Gotcha..............I thought you meant "Never" in 2nd.

And it's quite obvious on mine when it locks the TC. There is that much of an rpm drop when it happens.
I've never seen or felt mine lockup under 40 or so mph either. Usually somewhere between 40-45mph under part throttle.

 

That 40 mph is important. That is why it is important to properly regear the speedo gear so dash mph is within 1 mph of GPS actual speed. This needs to be done any time with bigger tires or gears. This is so the TC will lock at cruise and get better fuel mileage.

 

So I use to have a 1990 xj and on the dash it had a switch for the trans that said comfort or firm. Was factory switch.

What effect did this have? Would it be related or be affecting the torque converter lockup?

 

It is possible that if the brake light switch wasn't in the proper position, that you wouldn't get TQ lockup. (it would assume you were pressing on the brake pedal) But I'm pretty sure your brake lights would be on all the time.[/QUOTE]

My brake lights weren't on with the tcc switch slightly compressed.

 

My brake lights weren't on with the tcc switch slightly compressed.[/QUOTE]

Yeah, I was referring to the later models that are integrated within the brake light switch.
Yours has a separate TCC switch.

 

Different deal.

Here's what you do with those:

Bypassing the Power/Comfort Switch on a Renix Jeep

Remove and unplug the switch. In the harness are 3 wires One has a stripe, one is tan, and the other black. Make a 4" jumper wire with a male spade at each end. Plug one end in the cavity for the tan wire and the other in the cavity for the striped wire and you'll be in permanent Power mode. Stuff the harness back in and reinstall the switch for looks.

If you happen to have a 91 or 92 XJ/MJ and it has the Power/Comfort switch, just jumper the Tan and Blue wires in the harness plug.

NEVER include the black wire when jumpering!!!

 

Got the info flowing now!!! LOL. That is good. Your are right Cruiser, the brake lite switch only stops it. Here is what mine was doing before I put the by-pass in. The trans would shift four times. Once in a while I could feel it go into lock up only for a couple of seconds, then drop back out. What got me thinking something wasn't working was the high RPM's in forth, (2200rpm). Thought that was a little high for a stock XJ. I did notice that when I would go into coast mode the RPM's would fluctuate by a couple hundred
RPM's, probably jumping in and out of lock-up, which leads me to believe the trans speed sensor is bad, didn't get to check it yet. I did the solenoid test, everything falls well in the range of being good. It sure would be nice to get this working the way it should. Thanks for all the input.

 

This is what may be my whole problem. I know my speedo reads faster (5-8 miles) then my GPS. I don't know what size tires it was specked out with, but I have 235-75x 15 on it now, what it had when I bought it.

 

My brake lights weren't on with the tcc switch slightly compressed.[/QUOTE]

My brake lite switch is not adjustable. I have the one that has two flat two wire plugs on it

 

The tCC switch unlocks it, not the brake switch.

On deceleration, to have the RPMs fluctuate at 1000 plus or minus is not the TC locking and unlocking.

 

How did you adjust the white plunger for the torque converter switch? I have the same issue with my 89 cherokee aw4 right now. I have a REM unit and can see when the brake switch is on as well as when the TC is locking up. It is very intermittent. I don't know how to make the adjustment. I can hold the brake pedal up with my foot and it keeps the brake switch off when cruising and allows the TC to lock up. If I let go then it will likely cause the brake switch to come back on and prevent tc locking up. I would like to not have to hold the pedal in the right position to make this happen. Thanks!! @cruiser54

 

The body of the switch is threaded; just push/thread it in a little bit...

https://www.cherokeeforum.com/f2/bra...9/#post3047838