I just installed an Art-Carr(supposedly though I have no reason to doubt it) 4L60E and a Yank SS 3600 converter. I am fairly certain the Yank is a lockup converter, but it is not locking up due to the trans not having a lockup solenoid installed(as far as I can tell).

I believe the trans was built for use with a non-lockup converter, and then later someone installed a lockup converter. Assuming this is the case, is restoring the lockup function at this point feasible? I would really like to be able to lock the thing up in overdrive.

Edit: Also, will trans. DTC's set the MIL? I dove the car around the parking lot with the trans. connector unplugged. I'm assuming this would set all kinds of codes, but the check engine light is off.

 

Well, I hooked up the Mastertech today and cleared a multitude of trans. codes, but still no lockup. Can anyone comment on whether or not is is possible to fairly easily restore the lockup function? I am assuming the TCC solenoid has been removed and the hole blocked off, because there's a connector dangling right at the front of the valvebody where I assume the solenoid was mounted.

 

Frank, anybody??????

Pretty please!

Here's some pictures of the valvebody with the pan off if that helps: http://touchofeden.smugmug.com/gallery/3209143#P-3-15

 

All right, one more try.....

 

Is there an o-ring on the input shaft? (could not tell if it is there from the pictures) it is about a 1/4" from the tip of the shaft. If there is not an o-ring here, you will not have lockup at all.

 

Ok. The lock-up solenoid on your '95 is hard wired into the wiring harness. It's located just in front of the valve body, and is bolted to the case with (2) 10 MM bolts. It looks to have a universal wiring harness, which would explain the extra dangling wire.
Your converter is most likely a lock-up...BUT...I see that it was built in 2003. Yank used to have a tremendous problem with lock-up clutch failure in their converters.

Pull the filter off and get me GOOD pictures off the transmission, near the front of the valve body (where the filter goes in, and surrounding solenoids).

There are many inputs needed by the computer to make lock-up occur. You should have the car scanned and run it with a datalogging scanner attatched, so you can see if your computer is commanding lock-up.

I'm not aware of anyone selling a non lock-up 4L60E, but who knows what Art Carr may be trying If it were converterd to a non lock-up similar to what a 700R4 is, then no, it's not a non lock-up transmission. I can see from the picture that the o-ring in still on the input shaft, and the ball and capsule are still in the end of it.

Frank
CPT

*EDIT* I just seen the rest of the pictures. You've got a '94 transmission. It's not going to have lock-up in a '95 vehicle. You don't have a PWM solenoid on the valve body. The pump and valve body are different from '94 and '95.

 

Thanks guys. That sucks to hear, but it is what it is I guess. Is there any way to add a lockup solenoid and modify the wiring/ECU to make it lockup, or am I SOL?

 

you could flash your pcm with a 94 file and change a couple wires around and have standard on/off tcc instead of pwm

 

That would be fine with me. As far as I know the PWM has already been disabled through tuning by PCMFORLESS, though I'm not 100% sure. I thought that was one of the things Brian did to the program, but I could be mistaken, though the stock tranny locked the converter up very positively. Maybe I'll have a look at the wiring diagrams for a 1994 and a 1995 and see what needs to be done(unless one of you guys has already been through this and can explain to me what needs to be done). Thanks for everything so far!

 

i think 1 wire at the trans connector needs to be moved then flash the pcm with a 94 bin file

 

I just had a look at the wiring diagrams, and both 1994 and 1995 4L60E's use terminal "T" for TCC lockup, and the 1995's use terminal "U" for PWM, which is obviously not used on 1994's. I think I may take the TCC solenoid out of my 1995 trans., put it in the 1994 and see what happens. Right now it's only setting one DTC for the TCC circuit, so I'm pretty sure the PWM is already tuned out.

 

A simple solution and some may call it junk yard but it does work, is to swap the electronics (solenoids and harness)from the 95 to the 94 transmission the PWM will become a dummy solenoid and fool the PCM lockup will work but may come in a little early which can be easily fixed in tuning by raising the lockup points. I have done this and it works well hope this helps

 

That actually sounds less junkyard than splicing together a bunch of crap inside the pan. I may just do that and se what happens. Do you know if there will be any issues with fluid flow or anything switching back over to lockup? I don't know what's typically done to a trans. when building it for a non-lockup converter, but the only thing I can guess is that there's some sort of block-off plate over the TCC solenoid hole that I'll have to remove. I don't want to install the solenoid and then find out that somehow I've mysteriously fried the pump or a clutch pack due to re-routed fluid flow or something.

I can build engines all day long, but automatic transmissions still scare me.