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AW-4 - Can it be made to work without a TCU |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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Yes, you can drill the smaller bolt pattern in it. |
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3557 |
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Instead of sifting through a scrap pile, why not just get the 4.0 flex plate, have it balanced to your original and be done with it.
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CamJam
Moderator Group Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6553 |
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I've read that before and don't really understand what they're saying about weird shift points. The TCU does seem to be programmed to select O/D as soon as possible-- for fuel economy I would assume-- but I don't find anything strange about the shift points otherwise provided the kick-down and throttle position sensor are adjusted properly. Shift points will be screwy if they're not, just like any automatic transmission. I also didn't add any external transmission cooler, just the same radiator cooling that the stock TF998 used. Here's the write-up I did on my AW-4 swap: |
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3557 |
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Depends on the year vehicle the trans was pulled from. 87 to possibly 90, there was a power/comfort rocker switch on the dash. Chrysler ditched the switch. Comfort mode 1,2, lockup, 3, 4 Power mode 1,2,3,4 lockup. |
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flejl
AMC Apprentice Joined: Nov/15/2021 Location: PA Status: Offline Points: 177 |
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ok, so I need a TCU if I want it to shift by itself, that is important because the wife and a manula, even "clutchless" will not work.
I have read the trans requires a Throttle Position Sensor (TPS), what is this for? I guess I am showing my age here....
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3557 |
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It serves half the function as a vacuum.modulator on some trasmissions or the rod on your torqueflite. Tries to match the proper shift speed based on how deep your foot is in it. It still has a cable for shift pressure.
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Online Points: 4097 |
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The AW4 requires a TPS (it needs to know how hard you're on the gas) and it also needs a VSS (vehicle speed sensor). The 2 sensors work in unison to determine vehicle speed and throttle input to adjust shift points accordingly. You can get a VSS that goes inline in the speedo cable. I've got a 2WD AW4 in my shed. If the M12 breaks again I may move to the AW4. A friend who does transmissions says he can make it handle my 390s HP and torque, since it's very similar to the trans used in V8 Toyota Tundras. I will have a TPS since I'm converting to Edelbrock Pro-Flow EFI this winter (got it sitting on the shelf). Bob tufcj
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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CamJam
Moderator Group Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6553 |
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The speed sensor is mounted on the transmission and connects to the TCU. It you get your AW4 from a wrecking yard it should come with it. Though things changed a little through the years, if you get the 91-96.5 AW4 you don't need the VSS on the speedo cable, which I think is mainly to work the Jeep's electronic speedometer and for ECM data. It's not needed if you use a mechanical speedometer drive from a pre '91 XJ. See the link to my swap thread above were I mentioned the speedo gear change.
Just make sure to grab the TCU and all the harnesses that are attached to the transmission. My link shows you everything you need. Really, figuring out how I was going to work the TPS and which transmission mount to use were the hardest parts of the job. The rest of it was just about crimping wires.
Edited by CamJam - Jul/13/2022 at 12:11pm |
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD |
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