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C4 low speed transfer case "roughness"


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I purchased an '89 Carrera 4 back in January and recently started having the following problems that I believe (hope?) are related: 


1. At low speeds (<40mph) it feels at though the center differential is having a difficult time determining which wheels (front/rear) to direct power. The engine runs perfectly, but the car will rhythmically hesitate/jerk forward while *slowly* accelerating. It's not enough to make the car un-drivable, but it is annoying. Under spirited acceleration, everything soothes out and the effect isn't noticeable at all. Once you reach 35-40mph or so the problem disappears.


2. At high speed (>70mph), the car vibrates almost exactly like it needs a high speed tire balancing. This started happening simultaneously with the first issue and seems too coincidental to not be related. 


Can anyone give me an idea of what to check first? It the clutch pack hydraulically operated, and if so, is there a way to test the fluid level in the system?



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