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Old 02-12-2007, 04:47 AM
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modulator valve th350

i have an early 80s 350-350 the trans will not shift into third. night before was fine the next morning no shift. how do you check mod. thanx

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Old 02-12-2007, 05:28 AM
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Hook up a mighty vac (vacuum pump) to the mod and pump it to 20 inches, if it holds this for 10 minutes then the diaphragm is ok. If your mod is adjustable, use a depth gauge to check the plunger position and set it to match a non adjustable one.
If it only drops into 3rd when you lift off it could be 2/3 shift valve, stuck modulator valve (not mod itself) or governor,governor valve.
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