I feel that I should point something out here for all you 123 diesel modifiers.

The early 123 diesels (77 to about 80) have different manual transmissions, thus different bolt patterns on the transmissions than the late 123 diesels (about 80 'til the end of the series.) For this reason you need to make sure that you use the adapter plate for the transmission that you are using. This adapter plate bolts to the engine with four bolts that require flywheel removal to access. Then the transmission bolts to this plate.

Even the incorrect adapter will bolt up by leaving out a few bolts, but will not accurately center the transmission. This COULD cause pilot bearing problems and rapid input shaft bearing wear.

Have a great day,