6.4L Has Aluminum Heads!

[ProCharger]

The TorqShift is really two transmissions in one case. The front transmission has the OD gearset. It has two ratios, 1:1 and 0.71:1. The rear transmission has three ratios, 3.09:1, 1.538:1, and 1:1.

First gear is 1 x 3.09 = 3.09:1
Second gear is .71 x 3.09 = 2.20:1
Third gear is 1 x 1.538 = 1.538:1
Fourth is the one that isn't used much, it is .71 x 1.538 = 1.09:1
Fifth is 1 x 1 = 1:1
Sixth is .71 x 1 = .71:1

Basically it is a 3 speed tranny with a high and a low side to each gear. Each of the 3 gears uses both the low and the high side to achieve it's final ratio.

Just do a search on here going back a year or so and you will find some info. on it. Search something like "6 forward gears" in paranthesis.

[OILBURNER350]

Back on topic, the 6.4 may have the same aluminum piece that they bolt to the heads on the 6.0s. They have been doing that to reduce NVH emissions.

[cut7]

Procharger is correct. It is a three speed with an overdrive used as a ratio splitter. What I don't understand is why Ford didn't spread out the ratios to make 4th (2nd * overdrive) more useful; at 60 mph the difference between 4th & 5th is only 9%. That means that if your were going 2600 rpm in 4th, a shift to 5th would only drop you to 2385 rpm, not enough to be useful. What Ford should have done is made the 1st & 2nd gearsets lower, then the ratios would be more spread out. An example follows:

1st = 3.94:1
2nd = 2.79:1 (3.94*.71)
3rd = 1.98:1
4th = 1.41:1 (1.98*.71)
5th = 1:1
6th = .71:1

This would give us 6 equally spaced forward gears. An added benefit is that 1st would be 27% lower (more grunt for pulling boats out of the water or a toy hauler up a steep incline) whilst maintaining the good highway mileage of a 3.73 rear end. It would be lower — by 15% — than the current first gear with 4.11 gears in the rear end (see chart below).

3.09*3.73 = 11.53
3.09*4.11 = 12.70
3.94*3.73 = 14.70

[drford]

[ QUOTE ]
5-speed TorqShift automatic overdrive (all)
Gear Ratios
I 3.11:1
II 2.22:1
III1.55:1
IV 1.00:1
V 0.71:1

[/ QUOTE ]

THIS IS WRONG . THE FOLLOWING IS RIGHT OUT OF THE FORD SERVICE MANUAL

FIRST 3.09 TO 1
SECOND 2.2 TO 1
THIRD 1.583 TO 1
FOURTH 1.096 TO 1 **
FIFTH 1 TO 1 **
SIXTH 0.712 TO 1 **
REVERSE 2.88 TO 1

** = SPECIAL OPERATING CONDITIOND DETERMINED BY PCM/ TCM IN TOW HAUL OR NORMAL MODE TRANS WILL SHIFT AS FOLLOWS BELOW 15 DEG C IT WILL SHIFT 1,2,3,5,6 IF ABOVE 15 DEG C IT WILL SHIFT 1,2,3,4,6 .THE TORQUE SHIFT DOES HAVE 6 GEARS BUT DOES ONLY USE 5 DETERMIEND BY TRANS OPERATING TEMP AND DEMAND OF THE TRANS SO FOR THOSE WHO SAY IT IS A FIVE SPEED THEY ARE PARTIALLY CORRECT . ALSO THE 6SPD ALLISON BEHIND THE DURAMAX ALSO SHIFTS THE SAME WAY
HOPE THIS CLEARS THINGS UP SORRY FOR THE CAPS JUST GETTING THE CORRECT FACTS ACCROSS



CHEERS GUYS [img]/ubbthreads/images/graemlins/cool.gif[/img] [img]/ubbthreads/images/graemlins/smokin.gif[/img]

[Casey_1]

[ QUOTE ]
5-speed TorqShift automatic overdrive (all)
Gear Ratios
I 3.11:1
II 2.22:1
III1.55:1
IV 1.00:1
V 0.71:1

[/ QUOTE ]
These are correct for '05-'07.

Edit: copied these from my 2007 service manual:
1st: 3.114 to 1
2nd: 2.218 to 1
3rd: 1.545 to 1
4th: 1.096 to 1
5th: 1 to 1
6th: 0.712 to 1
Rev: 2.88 to 1

[ QUOTE ]
FIRST 3.09 TO 1
SECOND 2.2 TO 1
THIRD 1.583 TO 1
FOURTH 1.096 TO 1 **
FIFTH 1 TO 1 **
SIXTH 0.712 TO 1 **
REVERSE 2.88 TO 1

[/ QUOTE ]
These are correct for '03-04.

There was a ratio change for '05, and either the manual wasn't updated or you have an older one.

[Big K]

Ok, I think this whole thread is probably done.

It is WAY off topic now!

[69mach1377]

Probably my fault, but 1.09 vs. 1.00? Come on...who are we kidding. It's a five speed for all intents and purposes.

[Casey_1]

That's why Ford doesn't advertise that it's a six speed. It really has six ratios, but there are only five usable.

[toyboxrv]

The idea of changing the 3 ratios to make a useable 6 speed sounds good. I would not go as low as 3.94, more like 3.4, 1.7 and .85. That would space the gears evenly and end up with a .85 OD and a .60 OD. Would allow 4.30 gears for lower first and a reasonable 6th and 2000 rpm high speed cruising in 6th for 3.73 trucks.

To stay on topic, I've owned a few aluminum head engines and they all don't have guaranteed failure any more often than cast iron.

[mtomac]

They would have been better off spacing the gears or making 6th a second overdrive.

[klhansen]

[ QUOTE ]
Ok, I think this whole thread is probably done.

It is WAY off topic now!

[/ QUOTE ]

I agree. It has morphed into a tranny thread.

Time to start over.