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The parts will only work if you use an oil pump that goes with the chosen shaft. In other words, one must use a 27 spline shaft with a pump made for 27 splines. And to use a 30 spline pump you must use pump made for 30 spline shaft. Then you run into the complication of 30 spline pumps are made for 1987 and newer transmissions which have an auxilary valve attached to the valve body surface. So you now have to go out an buy a 87 or newer trans case. Meanwhile the dollars are flying out of your wallet. Finally the torque converter is also matched to the input shaft. So to make a long story short. If you have a 82- 86 700r4 with a 27 spline shaft keep it the same, or if you 87 or newer 700r4 has a 30 spline shaft keep it.

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Q: Are the 30 spline and 27 spline input shafts interchangeable when rebuilding a 700r4 transmission?
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