This is for people stuck using the 87-90 mustang A4LD with a computer that wont support it... (most 2.3 turbo computers, also a good upgrade for a 79-86 2.3 mustang to I guess)
How to get CCL (Clutch Converter Lock-up) on a A4LD without the computer
First, to let you on a little back ground info. The 87-90 mustang A4LD is all hydraulic 1-2, 2-3, and even 3-4 shifting. There is only 2 connections on the whole trans. Park/Neutral safty switch and CCL. The CCL switch is only a 2 wire connection right behind the bellhousing on the drivers side of the transmission, where as the park/neutral switch is a 4 wire connection.
Now, you need to pull the connecter off and look at it
Now with a test light (grounded to the negative side of the battery) test to see which wire is the main power supply.
In my case, the red wire in the power supply line, so LEAVE IT ALONE!!!! (unless your using this trans in a 79-86 mustang, in which case you want it to get a constent 12V) Now you see the orange wire, that is your ground connection, now you want to wire it up to a switch because this will tell your CCL to either turn on or off **See note at the bottom** then just ground the other wire from the switch to a ground location.
I put my switch in my shifter cover because its in the open, making it easy to get to, and easy to remember to turn it off **See note at the bottom**
There, all done, and easy to get to/use. Now take it for a drive and see how it works...
**Note**
You want the CCL turned off when your not on the HWY so your easy on your transmission and your engine idles down when your "free" driving (no gas, no brake)
ALWAYS REMEMBER TO TURN IT ON WHEN YOUR AT HWY SPEEDS AND TURN IT OFF WHEN YOUR NOT!!!!
Me nor MustangForums.com takes any responsability for any damage done to your car/transmission