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The A670 does not have a transmission computer. There would be a significant amount of wiring to put the A604 in.
Honestly, I never saw any significant difference with the 3.0 with an A604 vs. A670. What the A604 gained on the open road, it sucked up power wise from the 3.0 in town. If the MPG difference is as great as you say, it may be something other than the transmission causing the low MPGs. The EPA rated the same highway MPG and only 1 MPG different in town between the two transmissions.
 
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