I've been searching the board for clues. I am not sure if I've got a problem but the transmission is not behaving as it was a couple weeks ago. I noticed the TC was not locking up. I don't have the equipment or tools to troubleshoot this so I went to a local reputable ("since 1955") tranny shop last week to diagnose the TC issue. At the same time I asked them to change the filter and pump new fluid in. They tell me yes the converter is bad. All the electrical signals are there solenoids working but it's not locking up. $2800 for a rebuild. No thanks!
Another shop (second shop) I spoke to mentioned the brake switch among many other things which could be a problem but they're backed up for at least a month. So I searched the board and a couple threads jived with the switch replacement. I'd rather replace a $30 switch than spend $2800. Which I why I decided to replace the switch. Which seems to have cured the no lock up issue.

Now, It's happily locking up now (the TC) maybe a little too happy? Just seems to be locking early and staying locked. Even if I climb a hill unless I put my foot in it to force a down shift. Does seem to provide much better mpg so far. I'm not sure if this is normal as it was behaving slightly differently a couple weeks ago.

Currently. Going through town it hits 35 and it locks within 2ish seconds lugging the engine down to 8-900ish rpm. Shift from OD to D and it drops a gear and gets rpm. Go back to OD it catches a gear and almost immediately locks up. Highway cruising, step on the brake and it unlocks. Release the brake it locks up again very quickly, within 2ish seconds. It's NOT stalling at stoplights either. Come off a highway exit and seems to stay locked unless you drop below about 30ish mph. Accelerate a little aggressively and it runs through the gears and hits about 55-57 shifts and almost immediately locks up.

Earlier (before not locking magically started) it would lockup similarly but gentle throttle would stay locked and accelerate, medium throttle would unlock and accelerate, heavy throttle downshift. Highway cruising, tap the brakes it unlocked, release and there would be a pause before locking. Don't remember exactly but 5 or maybe even 10 seconds.

For reference I have 2.59 gears. currently 35mph gives me 8-900 rpm, 55mph gives me about 1200 rpm. 70mph give me about 1600 rpm. Not sure how accurate the tachs are in these cars.

I have checked the ASR in accordance with the Ozzstar video and set to 71 inch pounds.
I used this brake switch from Davies Corvette. Looks exactly like the original other than the numbers printed on it. It's white unlike the one on the website.
Fresh fluid and filter from the first tranny shop.

Was my converter lazy and now functioning properly?
Maybe I put the brake switch in too far? It's exactly the same length and I installed at the same depth as the original.
I am tempted to put the original back in and see what happens.

Thanks in advance!

 

The switch on your brake does not determine when the TCC activates. It supplies the + feed to the solenoid. So long as it disconnects when you step on the brake and re-engages when you release, then it is operating as it should. The negative signal comes from the computer.

 

I understand that. It's just locking more hmm.. aggressively? than it was a few weeks ago. That's what makes me wonder if it was "lazy" before? It's now like I'm experience the automatic equivalent of CAGS. My 84 and 88 did not lock up as early as this one does now.

 

I don't think you do understand. Otherwise, you would not be thinking of putting the old one back in. I repeat, if the TCC unlocks when you step on the brakes and locks back up when you release the brake, then look elsewhere for your concerns. I told you the brake switch does not determine when the TCC locks up.

 

yes i fully understand the computer commands the lockup

if the brake switch is loused up the TC will not lock as it sees the brake applied. right or wrong?

 

What exactly are you complaining about? Here is a quote from your first post.

"Which I why I decided to replace the switch. Which seems to have cured the no lock up issue." Seems to me that this indicates it's time to step away from the brake switch issue. It is not "loused up" any longer. It is doing exactly what it is supposed to do. Move on to whatever your complaint is.

 

check the adjustment of your throttle valve cable