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Old 06-04-2018, 08:33 AM   #11
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Originally Posted by 86Scotty View Post
Nothing, I have swapped from 3:31 open diff to 3:73 LSD myself. It's a magic combination. No one has a fix for the speedo and convenience display (range, mpg, all that stuff) because vehicle reads it from the ABS module instead of the ECU or some such modern car nonsense. You'll have to deal with a speedo that's off and hand calculate your mileage. Everyone is upsizing the tires on their Transit though so everyone is dealing with it.
With 245/75-16"s my speedo is off right at 7mph at freeway speed. I've gotten used to it.

heya 86Scotty

Torn about 3.31 vs 3.73

I was leaning towards the 3.31 - so it was quieter cruising on the hyway. We'd be doing mostly that.

any thoughts?

will be getting 3.5 EcoBoost and LSD for sure. :-)
thanks

john

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Old 06-04-2018, 10:24 AM   #12
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3.31 is fine with the EcoBoost if you aren't towing heavy. It won't affect noise since the engine isn't the noisy part anyways, but it might net you 1 MPG.
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