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There are two different ways manual trannies can be adapted to engines. Since most bellhousings on manuals are removable, some adapters call for retaining the original tranny’s bellhousing and using a plate to adapt the bellhousing to the new transmission. This plate can vary in thickness to compensate for the length of the new tranny’s input shaft and to adjust the overall length of the transmission assembly. Other tranny conversions require using a whole new bellhousing that’s specially made for the application. The plate-style adapters are usually less expensive and cause fewer clutch linkage problems.