to lock it up on its own too and nada.

Solenoids are all new, no codes, pressures seem okay. I get around 60-70psi at idle warm, and regularly gets around 150psi on the throttle, but I didn't watch the pressure gauge too much.

 

UPDATE:

I hardwired the TCC signal wire (pin S) to a switch to ground it when I want. When I turn it on while driving at lowish throttle nothing happens. But as soon as I increase throttle it starts to grab and the RPMs drop. If I give it enough throttle it will almost totally grab, the TC slip will drop to around ~100 RPM. I did this a couple times to verify my results, hope this didn't do too much damage to the converter.

So it sounds like its a mechanical issue within the trans. Anyone have ideas of where to start looking? I'd like to start with the things that are easy to get to such as the valve body. But I fear it might be the stupid o-ring on the input shaft. Bummer.

 

hows the pressure in the trans?

 

60psi hot idle, 80-90psi while cruising in 4th, and when I lay into the throttle it will climb up to 120-150 and the TCC will start to apply if I have the TCC solenoid grounded.

Gilbert suggested that it might be the TCC valve(s) in the pump. Looks like I'll be pulling it apart again

 

What is wot pressure?

 

180-200psi

 

Dont feel bad I put the damn tcc valve in the pump upside down last time. I'm a pro at pulling an 80e just wish I was a pro at building one.

 

What issues did that cause? I thought I was pretty careful when building it, but you never know!

 

I had no lockup. My trans still doesnt seem like it shifts hard enough,I'm also going to redrill my seperator plate to the largest size holes.

 

Thanks for the info, I'll definitely be pulling the TCC valve out of the pump, luckily that one comes out through the bottom of the trans like the boost valve. My 1-2 shift is pretty firm, but my 2-3 and 3-4 are butter, even with zero torque management and zero shift times, with stock pressures.