tchase said:
So the sensors are the same basically, just need to wire them up to a renix TCU? Here's where it gets a little odd, I remembered as soon as you mentioned it that Renix and HO flexplates are different. Thought for a moment that that would be an issue. However, the engine runs with the t-flite in it, so what the heck kinda flexplate is in there now? Obviously the CPS is reading properly. Would a t-flite accept an AW4 flexplate? Or do I have a flex-plate out of a Renix/t-flite YJ? Were there even Renix YJ's? Also, I assume I already have an auto TB as there is a TV cable on it. Will the '93 cable work? Haven't actually looked at the TPS but I'll assume I'm gonna need one of those for an AW4.
Having done some research and having swapped a 99 AW4 into my 89 MJ, I can offer some insight.
The AW4 transmission and sensors are the same between a 93 and 89 AW4. The TCU is virtually identical between the Renix and HO engine up to 96, so you can use the existing 93 TCU. I think the comfort/power feature switch was deleted and the shift points tweaked a bit when Jeep switch to the HO engine which just means a few less wires to deal with. Also the later TCU will have wires for an odb connection which you can leave disconnected. So yes, you can use the 93 AW4 and TCU with the Renix computer.
Note in 1996/1997 the AW4 and TCU changed. The rear sensor changed from 1 pulse/rev to 4 pulse/rev, a front shaft speed sensor was added. The connector on the TCU is the same, but the connectors for the tranny wiring harness are different.
The Renix setup has an extra output from the TPS sensor wired directly to the TCU, so you'll need to swap the TPS if the torqueflite didn't have the same TPS. On 93 HO engine, the TPS doesn't have dual outputs, but instead gets a copy of the TPS output from the engine computer. For this swap, just wire the second set of outputs from the TPS to the TCU.
As for wiring, it's not trivial, but not too bad if you're good with wiring and don't mind opening up the wiring harness in the engine bay. You'll need the NSS switch on the side of tranny, wiring harness, tranny computer, tps, and tranny cable. You'll really need the wiring diagram to figure out where the extra wires from the tranny computer go and to hookup the backup light. There is a switch on the brake pedal that needs to get wired up (tell the tranny computer to unlock the torque converter if you step on the brake). You can ignore the handful of wires that go to the diagnostic port.
On the tranny cable, again I don't know what the torqueflite has, but you may need to find the bracket that holds the cable and swap the plate on the end of the throttle shaft to the one with the cable extra post. The tranny end of the AW4 cable is attached internally, so you'll need to keep that as well.
No idea on the flexplate. I'm using a 1990 flexplate with a 99 AW4. Don't know if the torque flight would bolt up, but you do need to use a flexplate from another Renix setup.
Driveshaft lengths may be an issue. You will probably need to swap the shifter and deal with the key/brake interlock.
This is a big job, have I scared you yet?
