Thread: engine swapping
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Old 02-15-2011, 07:53 PM   #10 (permalink)
Frank Lee
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Join Date: Jan 2008
Location: up north
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Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
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Quote:
the main reason I have problems with gas mileage is pontiac did a final gearl ratio for the GTs at 3.29 where the GTPs had 2.93. My wifes 03 Impala has 3.05 and gets awesome gas mileage.
If this is the case then you have answered your own question. Swap transmissions or just the final drive gears instead.

Add me to the chorus saying a swap away from a 3.8 likely will be more trouble than it's worth.
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