# Ford taurus transmission problem when shifting from first to second **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** ford, taurus\ **Created:** [April 26, 2017, 5:48am UTC](https://community.cartalk.com/t/ford-taurus-transmission-problem-when-shifting-from-first-to-second/103326 "2017-04-26T05:48:51Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![samaha1977](https://avatars.discourse-cdn.com/v4/letter/s/58956e/32.png) [@samaha1977](https://community.cartalk.com/u/samaha1977)\ **Post date:** [April 26, 2017, 5:48am UTC](https://community.cartalk.com/t/ford-taurus-transmission-problem-when-shifting-from-first-to-second/103326/1 "2017-04-26T05:48:51Z")
I have a problem with my Ford Taurus model 1996 , I had several problem with my transmission and engine. I had o change both with a higher model engine ( 1999 model and transmission ) but after doing that , while driving , I have a transmission problem when shifting from first to second shift specially when I am trying to accelerate .The car seems to jump while shifting . What should I do ? Is it a VSS problem or it might be something else . Thanks to help ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [April 26, 2017, 2:19pm UTC](https://community.cartalk.com/t/ford-taurus-transmission-problem-when-shifting-from-first-to-second/103326/2 "2017-04-26T14:19:19Z")
When you swapped-in the newer engine and transmission, did you also install the ECM and the TCM for the new engine and transmission? If not, then the problem is probably the result of a communication problem between the 1996 ECM/TCM and the 1999 engine and transmission. ---
**Author:** ![samaha1977](https://avatars.discourse-cdn.com/v4/letter/s/58956e/32.png) [@samaha1977](https://community.cartalk.com/u/samaha1977)\ **Post date:** [April 26, 2017, 2:49pm UTC](https://community.cartalk.com/t/ford-taurus-transmission-problem-when-shifting-from-first-to-second/103326/3 "2017-04-26T14:49:07Z")
Yes I did change the ECM /TCM ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [April 28, 2017, 12:15am UTC](https://community.cartalk.com/t/ford-taurus-transmission-problem-when-shifting-from-first-to-second/103326/4 "2017-04-28T00:15:21Z")
The transmission has to know the vehicle speed to work correctly, so it could be a faulty vss. But I doubt it. run the service manual tests on that part. If it tests ok, I think you are probably looking at taking advantage of the warranty that came with the replacement transmission and getting another one installed.