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Why is my 1985 Corvette jumping into neutral when you accelerate down the street?
Wiki User
∙ 17y ago
Not knowing any details of your transmission issue, I can only guess as to causes. Over the years, I have personnaly observed two instances of a transmission "jumping out of gear." The first instance involved a standard three speed manual transmission on a straight six engine. When driving in high or second gear, it would stay in gear so long as the engine and drive train was "loaded" under continuing acceleration. But when acceleration was eased off, the the transmission would jump out of gear, going into neutral. On disassembly of the transmission, the cause was determined to be a "disentegrated" SPRING for the detent ball. The second incident involved an automatic transmission on a V-8 enginge. Analysis eventually determined that one of the two farword engine mounts was "separated"/broken, and on "heavy" acceleration, the high torque rotated the engine just enough to pull on the gear selector linkage to cause it to be shifted into the neutral position. This was a "mystery" because everything "looked normal" under static conditions. It took the contribution of longtime mechanic to figure it out. He had us raise the hood to allow observation, put the transmission in drive with the engine running, and then with the brakes firmly applied, to gently, then moderately "rev" the engine. When we did so, the engine would "roll over," lifting the side of the engine which had the broken engine mount, allowing us to actually see the gap of the broken mount, and simultaneously, the transmission would go into neutral, allowing the engine to race until the accelerator was released! Since one end of the selector linkage was attached to the transmission shift arm, and the other to the shift lever attached to the body, the geometry would change with the torque rotation of the engine, "pulling" the transmission out of gear. I can imagine the linkage relationship cause in the second example, as being able to result in the same outcome with a manual transmission. My best guesstimate is that one of your engine mounts is broken, ESPECIALLY if you are prone to "neck snapping" acceleration. Hopefully one of these examples can assist in the diagnosis of your problem.
Wiki User
∙ 17y ago
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