Which Gears

[Sampson]

I'm going to be doing a sas on 37's and am not sure on what gears I should put in my axles. Right now I have the 3.0 5spd but plan on doing an engine swap to a cummins 4bt after the sas is done. I was thinking 5.13 or 4.88 gears. I figured the 5.13 would be better for the 3.0 and 4.88 for the cummins. I don't want to have to change gears twice. Let me know what you think.

Thanks Pat

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[Ford78]

I would go with 5.13. I have 5.13 in mine and a 3.0 . I does pretty good but still wish i had more.

 

[85_Ranger4x4]

If you are really for sure you are going to do the Cummins then do what will make it happy and let the 3.0 suffer through it until you chuck it.

 

[Sampson]

I'm leaning more towards the 4.88's because they would put the rpms lower where the diesel would like it. The 3.0 can suffer.


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[Snoranger]

Do you plan on running an OD trans? If so, whats the gear ratio for OD?
Mostly freeway cruising, mostly slower speed back roads, or mostly off-road?

 

[Sampson]

I do plan on running an OD trans with a ratio of .72. My truck will be a dd/weekend wheeler. So it will see some highway and around town driving.

I've been following your build, I can't wait to see it finished. Its definitely given me a lot of inspiration on mine.

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