axle ratio and fuel mileage

2000 FORD E-SERIES VAN
126,000 MILES
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TAWOLFORD
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what axle ratio would be the best for fuel mileage in my 2000 E150 AUT0MATIC OD transmission. i was thinking around a 3:08 it now has a 3:55.
would i have to advance my cam timing in my 5.4 engine or is it already advanced?
would i have to change my shift points in my computer?
any other information would be very much appreciated.
thanks tom
Apr 22, 2013 at 8:33 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
2.83 is a good rear for highway

Cannot change cam timing.

cannot change shift points.

it is a big vehicle, not much more can be done

Roy
Apr 23, 2013 at 2:38 AM
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TAWOLFORD
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I thought I could change my cam timing with an offset keyway? Thanks Tom
May 8, 2013 at 9:06 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
no, leave it alone

roy
May 8, 2013 at 4:47 PM
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