# '95 Buick Park Ave won't stay in overdrive

**URL:** <https://community.cartalk.com/t/95-buick-park-ave-wont-stay-in-overdrive/47988>\
**Category:** Maintenance/Repairs\
**Tags:** buick\
**Created:** [April 26, 2010, 10:30am UTC](https://community.cartalk.com/t/95-buick-park-ave-wont-stay-in-overdrive/47988 "2010-04-26T10:30:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![nowmaybe](https://avatars.discourse-cdn.com/v4/letter/n/8edcca/32.png) [@nowmaybe](https://community.cartalk.com/u/nowmaybe)\
**Post date:** [April 26, 2010, 10:30am UTC](https://community.cartalk.com/t/95-buick-park-ave-wont-stay-in-overdrive/47988/1 "2010-04-26T10:30:37Z")

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Once my Park Ave has shifted into overdrive or fourth gear it will run down the interstate at 70 MPH at under 2000 RPM. (It will also get a great 30 MPG, but that’s not the issue.) Problem is if I step down on it to pass from say 55 to 65 and it shifts out of OD it will not shift back into OD regardless of whether or not I lift my foot completely off the gas. I can’t think the tranny is shot. There is no check engine light on. What’s causing this?

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**Author:** ![missileman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/missileman/32/1366_2.png) [@missileman](https://community.cartalk.com/u/missileman)\
**Post date:** [April 26, 2010, 2:06pm UTC](https://community.cartalk.com/t/95-buick-park-ave-wont-stay-in-overdrive/47988/2 "2010-04-26T14:06:27Z")

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Try clicking the OD switch off then back on. If it goes back into OD then it’s basically a minor problem but you will need a good transmission mechanic to fix it. Has the transmission filter and fluid been changed on a regular basis? transman?

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**Author:** ![nowmaybe](https://avatars.discourse-cdn.com/v4/letter/n/8edcca/32.png) [@nowmaybe](https://community.cartalk.com/u/nowmaybe)\
**Post date:** [April 26, 2010, 11:52pm UTC](https://community.cartalk.com/t/95-buick-park-ave-wont-stay-in-overdrive/47988/3 "2010-04-26T23:52:36Z")

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Dropping the gear selector down into straight drive and back to OD doesn’t make it go back into OD. Neither does coming to a complete stop and shifting into park and back. The fluid was changed 18 months and  
20K miles ago.

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**Author:** ![transman618](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/transman618/32/24_2.png) [@transman618](https://community.cartalk.com/u/transman618)\
**Post date:** [April 27, 2010, 1:53am UTC](https://community.cartalk.com/t/95-buick-park-ave-wont-stay-in-overdrive/47988/4 "2010-04-27T01:53:46Z")

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This is where a trans shop is going to need to come in because for some reason, either electronic or hydraulic, the 4th clutch doesn’t want to re-engage. Since it seems to happen after you kick it down that could be an indicator of something like a TPS. The only way to know if its internal or an external source is to have a trans shop check it out. Unless they can show you something definitive, make sure you get a second opinion.

transman