Ford 6R transmission

The 6R is a six-speed

The 6R 80 was available in 2009–2017 Ford F-150 trucks (and 2018–2020 only paired with the 3.3L V6 engine). It features an integrated "Tow/Haul" mode for enhanced engine braking and towing performance. For the 2011 model year, the transmission was revised to provide smoother shifts, improved fuel economy, and overall better shift performance. Most notable of the improvements was the addition of a one-way clutch that provided smoother 1–2 up-shifts and 2–1 down-shifts. The transmission has a relatively low 1st gear and two overdrive gears, the highest of which is 0.69:1. This provides exceptional towing performance when needed, while maximizing fuel economy by offering low engine speeds while cruising.

The 6R 80 can be found behind the 3.7L V6 all the way up to the 6.2L V8. Ford has stated that while the transmission is used in multiple applications, each transmission is optimized and integrated differently depending on the engine it is mated to. The 6R 80 features "Filled for Life" low viscosity synthetic transmission fluid (MERCON LV), though a fluid flush is recommended at 150,000 miles if your truck falls under the classification of "Severe Duty" operation. The transmission, as used in the Ford F-150, has a fluid capacity of 13.1 quarts and weighs 215 lbs.

Specifications

Basic concept

A conventional planetary gearset and a compound Ravigneaux gearset is combined in a Lepelletier gear mechanism,^[2] to reduce both the size and weight. It was first realized with the 6HP from ZF Friedrichshafen. Like all transmissions realized with Lepelletier transmissions, the 6R also dispenses with the use of the direct gear ratio, making it one of the very few automatic transmission concepts without such a ratio.

It also has the capability to achieve torque converter lock-up on all six forward gears, and disengage it completely when at a standstill, significantly closing the fuel efficiency gap between automatic and manual transmissions.

Technical data

Gear Teeth and Ratios[a][b][c]		Planetary Gearset: Teeth[d] Lepelletier Gear Mechanism			Count	Total	Avg.
		Simple	Ravigneaux
Model	Version First Delivery	${\displaystyle {S_{1}}}$[e] ${\displaystyle {R_{1}}}$[f]	${\displaystyle {S_{2}}}$[g] ${\displaystyle {R_{2}}}$[h]	${\displaystyle {S_{3}}}$[i] ${\displaystyle {R_{3}}}$[j]	Brakes Clutches	Ratio Span	Gear Step
Gear	R	1	2	3	4	5	6
Step ${\displaystyle i_{n-1}/i_{n}}$	–R : 1		1 : 2	2 : 3	3 : 4	4 : 5	5 : 6
6R 60 6R 80	600 N⋅m (443 lb⋅ft) 800 N⋅m (590 lb⋅ft)	37 71	31 38	38 85	2 3	6.0354	1.4327
Ratio ${\displaystyle i_{n}}$	−3.4025 ${\displaystyle -{\tfrac {4,590}{1,349}}}$	4.1708 ${\displaystyle {\tfrac {9,180}{2,201}}}$	2.3397 ${\displaystyle {\tfrac {211,140}{90,241}}}$	1.5211 ${\displaystyle {\tfrac {108}{71}}}$	1.1428 ${\displaystyle {\tfrac {9,180}{8,033}}}$	0.8672 ${\displaystyle {\tfrac {9,180}{10,586}}}$	0.6911 ${\displaystyle {\tfrac {85}{123}}}$
Step	0.8158		1.7826	1.5382	1.3311	1.3178	1.2549
6R 140	1,400 N⋅m (1,033 lb⋅ft)	49 95	37 47	47 97	2 3	5.8993	1.4261
Ratio ${\displaystyle i_{n}}$	−3.1283 ${\displaystyle -{\tfrac {13,968}{4,465}}}$	3.9738 ${\displaystyle {\tfrac {13,968}{3,515}}}$	2.3181 ${\displaystyle {\tfrac {8,148}{3,515}}}$	1.5158 ${\displaystyle {\tfrac {144}{95}}}$	1.1492 ${\displaystyle {\tfrac {13,968}{12,155}}}$	0.8585 ${\displaystyle {\tfrac {13,968}{16,271}}}$	0.6736 ${\displaystyle {\tfrac {97}{144}}}$
Step	0.7872		1.7143	1.5293	1.3190	1.3386	1.2744
ZF 6HP all[k]	2000	37 71	31 38	38 85	2 3	6.0354	1.4327
Ratio	−3.4025	4.1708	2.3397	1.5211	1.1428	0.8672	0.6911
Step	0.8158		1.7826	1.5382	1.3311	1.3178	1.2549
Ratio R & Even	${\displaystyle -{\tfrac {R_{3}(S_{1}+R_{1})}{R_{1}S_{3}}}}$	${\displaystyle {\tfrac {R_{3}(S_{1}+R_{1})(S_{2}+R_{2})}{R_{1}S_{2}(S_{3}+R_{3})}}}$		${\displaystyle {\tfrac {R_{2}R_{3}(S_{1}+R_{1})}{R_{2}R_{3}(S_{1}+R_{1})-S_{1}S_{2}S_{3}}}}$		${\displaystyle {\tfrac {R_{3}}{S_{3}+R_{3}}}}$
Ratio Odd	${\displaystyle {\tfrac {R_{2}R_{3}(S_{1}+R_{1})}{R_{1}S_{2}S_{3}}}}$		${\displaystyle {\tfrac {S_{1}+R_{1}}{R_{1}}}}$		${\displaystyle {\tfrac {R_{3}(S_{1}+R_{1})}{R_{3}(S_{1}+R_{1})+S_{1}S_{3}}}}$