4R100 Hard Shift
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Elder User
Joined: Oct 2008
Posts: 669
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From: Jacksonville, NC
4R100 Hard Shift
It's been a while since I last been on here, but I have an issue I can't quite figure out and none of my searches seem to apply.
I have a hard shift between 2-3 that is somewhat violent. It doesn't matter the rpms or how hard I'm accelerating, it will always do it. At wot, it sometimes throws a code that stays on for a few minutes, then goes away. When I hook up a code reader, it shows no record of it and it never throws a blinking OD light ever.
It has an ATS transmission, but I don't know how the controller works, if it is wired correctly, or if it could even cause this issue.
Any ideas or other details you all need? Currently the truck has 210k and unknown on ATS.
I have a hard shift between 2-3 that is somewhat violent. It doesn't matter the rpms or how hard I'm accelerating, it will always do it. At wot, it sometimes throws a code that stays on for a few minutes, then goes away. When I hook up a code reader, it shows no record of it and it never throws a blinking OD light ever.
It has an ATS transmission, but I don't know how the controller works, if it is wired correctly, or if it could even cause this issue.
Any ideas or other details you all need? Currently the truck has 210k and unknown on ATS.
Thread Starter
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Elder User
Joined: Oct 2008
Posts: 669
Likes: 0
From: Jacksonville, NC
The check engine light sometimes comes on when I really get in it and it shifts hard, but when I go to read what engine code it threw, it has no record of it. Since it isn't flashing the OD light, it tells me it isn't a trans code being thrown, but the truck still notices that something isn't right.
After doing some research, the ATS controller (when on) is only supposed to change the torque converter clutch lock-up based on MPH. However, I haven't noticed a difference in the shifting when it is on vs when it is off.
After doing some research, the ATS controller (when on) is only supposed to change the torque converter clutch lock-up based on MPH. However, I haven't noticed a difference in the shifting when it is on vs when it is off.
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