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Discussion Starter #1
Ok so i am a fairly new 7.3 owner, and i drive alot of highway miles. I used to drive at 75mph but since i got my F-250 i only drive at about 69mph cuz of how high the rpms are at 75. I know these engines are beasts, so i was wondering if it will hurt the engine in any way if i set my cruise at 75mph? :confused:
 

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Discussion Starter #5
I am pretty sure that it has 3:73, but i am not positive, is there anywhere on the truck that it specifies. at 69mph my rpms are at about 2100-2200
 

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Sounds like 3:73's
 

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Discussion Starter #7
Ok good, cuz i was just a little worried that cruising with the rpms up that high might damage the engine, but it sounds like it will be fine.
 

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Nope wont hurt anything... ive put mine on cruise around 80 before. but usually keep mine around 70 for fuel mileage...
 

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Canadian Stroker
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They relay smooooooth out over 80:ford:
 

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There is a tag on the diff attached by one of the bolts. A lot of #'s look for 3.73 or 3L73 which is limited slip.
 

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We put the FU! in FUN
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mpg would be the only thing i would be worried about.. Thats why i cruise @ 62-65mph
 

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Discussion Starter #15
Yay mine says 3L73! woohoo! :ford: What about posi? did any of these come with it? :confused:
 

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Yay mine says 3L73! woohoo! :ford: What about posi? did any of these come with it? :confused:
Most poeple refer to a limited slip as a posi. Actually a limited slip other than a detroit trutrac has clutches in it that transfers traction to the side thats spinning. A tru posi is a locker. Both sides are locked together.

What you have is a fact limited slip. Which is good. If it ever needs replaced put a trutrac in it.
 

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you can tell your gear ratio by jacking the back end up and rotating the tire and every turn of the tire the drive line will turn about 3 3/4s turns and so on.so the ratio is 3.73 to 1.
 

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Discussion Starter #18
Ahhh i see, thanks for the clarification ;), well it seems to be pretty much always locked so i figured it was a posi/limited slip. Works good in mud! :evil
 

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I run my van at 80mph all the time, fuel economy is def down compared to 65mph but I get bored driving 60miles one way to work and can't keep the speed down, btw it's got 3:55's with 245/85/16's on it.
 
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