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LIFETIME CONTRIBUTOR
2006-2009 Range Rover Sport
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11,015 Posts
Yup, that's "normal" behavior of our ZF 6HP26 tranny, it won't upshift from first gear until very high engine revs when driven uphill with a cold engine, causing the "jerk" you notice as you touch the gas pedal... Symptom disappears when the engine warms up. Something about the transmission "Gradient Mode Strategy" (don't ask...), supposedly corrected on MY08s and later. It's documented on the ZF's troubleshooting guide uploaded here: download/file.php?id=1415

I also live on a fairly steep hill and experience that same occasional jerk and hesitation at times, as I leave my house with a cold engine in the morning and drive uphill. No worries. :thumb:
 
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