2.66 or 2.97 Magnum XL - Mustang Evolution

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Old 11-23-2014, 11:30 PM   #1
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2.66 or 2.97 Magnum XL

I have 3.73 gears and I am looking into purchasing a magnum XL transmission from Tremec. I have had many problems with my MT-82 and I'm basically wanting this transmission for longevity and reliability. So, because of this, which transmission ratio with 3.73 gears will give me the lowest RPMs overall? This car is my daily driver so I'm more concerned with fuel economy. For example, I'd prefer spinning at 1700 RPMs at 70 MPH vs 2100 RPMs. Which transmission will achieve this PRINCIPLE? Thanks for any help!

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Old 11-24-2014, 12:19 PM   #2
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I've looked into this swap and i believe you will want the 2.66 first gear otherwise first becomes useless ! I don't remember the final drive on that transmission but with 3.73 your going to spinning a bit higher no matter what !

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Old 11-24-2014, 01:03 PM   #3
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No go with the 2.97 it's a longer gear ratio. I have the same tremec 2.97 and 3.73 gears. At 60 mph= roughly 1800 rpm. I'm seeing 30mpg with this ratio. On the highway with cruise control. But I also have a 3v 4.9l

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