Guys,

I've just installed a new GM Serta 4L85E with a trans go shift kit and Vigilante 10.5" 2800 Triple Disk into my half ton. I had made a previous post with a couple videos about some clatter in the converter after the initial startup but that seems to have taken care of itself.

The transmission shifts great but the issue I'm having now is the converter clutch seems to be dragging and wanting to lockup while the truck is idling in gear. This does not happen all the time either. After the truck has come to a stop for a few seconds I can feel the engine load up and rpms drop slightly but won't stall the engine. When this happens, and you take off from a stop the converter won't stall up for a second or two until about 5-10 mph and then it will let go and stall up like normal. It's a very obvious bog when this happens. Also I can try and brake stall the converter while the truck is stopped and and the clutch is dragging and the RPMs will only hit 1100 or so at WOT. Very odd. At any other time I can brake stall this converter to 2500 PRM or so. Again this does not happen all the time. Any ideas?

This is a GM reman so I'm assuming all the electronics (lockup solenoid) are new.

I'm running a stock 2004 4L80E transmission calibration. The only other thing that is odd is the MPH the TCC locks up at. The factory setting is like 45 MPH but this thing won't lock up till like 50-55 MPH. I haven't had a chance yet to do any logging with EFI live to see when it's actually being commanded.

You think this clutch is to tight or needs to be broke in?

 

Was this a new or a used converter?

 

Hmm you do need to check out/tweak your tune, also is this the first 80e youve had? They def lockup/unlock different from a 60e, what kind of power are you running?


I have the PI triple disc and that badboy has lockup you can feel, its beefey and will hold the power!

But Also Call precision and ask for TERRY, he will help you, great honest knowlegable person.

 

Pressure regulator valve in the pump. sonnax sells a new setup that fixes it. fluid leaks by and causes the converter to lock once it happens. usually its worse in reverse since you run more line pressure in reverse.

 

You can patch it for now in the tune (need to look what table it was again) but thats most likely the issue

 

Here is what i installed when i built my 80

http://www.sonnax.com/system/announcement/34200-14K.pdf




And

 

Oh yeah, I forgot....

You have to modify the pump to run a multi-disc converter. Jeez, I'm glad you guys are on top of things.

 

Haha yep thats it! and a new boost valve dont hurt. seen a couple hang up and its no good!

 

Yep i was told to install that self regulating boost valve instead of the spring thingy that comes in the trangsgo HD-2 kit

 

Yes! its much more reliable and consistent imo. never had a problem out of the sonnax one.