yellowoctupus
NAXJA Forum User
- Location
- Silverdale, WA
So I'm diggin', diggin', diggin', to try to reduce surprises as I go down the path of making my wife's DD 1998 2wd auto a 5sp 4wd. The object of this swap is to still retain DD 'stock' like Jeep, not making a wheeler at all. I have a '55 Willys for wheelin' already. Here's what I've got so far:
1998 Cherokee 2wd AW4- Rear Dana 35 (swapped in due to a dead 8.25 years ago)
1992 Cherokee 4wd AW4- Axle Donor, Rear 8.25, Front Dana 30
1991 Cherokee 4wd AX15- Trans, driveshafts, pedals etc donor
So, I think I should have most of the 'large items', trans, pedals, tc, driveshafts, axles, etc, but I'm sure it's going to be the 'little things' that kill me when I'm doing this swap.
I did the internal to external slave swap a few years ago on a (sold) 91 Comanche I had, and was very happy with the results, but I ran across this, which I could find nothing else about!:
"Also, some people adapt Jeep Iron Duke four-banger or '75 Land Cruiser external slave cylinders to the early AX15 bellhousings."
From: http://www.fourwheeler.com/how-to/transmission-drivetrain/131-0606-aisin-ax15-bolt-on-transmission-swap-jeep/
Questions:
1. Anyone know what the above mentioned Iron Duke external/internal swap is all about? If it's reasonable to do, I'm all in. Internal slaves suck! (although the 91's right now feels good...)
2. Can I swap out the complete pedal hanger from the '91 into my '98, or are there firewall/steering column differences?
3. Do all of the crankshafts have the same diameter pilot? Ie, can I just purchase a pilot bearing for a '91 and expect it to fit the crankshaft AND the input shaft?
4a. Regarding the ECU, for a 98, can I jumper a few wires in the harness to the ECU to make it think it's in Park or Neutral? I read about doing this for a 91, but I know there are vast differences between 91 and 98 regarding ECU to TCU and Transmission communications. If not, how can I identify a manual ECU that will work for our truck? (98-01, 96-01 OBDII cutoffs etc?)
4b. If I run the auto ECU, will it go into some BS 'limp home' mode if it has no / incorrect signals from the trans/TCU, or will I just get the CEL with no other reduced drivability?
5. Regarding flywheels, I read that you must get the correct YEAR flywheel to get the CPS to read properly. Omix Ada's PN on Rockauto shows the same flywheel for 1991-1999 XJ's. What's the scoop?
6. Seeing as my donor axle vehicle is an auto, I'm ASSUMING it has the 3.55 gears, where it is probably supposed to have 3.07 gears for the 5sp. Can I just reuse the speed sensor from the 98's auto transmission to get the speedo to work properly?
7. Cruise control... will it work properly right away? I'm guessing it should have at least a clutch safety switch as well as a brake safety switch to 'cancel' it when either is depressed. Anything else?
8.
1998 Cherokee 2wd AW4- Rear Dana 35 (swapped in due to a dead 8.25 years ago)
1992 Cherokee 4wd AW4- Axle Donor, Rear 8.25, Front Dana 30
1991 Cherokee 4wd AX15- Trans, driveshafts, pedals etc donor
So, I think I should have most of the 'large items', trans, pedals, tc, driveshafts, axles, etc, but I'm sure it's going to be the 'little things' that kill me when I'm doing this swap.
I did the internal to external slave swap a few years ago on a (sold) 91 Comanche I had, and was very happy with the results, but I ran across this, which I could find nothing else about!:
"Also, some people adapt Jeep Iron Duke four-banger or '75 Land Cruiser external slave cylinders to the early AX15 bellhousings."
From: http://www.fourwheeler.com/how-to/transmission-drivetrain/131-0606-aisin-ax15-bolt-on-transmission-swap-jeep/
Questions:
1. Anyone know what the above mentioned Iron Duke external/internal swap is all about? If it's reasonable to do, I'm all in. Internal slaves suck! (although the 91's right now feels good...)
2. Can I swap out the complete pedal hanger from the '91 into my '98, or are there firewall/steering column differences?
3. Do all of the crankshafts have the same diameter pilot? Ie, can I just purchase a pilot bearing for a '91 and expect it to fit the crankshaft AND the input shaft?
4a. Regarding the ECU, for a 98, can I jumper a few wires in the harness to the ECU to make it think it's in Park or Neutral? I read about doing this for a 91, but I know there are vast differences between 91 and 98 regarding ECU to TCU and Transmission communications. If not, how can I identify a manual ECU that will work for our truck? (98-01, 96-01 OBDII cutoffs etc?)
4b. If I run the auto ECU, will it go into some BS 'limp home' mode if it has no / incorrect signals from the trans/TCU, or will I just get the CEL with no other reduced drivability?
5. Regarding flywheels, I read that you must get the correct YEAR flywheel to get the CPS to read properly. Omix Ada's PN on Rockauto shows the same flywheel for 1991-1999 XJ's. What's the scoop?
6. Seeing as my donor axle vehicle is an auto, I'm ASSUMING it has the 3.55 gears, where it is probably supposed to have 3.07 gears for the 5sp. Can I just reuse the speed sensor from the 98's auto transmission to get the speedo to work properly?
7. Cruise control... will it work properly right away? I'm guessing it should have at least a clutch safety switch as well as a brake safety switch to 'cancel' it when either is depressed. Anything else?
8.