I have a 2005 s type 4.2
when I take off and the car shifts from 1st to 2nd it shifts really hard. After that it shifts smooths as butter.
Even if I start off really easy it shifts hard from 1st to 2nd. The Tranny doesn't slip no noise is noticed

Any ideas thanks.

 

google
"the lurch"

I think it's in the FAQs but it's all over the forum in any case.

But - that only applies if your car is running right i.e. closed loop, good fuel trims, no misfires etc.

 

The transmission software may just need to be reset to default.
Sometimes they develop a bad learn from a unique sequence of events.

you could drive it differently for a day or two to see if there is any difference.

 

so driving it differently will reprogram the software? sorry to sound like a newbie.

 

Don't count on it!!

 

Thanks guys will unhooking the battery for alittle bit reset it? Or will unhooking it mess things up?

 

It will just mess things up. It will not clear the tranny at all. Do the google thing and lots of reading

 

It learns the way we drive and sets shift patterns accordingly.
As an example when I take my wifes 04 xj8 out for gas, the shifts can be slightly mushy.
After a few brisk hard accelerations it changes slightly to accomodate my style.
Not a huge difference but enough to be noticed.

In the OP case, he could start to see a difference. Mybe enough to give it more time and avoid getting it reset to default at the dealer. ($$)

 

Hi Achysklic, I am wondering if you ever got your hard shift 1-2 resolved? I have a 2004 XK8 with this exact same thing. It isn't the downshift lurch from 2-1, but upshift from a stop from first into 2nd. All other shifts are perfect. I had the fluid/pan/filer changed by the dealership to stop the bark sound from 3-4 (and BTW, the dealer said that didn't fix it, so they found a bottle of the anti-bark additive from another dealer, and that did fix it), but this didn't fix the hard shift 1-2. I tried pulling the negative battery cable and touching it to the positive (left like that for 2 hours) and then doing the "adaptive reprgramming" driving sequence discussed within the forum, and that had zero effect. I hope someone has a definitive resolution to this. I don't want to pay the dealer for their troubshooting, rather point then to a TSB or something. Also, no codes or anything.

 

Does the 2004 XK8 use the same gearbox (ZF 6HP26)?

 

Yes, it is the same transmission.