1997 Superduty
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From: Sunny Florida
1997 Superduty
We purchased a 97' F-Superduty for a company truck. The truck is beastly strong, but is super low geared. The truck is turning about 2500 RPM at 60 mph. It is a five speed, but it seems like it could use another gear... is there a six speed we can swap in easily? What other options are there?
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Joined: Oct 2010
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From: Columbus, Oh
We purchased a 97' F-Superduty for a company truck. The truck is beastly strong, but is super low geared. The truck is turning about 2500 RPM at 60 mph. It is a five speed, but it seems like it could use another gear... is there a six speed we can swap in easily? What other options are there?
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From: Sunny Florida
Don't know the gear ratio... it is a company truck. I test drove a few other F-450's recently and none were as low geared as ours. I am at 2100 RPM at 55. Still get about 11 mpg though.
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Joined: Oct 2010
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From: Columbus, Oh
I'm wondering if someone swapped in 4.56's or 5.13's? I'm not sure what the math works out to be for your RPM. What size rim/tires? You could pull the rear cover and count the teeth on the ring gear to know for sure.
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From: Sunny Florida
I am curious if maybe they did a tranny swap in the past?
I could probably pull the cover and count the teeth one weekend. I want to check the gear oil anyway.
I could probably pull the cover and count the teeth one weekend. I want to check the gear oil anyway.
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Cargo Master
Joined: Feb 2009
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From: Yreka, CA
Tranny swap shouldnt really change the final gear much. The zf5/zf6 and e40d are all about the same spot for their top gears.
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Joined: Mar 2006
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From: western SD
If I remember right those are the gears that came standard with the OBS superduty. To the OP, what does the door tag say for rear axel code?
