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Re: 6.4L Has Aluminum Heads!
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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
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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
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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
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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.
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