Mechanics

REAR END GEAR CHANGE

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
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Specktruck
January 2, 2007.



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

Blackop555
Jan 5, 2008.
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

Tiny
96Ford
Jan 16, 2008.
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.

Tiny
Indyuke
Jan 17, 2008.