axle ratio and fuel mileage

2000 FORD E-SERIES VAN
126,000 MILES
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TAWOLFORD
  • MEMBER
  • 2 POSTS
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 1:33 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
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 22, 2013 at 7:38 PM
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TAWOLFORD
  • MEMBER
  • 2 POSTS
I thought I could change my cam timing with an offset keyway? Thanks Tom
May 8, 2013 at 2:06 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
no, leave it alone

roy
May 8, 2013 at 9:47 AM
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