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Another difference you might find is the size of the front bearing retainer. Late-model units use the smaller retainer that's 4.685 inches in diameter (on the right). Truck and van transmissions used a larger retainer that won't fit in a standard clutch/bellhousing assembly. If you happen to get a transmission with the larger retainer, you can save a buck by cutting the flange side down in a lathe instead of going out and buying a new one.