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Old 06-30-2021, 08:46 PM   #1
riversidemetro
 
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Exclamation 1990 D21 Automatic Shift Issues

Hello! Ive noticed that when im flooring it with overdrive on and off, the car refuses to shift unless i ease off the gas. why tf is it doing that, i cant win races like this lmao
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Old 07-01-2021, 02:21 AM   #2
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How is your fluid level?
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Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 07-01-2021, 02:40 AM   #3
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Fluid and filter change a good place to start, and inspect the pan for debris.


In the old days I'd say your kickdown needs adjustment. IDK on these ... because I have the five-speed 97% effective anti-theft transmission.
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Old 07-02-2021, 05:14 AM   #4
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I, like LugNut, row my own gears. But if your ATF fluid is dirty or low. The linkage won't be able to transfer the engine's power. So I would suggest draining and replenishing the ATF fluid, along with a new filter, and test drive the truck with and without the OD engaged, and see how it performs.
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Old 07-02-2021, 05:55 PM   #5
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It sounds like the kickdown cable might be loose. To a degree the transmission is supposed to do this... it'll shift harder and later with a heavy foot than under light acceleration. It's not hard to adjust but it's easy to mess up. Definitely get yourself a copy of the FSM before you do anything else. Too tight and it'll be slamming into gear. Too loose and it'll take too long to shift, eventually burning up the clutch packs in there.

Changing the fluid is never a bad idea if you don't know when it was last done. It's been my experience that once a transmission starts slipping or acting up the damage is already done and changing the fluid won't do anything to fix it. As long as it's shifting fine under normal driving and the fluid isn't burnt or gritty there probably isn't anything internally wrong with it.
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Old 07-03-2021, 02:35 PM   #6
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Quote:
Originally Posted by LugNut1990 View Post
Fluid and filter change a good place to start, and inspect the pan for debris.


In the old days I'd say your kickdown needs adjustment. IDK on these ... because I have the five-speed 97% effective anti-theft transmission.
Are you referencing to the engine oil and filter?
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Old 07-03-2021, 08:02 PM   #7
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Transmission's.
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Old 07-07-2021, 12:35 AM   #8
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Figure anything out? I have to ease off the gas to do every shift lol. 1995 VG30E Auto
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Old 07-07-2021, 12:55 AM   #9
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Quote:
Originally Posted by rojo View Post
Figure anything out? I have to ease off the gas to do every shift lol. 1995 VG30E Auto
Welcome Rojo... have you replaced the trans fluid and filter? Please do so and let us know if anything changes.
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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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