REAR END GEAR CHANGE

  • Tiny
  • specktruck
  • Ford F-150

I HAVE A 2000 F-150 4.6 V8 EXT CAB 8FT BED AND A 355 REAR END GEAR, FOR FUEL MILEAGE REASONS
WOULD YOU RECOMMEND REPLACING THE 355 WITH A 308 GEAR? WHAT IS THE DOWN SIDE OF CHANGING TO A 308?

THANKS
specktruck@hotmail. Com

Tuesday, January 2nd, 2007 AT 6:21 PM

3 Answers

  • Tiny
  • blackop555
  • Expert
  • 10,563 posts

Less high speed power and low end power, other then that not really.

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Saturday, January 5th, 2008 AT 8:32 PM
  • Tiny
  • 96Ford
  • Member

If I was you I would leave the 3.55 gears in because your not gonna gain anymore than a couples mpg's but lose alot of bottom end

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Wednesday, January 16th, 2008 AT 6:03 PM
  • Tiny
  • Indyuke
  • Member

I second that. Your engine will generally turn at a lower rpm. Do a lot more lugging if you go to 3.08's. Keep the 3.55's and the engine will be a lot more efficient by running in it's optimum powerband. You'll have more power to the wheels and get better fuel economy.

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Thursday, January 17th, 2008 AT 8:21 PM

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