4x4 swap - 94 XJ to 96?
#16
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Year: 1996
Model: Cherokee (XJ)
Engine: 4.0
Yeah, OBD1/2 shouldn't matter. Assuming he's not swapping auto for manual or vice versa, the transmision should be a straight swap as well. If it's an auto, the NSS should be the same, so no need to risk breaking it by trying to swap them, unless you want to disassembly and clean it while it's more accessible. As mentioned, I think the only snag will be the wiring for the speedo being in the xfer case instead of the trans tailcone and the 4x4 lightswitch.
#17
Senior Member
The reverse lights may not be working if the Neutral safety switch is not clean. Best to look into rebuilding that while you are working on everything.
You should have no problem swapping over the transmission, transfer case, front axle, and etc.
Being that the engine will be staying, you should not have to worry about the OBD differences from the parts vehicle.
Worst case, you can always keep an eye out for another parts jeep and part this one (94) out.
You should have no problem swapping over the transmission, transfer case, front axle, and etc.
Being that the engine will be staying, you should not have to worry about the OBD differences from the parts vehicle.
Worst case, you can always keep an eye out for another parts jeep and part this one (94) out.
#19
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Year: 96
Model: Cherokee (XJ)
Engine: 4.0
as far as I can tell, the 94 and 96 share all wiring, transmission function, body parts etc etc...except OBD2 vs OBD1 engine harness and PCM
The 94-96 TCM is in total control
from 97 the PCM is also involved with trans
I am in Australia though, I believe the USA had some slight variation to what we have, such as instruments
#20
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Year: 1989
Model: Comanche (MJ)
Engine: 4.0
Yes..same TCM part num
as far as I can tell, the 94 and 96 share all wiring, transmission function, body parts etc etc...except OBD2 vs OBD1 engine harness and PCM
The 94-96 TCM is in total control
from 97 the PCM is also involved with trans
I am in Australia though, I believe the USA had some slight variation to what we have, such as instruments
as far as I can tell, the 94 and 96 share all wiring, transmission function, body parts etc etc...except OBD2 vs OBD1 engine harness and PCM
The 94-96 TCM is in total control
from 97 the PCM is also involved with trans
I am in Australia though, I believe the USA had some slight variation to what we have, such as instruments
I think 94 and 96 are both OBDI, at least the US version. 97+ the trans computer still controls the shifting. The only connection to the PCM is the OBD bus for diagnostics.
Last edited by lawsoncl; 10-20-2019 at 01:59 PM.
#23
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I think even though 96 is an OBD2 system, I don't think that the trans (TCM) is connected with the computer. That I believe happened in 1997 with the redesign.
There may be a sensor or two that may be different, but it should be something that could be spliced or changed as needed.
There may be a sensor or two that may be different, but it should be something that could be spliced or changed as needed.
#24
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Year: 96
Model: Cherokee (XJ)
Engine: 4.0
I think even though 96 is an OBD2 system, I don't think that the trans (TCM) is connected with the computer. That I believe happened in 1997 with the redesign.
There may be a sensor or two that may be different, but it should be something that could be spliced or changed as needed.
There may be a sensor or two that may be different, but it should be something that could be spliced or changed as needed.
#25
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Year: 1989
Model: Comanche (MJ)
Engine: 4.0
There is a misconception that the trans computer was integrated into the ECM, when it moved to the drivers side of the dash and the connection changed. The only connection between the trans computer and the ECM is the OBD bus connection, and they share the TPS sensor output. The trans computer has it's own speed, brake pedal, etc sensors and controls the shifting. The ECM has no role in controlling the transmission.
The trans computer itself has had a few changes over the years. Changing the output speed sensor from 1x to 4x, adding a front input speed sensor (somewhat misnamed since it's not actually measuring the input shaft, and doesn't work in 4th gear), eliminating the power/comfort switch, changing from serial to obd1 to obd2 on the diagnostic lines, and the shape of the case and connector changing when it moved from the passenger side to the drivers side of the dash.
The trans computer itself has had a few changes over the years. Changing the output speed sensor from 1x to 4x, adding a front input speed sensor (somewhat misnamed since it's not actually measuring the input shaft, and doesn't work in 4th gear), eliminating the power/comfort switch, changing from serial to obd1 to obd2 on the diagnostic lines, and the shape of the case and connector changing when it moved from the passenger side to the drivers side of the dash.
#27
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Year: 1996
Model: Cherokee (XJ)
Engine: 4.0
I need some more advice from this thread. There's a 96 that popped up for $400, it has 180,xxx miles and an engine knock. I asked him if the transmission and 4wd worked and he said he hasn't driven it, he bought how it is and got the engine ready to pull but then didn't have the money to continue. So do I go through with it because it's only $400 and hope everything works? Also I'd have to rent a truck and dolly because it's about an hour and a half away so thats another $200 but still only $600 if everything works.
Last edited by Spencer_P; 10-27-2019 at 05:59 PM.
#29
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Year: 1996
Model: Cherokee (XJ)
Engine: 4.0
The guy said he ran the engine for about ten minutes and it has a spun bearing and is pouring oil somewhere. He said the previous owner was driving it when it overheated and started knocking
#30
Senior Member
Honestly, for $600, its a gamble but its not that bad. Worst case scenario, you could sell it for scrap and you wouldn't be out that much money.
My guess, from what you have said, is that it would probably be ok for your needs as far as parts.
My guess, from what you have said, is that it would probably be ok for your needs as far as parts.