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5. The new transmission is longer than the stock automatic unit, so the stock driveshaft will no longer fit. It usually takes a day or two to get a new driveshaft cut, so AP’s Gray Fredrick (left) and Daniel Silcox (right) mock up the bellhousing and transmission (without the clutch) so that they can get the correct measurement for the driveshaft and have a new one ordered up. Whenever you measure for a new driveshaft, make sure the rear end housing is sitting at ride height.