Re: Ultramatic gearbox problem slipping direct drive clutch
Posted by humanpotatohybrid On 2024/7/7 21:34:55
Quote:
That's the thing. You can't shift from low to high "under load" in a first gen Ultramatic. No way José. Unless you want your high range clutches to end up resembling that marshmallow you dropped in the campfire as a kid. 😂
By the way George, it's good you did the pressure test. Without it, I would have suggested that your converter bushings are worn out, as that's a common issue that causes this problem. That would have sent you in the whole wrong direction.
Of course, if one is to read the factory literature, this point was emphasized heavily. One anecdote they gave was a car that had several transmission parts replaced, and even the carburetor rebuilt (keep in mind this was a nearly new car), only to find after the pressure tests, some leakage in the reverse servo causing low overall pump pressure and hence the various symptoms. A new servo and pair of tubes and it worked good as new.
53 Cavalier wrote:
If you're shifting from Low to High, under heavy load and too aggressively, you may find that your Ultramatic will become a Problamatic!
That's the thing. You can't shift from low to high "under load" in a first gen Ultramatic. No way José. Unless you want your high range clutches to end up resembling that marshmallow you dropped in the campfire as a kid. 😂
By the way George, it's good you did the pressure test. Without it, I would have suggested that your converter bushings are worn out, as that's a common issue that causes this problem. That would have sent you in the whole wrong direction.
Of course, if one is to read the factory literature, this point was emphasized heavily. One anecdote they gave was a car that had several transmission parts replaced, and even the carburetor rebuilt (keep in mind this was a nearly new car), only to find after the pressure tests, some leakage in the reverse servo causing low overall pump pressure and hence the various symptoms. A new servo and pair of tubes and it worked good as new.
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