| MTLott | -- 12-21-2009 @ 11:00 AM |
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My buddy bought a '39 Fordor with a stock Chevy 283 in it attached to the flathead transmission. When replacing the transmission, we found shims (.005?) all the way around between the transmission bell and the adapter. We are still wondering what, if any, problem they were trying to shim away. All advice appreciated. Thank you and Merry Christmas.
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| supereal | -- 12-22-2009 @ 9:29 AM |
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That takes me back. One of the first "transplants" I did as a teenager was a '49 Olds "Rocket" into my '46 Ford sedan coupe when the flat six gave up. That was in the days when "store bought" engine to transmission adapters hadn't appeared. We made the adapter, and it fit, but the car had a serious vibration. We traced it to a misalignment between the engine and the transmission, and lessened the problem by inserting tin shims between the transmission and the adapter, then trying the thing to see which way to shim. Many of the shims were cut from some Prince Albert tobacco cans, which will date me, I'm sure.
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| MTLott | -- 12-22-2009 @ 12:48 PM |
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Many thanks. Was thinking also jumping out of gear as the result of a misalignment. Hard to "boresight" once the transmission is in the car unless you have a suggestion.
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| supereal | -- 12-22-2009 @ 6:09 PM |
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I don't know of an easy way, but loosening the transmission mounting bolts just a bit, then starting the engine and letting it idle while you work the clutch a few times will sometimes help center the input shaft, then tighten the bolts. Otherwise, it is a matter of shimming to see which way lessens the problem if the engine and transmission faces are not parallel. Out of center will cause shifting problems, such as jumping out of gear. Of course, the transmission may be badly worn, causing your problem, too.
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