Cabz Posted April 13, 2006 Share Posted April 13, 2006 OK I realy want to swap an auto into my 88 MJ . I have transmisions and tcases availibe , Now the fun part :evil: I know that I have to swap wiring harnesses at least in the engine bay My question is has anyone done this ? do I have to swap the intierior harness as well? . Also will a XJ engine harness work with the MJ?. It seems Like the TCU wiring comes out of the harness and goes into the fire wall just to the right of the heater core hoses Correct? Does the power/comfort switch come off the TCU or tyhe main INT harness. I know the ecu and tps are also diffrent and My MJ also has the C101 conector above the brake booster ( so does the donor XJ) So can anyone shed some light on this for me? Link to comment Share on other sites More sharing options...
87manche Posted April 13, 2006 Share Posted April 13, 2006 I think that the TCU harness in the cab is needed. I think you also need a different ECU. Might want to look into making a manumatic. http://awshifting.com/ Link to comment Share on other sites More sharing options...
Eagle Posted April 13, 2006 Share Posted April 13, 2006 Why do you think you need to swap harnesses? The TCU in an '88 is free-standing, it isn't part of the ECU. The ECU is different, but I know people have driven manuals using the automatic ECU, and I suspect you can go the other way. Not certain, but I think all you need is the harness to connect from the TCU (which mounts under the right side of the dashboard, by the glovebox) to the engine harness. Link to comment Share on other sites More sharing options...
pingpong Posted April 13, 2006 Share Posted April 13, 2006 I am not sure about the TCU wiring or none of that. What I do know is The TCU's stay the same all the way up to at least 96. Also I would try and swap in a 92 and later aw4 so you can get the 23 spline output. The only reason why I say this is cause most aftermarket t-case are 23 spline inputs. Link to comment Share on other sites More sharing options...
Cabz Posted April 13, 2006 Author Share Posted April 13, 2006 Why do you think you need to swap harnesses? The TCU in an '88 is free-standing, it isn't part of the ECU. The ECU is different, but I know people have driven manuals using the automatic ECU, and I suspect you can go the other way. Not certain, but I think all you need is the harness to connect from the TCU (which mounts under the right side of the dashboard, by the glovebox) to the engine harness. Hmm :? I thought the TCU harness goes into the Jeep from the ecu throught the engine compartment then under the dash ? I will have to reinspect the donor. Link to comment Share on other sites More sharing options...
Cabz Posted April 13, 2006 Author Share Posted April 13, 2006 I am not sure about the TCU wiring or none of that. What I do know is The TCU's stay the same all the way up to at least 96. Also I would try and swap in a 92 and later aw4 so you can get the 23 spline output. The only reason why I say this is cause most aftermarket t-case are 23 spline inputs. Not a bad Idea :-D I will look into that option , It would be nice to grab one with less miles on it. Link to comment Share on other sites More sharing options...
rejeep Posted April 13, 2006 Share Posted April 13, 2006 from my experience with XJ's 92-96 HO motors, the harness is one big rats nest of wires that include both body, engine and transmission controll. I would think its a big mess, only to be taken on by the very devoted to thier swap plans. YJ's in comparison have seperate body and engine/trans controll so the swap is simpler... Just my opinion.. go for it were here to help. Link to comment Share on other sites More sharing options...
Cabz Posted April 14, 2006 Author Share Posted April 14, 2006 from my experience with XJ's 92-96 HO motors, the harness is one big rats nest of wires that include both body, engine and transmission controll. I would think its a big mess, only to be taken on by the very devoted to thier swap plans.YJ's in comparison have seperate body and engine/trans controll so the swap is simpler... Just my opinion.. go for it were here to help. But the Yj's don't have the aw4 do they? Thats the trans I am trying to run Link to comment Share on other sites More sharing options...
M357.5 Posted April 14, 2006 Share Posted April 14, 2006 Look into an AWShifting set up........BrettM sells them. Does away with the TCU and replaces it with a 5 position rotary switch and a toggle for the lock up torque convertor. Super simple to install and lets you shift the trans manualy with a turn of a dial. I installed one in my MJ and it works very well. He sells 2 different kits......1) an overide setup that disables the TCU on demand 2) a manual version for swappin an AW4 without the TCU. :-D Sorry......just read your reply.......YJ's use an A999 3 spd trans with no TCU. Link to comment Share on other sites More sharing options...
feerocknok Posted April 14, 2006 Share Posted April 14, 2006 Don't want to thread hijack, so would someone be able to PM me if they know anything about the that AW style set up for a 904? Or who I could talk to that would know? Link to comment Share on other sites More sharing options...
commando14 Posted April 14, 2006 Share Posted April 14, 2006 Here's what you will need to get: 1) ECU (one for an auto) 2) TCU and harness 3) TPS (one for an auto) 4) engine compartment wiring harness (you can splice in the parts you need, but it's much easier and faster just to do the whole harness) 5) the kickdown cable and shifter cable for the AW4 6) the bracket that mounts the kickdown cable onto the throttle control And here are a few things you will need to modify to complete the swap: 1) Crossmember needs to be moved back about 5" 2) Rear driveline needs to be shortened 3) Front driveline needs to be lengethed (or just find some donors out of another xj or mj) Forget about the Power/Comfort switch, it doesn't do much. And you won't need to change the wiring harness under the dash. The manual awshifting setups you can buy are just not worth the money to me. All you have to do is splice into a few wires and you can rig up your own manual shifting and torque convertor control. Link to comment Share on other sites More sharing options...
Cabz Posted April 14, 2006 Author Share Posted April 14, 2006 Here's what you will need to get: 1) ECU (one for an auto) 2) TCU and harness 3) TPS (one for an auto) 4) engine compartment wiring harness (you can splice in the parts you need, but it's much easier and faster just to do the whole harness) 5) the kickdown cable and shifter cable for the AW4 6) the bracket that mounts the kickdown cable onto the throttle control And here are a few things you will need to modify to complete the swap: 1) Crossmember needs to be moved back about 5" 2) Rear driveline needs to be shortened 3) Front driveline needs to be lengethed (or just find some donors out of another xj or mj) Don't forget the trans cooler lines :shock: So I won't have to swap all the intierior wiring? Thats a plus :-D I have the rest of the items I need, and I can do the job It's just the wiring issue. Right now I have an MJ with NO wiring issues ( rare aint it :D ) So swallowing a job like this is tough , But I can do it a load cheaper than an ax15 swap. Forget about the Power/Comfort switch, it doesn't do much. And you won't need to change the wiring harness under the dash. The manual awshifting setups you can buy are just not worth the money to me. All you have to do is splice into a few wires and you can rig up your own manual shifting and torque convertor control. Link to comment Share on other sites More sharing options...
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