ZF S6-650 transmission

The ZF S6-650 is a 6-speed manual transmission manufactured by ZF Friedrichshafen AG. It is designed for longitudinal engine applications, and is rated to handle up to 705 newton metres (520 ft·lbf) of torque.

General Motors used the S6 as RPO ML6.

Gear ratios:

L	1	2	3	4	5	R
5.79	3.31	2.10	1.31	1.00	0.72	5.23

Applications

• 2001–2006 Chevrolet Silverado 2500HD and 3500
• 2001–2006 GMC Sierra 2500HD and 3500
• 1999–2010 Ford Ford Super Duty F-250, F-350, F-450 & F-550
  • 6.0 qt. mercon 5 or xt-m5-qs

Significance

This transmission will likely mark the last manual transmission GM and Ford will use in their heavy pick ups, due to the advancements made in Automatic transmission technology and the low consumer demand of manual transmissions.

Construction

ZF first introduced the S6-650 in 1998 on the Ford Super Duty. ZF S6-650 – Heavy Duty 6 speed manual transmission has an aluminum alloy main gear case and tail housing with the bell housing integral to the case. The ZF S6-650 is built in both a 2 wheel drive and 4 wheel drive versions with a diesel design only. The S6-650 has an internal oil pump to circulate and cool the lubricant which is uncommon to a manual transmission. All gears on the S6-650 are synchronized with a dual cone synchronizer in 2nd and 3rd gears with an input torque rating of 520 ft-lb.

GM started using the ZF S6-650 in 2001 with some improvements making this 6 speed transmission different from the Ford version.^{[citation needed]}

See also

• list of ZF transmissions

References

http://www.mackstrans.com/ZFID.html

http://www.autoworld.com/news/gmc/zf_s6_650.htm