to start I have searched and gone through many torque converter threads, and I have adjusted the kick down cable several times so
the thing is it will lock up at lower speeds but it barely locks up at 45mph and absolutely will not lock up any faster than that, where should I even start with this?

 

Start by testing your TPS. The TPS has two sides to it, one to the Engine computer, one to the Trans computer. Torque converter lock-up is adversely affected by a faulty TPS. It can be tested with a simple voltmeter. PM me with your email and I'll return to you a set of simple instructions for diagnosis and adjustment of your Renix TPS.

 

huh, the tps has been acting up was gonna replace it anyway but I email ya anyway

 

Cut the dumb computer out!

https://www.cherokeeforum.com/f2/tor...ts-help-74255/

 

I want to do that, but i also just want it to work properly first then I'll make it better
i have four or five links with that mod bookmarked too

 

Ok, so I tested then adjusted the TPS, thanks Cruiser54, the ground checked out alright (.3ohms) and it was only off by 6/10 of a volt, it drives better but the lock up situation is the same

 

Did you test it on the engine or trans side?

 

I tested the trans side

 

Well, it might not be a bad idea to check the trans side of the TPS with an analog meter, you know the one with a needle.

While probing the output voltage, move the throttle from idle to WOT watching to see iif the needle drops, with the key on and engine off of course.

I just flashed on something else that I did when my wife's XJ was shifring weird.
Over near the trans dipstick tube are 2 rather large connectors, one gray and one black. They carry signals between the trans, TCU, and it's sensors. I unplugged them, sprayed em out with electronics cleaner, added dielectric grease, and plugged them back in . Problem was solved.

 

Another idea:

Check to see if the 7.5 amp "trans" fuse is blown. If it is, the TCU defaults to the "Comfort" mode and that causes premature TC lockup. This is usually caused by a shorted Power/Comfort switch. Easy to bypass that BTW.

If it's not blown, the Power/Comfort switch may be bad anyway. Again, easily bypassed.

 

Would a bad switch make it not lock up as well?

 

Actually, probably not. But a bad brake switch might.

 

Oooh! Good call, ill pick up some contact cleaner after work tomorrow and hit every thing.

 

The brake light switch only unlocks the converter...

 

Isn't that the problem? TC not locking up?