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      08-28-2021, 08:28 PM   #2
Brian86
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Drives: e36 M3, e91 325xi, N50 Xterra
Join Date: Dec 2020
Location: Pittsburgh

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That's kind of a unique problem. My first instinct is to blame it on the transfer case... but the wet clutch mechanism shouldn't cause 'surging' or 'binding' even if it's grabbing somewhat erratically. The computers are usually really good at picking up T-case actuator problems.

To clarify, the car drives perfectly normally with the front driveshaft removed? That would suggest the surging/stepping isn't related to the engine or transmission.

Is there fluid in the transfer case?

How does the front diff feel. You should be able to feel something just operating it by hand if it's that far gone.

Is it possible the rear diff was changed out to one with a different ratio?

I dunno, just kinda throwing out ideas.
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