# Thud and jolt when car shifts gears

**URL:** <https://community.cartalk.com/t/thud-and-jolt-when-car-shifts-gears/41502>\
**Category:** Maintenance/Repairs\
**Tags:** outback, subaru\
**Created:** [December 30, 2009, 2:06am UTC](https://community.cartalk.com/t/thud-and-jolt-when-car-shifts-gears/41502 "2009-12-30T02:06:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![riverwoman](https://avatars.discourse-cdn.com/v4/letter/r/a3d4f5/32.png) [@riverwoman](https://community.cartalk.com/u/riverwoman)\
**Post date:** [December 30, 2009, 2:06am UTC](https://community.cartalk.com/t/thud-and-jolt-when-car-shifts-gears/41502/1 "2009-12-30T02:06:41Z")

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My 2006 Subaru Outback with 15,000 miles has begun to thud and jolt when the automatic transmission shifts from second to third in very cold weather (under freezing). Once the engine warms up it runs perfectly. The Service Dept can find no codes to explain this. Any suggestions?  
  
 Thank you.

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**Author:** ![pleasedodgevan2](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@pleasedodgevan2](https://community.cartalk.com/u/pleasedodgevan2)\
**Post date:** [December 30, 2009, 5:51am UTC](https://community.cartalk.com/t/thud-and-jolt-when-car-shifts-gears/41502/2 "2009-12-30T05:51:44Z")

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If it were a 75 Impala, I would tell you that the transmission had too much fluid in it and it was interfering with the modulator valve. No vacuum operated modulator today so… NEXT!