# What causes a 250 rpm surge after 45-50 mph?

**URL:** <https://community.cartalk.com/t/what-causes-a-250-rpm-surge-after-45-50-mph/36836>\
**Category:** Maintenance/Repairs\
**Tags:** ram, dodge, 1500\
**Created:** [September 19, 2009, 2:28pm UTC](https://community.cartalk.com/t/what-causes-a-250-rpm-surge-after-45-50-mph/36836 "2009-09-19T14:28:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![joseph\_1313](https://avatars.discourse-cdn.com/v4/letter/j/c4cdca/32.png) [@joseph\_1313](https://community.cartalk.com/u/joseph_1313)\
**Post date:** [September 19, 2009, 2:28pm UTC](https://community.cartalk.com/t/what-causes-a-250-rpm-surge-after-45-50-mph/36836/1 "2009-09-19T14:28:43Z")

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I am wonder what can cause a 250 rpm jump after i hit 45-50 rpms

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**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\
**Post date:** [September 19, 2009, 2:43pm UTC](https://community.cartalk.com/t/what-causes-a-250-rpm-surge-after-45-50-mph/36836/2 "2009-09-19T14:43:36Z")

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It sounds like the torque converter lockup engaging/disengaging. The torque converter lockup on my 95 Dodge Dakota would engage at 47-48 mph.

Ed B.

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**Author:** ![joseph\_1313](https://avatars.discourse-cdn.com/v4/letter/j/c4cdca/32.png) [@joseph\_1313](https://community.cartalk.com/u/joseph_1313)\
**Post date:** [September 19, 2009, 2:59pm UTC](https://community.cartalk.com/t/what-causes-a-250-rpm-surge-after-45-50-mph/36836/3 "2009-09-19T14:59:38Z")

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Is the toque converter problem be seen in higher speeds as well. It jumps in speed as high as i can legally go. It jumps up 250 then falls to normal after a few seconds and jumps again 250 after a few more.