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Transmission shifts hard sometimes

Old 03-23-2010, 03:46 PM
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Default Transmission shifts hard sometimes

I have a 2000 pontiac bonneville ssei and sometimes whenever I am driving it it shifts hard but most of the time it shifts smoothly. Is there something wrong with my transmission that it shifts hard sometimes? The transmission is an automatic.
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Old 03-23-2010, 03:53 PM
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Most likely a bad trans mount. Check them over. If the trans was bad I would expect it to happen all the time.
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Old 03-23-2010, 07:25 PM
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If it not the mounts look into converting to Dextron VI and installing a shift kit. 11 months ago I was convinced I needed to rebuild the trans, did the Dextron VI and the shift kit- and the trans is running better every day- 30k miles later.
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Old 03-23-2010, 08:30 PM
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If it engages into D and R hard to it could be a vacuum problem. I had hard engagement into D and R also 1-2 shifts were pretty hard and 2-3 shifts a little harder than normal. after a brief look under hood I found vacuum line had been totally knocked off trans. Stuck it back on fine ever since.
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Old 03-23-2010, 10:55 PM
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The 2000 Bonneville does not have a vacuum modulator. You may have a bad pressure control solenoid. Scan for codes and report back.
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Old 03-24-2010, 12:32 PM
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Thanks for the info I'l have to remember that
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Old 03-24-2010, 12:34 PM
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Remember, not all transmission codes will set a SES light.
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Old 03-24-2010, 06:28 PM
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Originally Posted by Danthurs View Post
Remember, not all transmission codes will set a SES light.
Correct, especially P1811, which is a pressure control solenoid related code.
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