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I just bought a a 1999 F350 SD with the Triton V10 and 5 speed manual transmission. This truck is EXTREMELY low geared. What can I do to get a little more top end?
 

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Change the rear end gearing.

Don't forget that if it is a 4x4 you will also have to change the front end gears also
 
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1999 F250 7.3L & 1986 F250 6.9L Dually
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A lot of the V10 were geared with a 4.10 for pulling power. I would recommend going to a 3.55 or a 3.73. If 4x4 you will have to change the front as well.
 

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There should be a tag under a bolt head on the rear differential cover that will tell you the gear ratio. Likely a 4.10 like PhatNasty said.
 

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I have one of those with the 4.10 and from my research, you are not going to gain enough fuel economy swapping to a 3.73 to make it worth the effort AND you will lose the benefit of the 4.10 for towing.

Most owners say the V10 married to 4.10 is the best combo.

You could increase tire size to 285/75/16 and get a slight benefit. Other than that, improved fuel economy will only come with tune-ups and modifying driving behavior.
 
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