95 Buick LeSabre V6 3.8L Low Speed Shuddering
#11
New thought: The problem could be a bad vacuum modulator on the transaxle. It would be an inexpensive and easy part to replace to see if it fixes it and/or further the diagnosis and/or rule out the vacuum modulator. First thing I'd do is take the vacuum hose off of it and see if transmission fluid runs out of it. If it does then likely there'* your problem, or at least there'* something that needed fixing anyways.
I look forward to any feedback/thoughts on this.
#12
First thing I'd do is take the vacuum hose off of it and see if transmission fluid runs out of it
#13
Pressure tests all checked out. I thought minimum range pressure test for D1 was wrong but it may of been my helper selecting the wrong gear. Upon testing it a second time it checked out. Pressure is good, no fluid came out of the vacuum modulator. It would appear from my limited knowledge that the transmission has an internal issue unless someone can think of something else I should be testing before throwing in the towel.
#14
Senior Member
True Car Nut
You could try driving it with the vacuum hose temporarily disconnected from the modulator (and plugged) and see if there is still slip there. Don't do this for long though, the transaxle will think you are at full throttle all the time.
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