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What transmission is in a 1988 Ford F-250 7.3l diesel?

A 1988 Ford F-250 with the 7.3L diesel engine would most likely have one of these transmissions:

* ZF S5-43 - This was the standard transmission for the 1988 model year. It was a 5-speed manual transmission.

* Ford C6 - This was an optional automatic transmission, although it was less common in the 7.3L diesel trucks.

To be absolutely sure what transmission you have, you'll need to:

1. Check the VIN: The VIN (Vehicle Identification Number) can be used to look up the exact specifications of your truck.

2. Inspect the transmission: Look at the transmission itself. The ZF S5-43 has a specific pattern on the shifter, and the Ford C6 is a larger, more prominent unit.

Let me know if you have the VIN, and I can help you determine the transmission!