S6-S650F

The S6-S650F is a 6 speed manual transmission, and ten remanufactured units are listed here, all for Ford F-series trucks between 1999 and 2010. Every listing is described as ZF Built, with front and rear cases and an integral bell housing,. These are exchange units, also listed under Transmissions.

What fits what

Split the range by engine first. The 7.3L units are 1999-2000 F-series in 4×4 and 2WD, 2001-2003 F-series in 4×4 and 2WD, a 2003 F-series unit and a 2008-2010 F-series unit. The 5.4L and 6.8L units are 2002-2004 F-series, 2002-2007 F-series, 2003-2009 F-series and 2008-2010 F-series. Three listings are additionally marked High Torque: the 2001-2003 7.3L 4×4, the 2001-2003 7.3L 2WD and the 2003 7.3L.

How to identify yours

The Hollander number is the cleanest match. 1999-2000 7.3L 4×4 is 400-03384 and 2WD is 400-03383. 2001-2003 7.3L 4×4 is 400-03752 and 2WD is 400-03751. The 2003 7.3L is 400-00662 and the 2008-2010 7.3L is 400-00488. On the gas side, 2002-2004 is 400-00661, 2002-2007 is 400-04053, 2003-2009 is 400-04054 and 2008-2010 is 400-00486.

Two mechanical details also separate units where they are recorded. Output shaft spline count is listed as 24 Spline on the 2002-2004 5.4L and 6.8L and the 2001-2003 7.3L 4×4, and as 34 Spline on the 2003 7.3L and the 2003-2009 5.4L and 6.8L. Shifter stub bolt count is listed as 6 Bolt on the 2002-2007 and 2003-2009 units and 4 Bolt on both 2008-2010 units.

ID numbers come in two forms on these listings, a 1319-050 series number and a Ford style code. Examples: 1319-050-044 with 2C34-BB, 2C34-HA, 2C34-HC and 2C3Z-HCRM on the 2002-2004 unit, and 1319-050-084 and 1319-050-086 with 7C34-NB, 7C34-NC and 7C3Z-NRM on the 2008-2010 7.3L. One caution on the source data: the gear ratio field on all ten reads “5:79 Low-0:72 Gear Ratio”. Treat that field as unreliable and confirm by ID or Hollander number.

Core charge and warranty

Remanufactured exchange units. A refundable core charge may apply; no core amount is published, so call for it. A 6-month limited warranty is standard, and a 7-year / 1,000,000-mile extended warranty and a core fee waiver are available on request for qualifying remanufactured units, arranged at the time of purchase and not automatic. See the remanufacturing process and the warranty page. Call 216-250-6666 or email sales@varietyengines.com.