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lci 8 speed box jolt

Discuss your latest mods or ideas, and anything to do with the BMW X5 (E70).
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jasonh1
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lci 8 speed box jolt

Post by jasonh1 » Mon Feb 28, 2022 12:04 pm

Hi all, when i select drive it takes a few seconds to engage and jolts, other than that its perfectly fine going through the gears and selects reverse ok aswell. Any advice would be helpfull,
x5 e70 40d
Regards jason

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StuBeeDoo
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lci 8 speed box jolt

Post by StuBeeDoo » Mon Feb 28, 2022 1:21 pm

When was the last time the transmission was serviced?
October 2012 build X3 30d SE, Bluewater.  Now with Webasto sunroof and paddle-shift   8)
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X5Sport
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lci 8 speed box jolt

Post by X5Sport » Mon Feb 28, 2022 5:31 pm

That would be my suggestion too. My 8sp was becoming a little jerky on certain smooth surfaces at low speed and the changes weren’t very good either, especially when cold. I had a full transmission service done just before Xmas (11 years and 53,000 miles) and it completely rejuvenated the system. Smooth as silk now. Cost was just under £900 for both diffs, transfer box and gearbox. Yours should be cheaper as you don’t have the torque distribution rear diff (special and expensive fluids).
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jasonh1
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lci 8 speed box jolt

Post by jasonh1 » Tue Mar 01, 2022 9:54 am

Hi yes it was serviced 2 years ago but the strange thing is its not doing it today ??
I will have it checked over anyway and post the results,

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Gcguru
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lci 8 speed box jolt

Post by Gcguru » Wed Apr 20, 2022 8:18 pm

The lag in those zf units is usually caused by slow fill times in clutch packs and pistons, but definitely improves after a fluid change as additives will swell up seals a bit and help out, as long as you catch it before trans cooks itself. Worthwhile to replace the 4 transfer tubes between mechatronics and case during service, as they compress and leak after 100k. Dont forget to initiate clutch adaptation relearn after any service or things may not improve much. Applying latest programming files also important and can be done any time.

jasonh1
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lci 8 speed box jolt

Post by jasonh1 » Wed Jun 08, 2022 10:44 am

thanks for the advice but upto now its running like a dream

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