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Discussion Starter #1
I've had a strange jump from my truck when feathering the brake to stop. Just before I'm fully stopped, once in a while there's a thunk and the truck lurches.

It's almost as though the transmission is grabbing a gear and trying to go.

The frequency of this happening is increasing, too.

Any thoughts?

'07 Classic 2500HD LBZ, stock except 285s.
 

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First off, how many miles on the truck?

Feathering? Are you on and off the pedal as you come to a stop?
 

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Discussion Starter #3
275,000 kms. That's about 170,000 miles.

Feathering = braking slowly, not stabbing them on for a panic stop. And steady braking, rather than pumping.
 

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Moved to drive train for better exposure.
 

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Just make sure you report back after you fix the problem. This always helps a lot of other people when you do this.:thumb:
 

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Discussion Starter #8
Just make sure you report back after you fix the problem. This always helps a lot of other people when you do this.:thumb:
For sure. I do have the steering wheel twitching to the left on some stops, which I found as a diagnosis for a bad driver's side sensor with the ABS triggering unnecessarily. I do get ABS pulsing on dry stops occasionally too.

As I understand it, the speed sensor also talks to the transmission, which could trigger the lurch?
 

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Discussion Starter #11
Just make sure you report back after you fix the problem. This always helps a lot of other people when you do this.:thumb:
Update: lubing the spline reduced it by 95%. Still get the odd hop.

Wheel sensors go in Oct. 8th.
 

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ABS lamp came on after new sensors in, but no code set. Go figure.

My mech had a hunch, so he swapped hubs side to side and the pull swapped with it, as well as the incongruent speed readings on his scanner.

Turns out the tuning gear in the hub (Delco about 4 yrs old) was hooped - new hub, she is fixed!
 

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ABS lamp came on after new sensors in, but no code set. Go figure.

My mech had a hunch, so he swapped hubs side to side and the pull swapped with it, as well as the incongruent speed readings on his scanner.

Turns out the tuning gear in the hub (Delco about 4 yrs old) was hooped - new hub, she is fixed!
Glad the issue is resolved.
Thanks for giving us an update!

:thumb:
 
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