gear ratio swap
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New User
Joined: Dec 2006
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From: so tex
gear ratio swap
i have a 97' ford f-150, with a 5.4, automatic. the truck has a 7" lift and runs 35's. i have been wanting to change the gears for a while, however, if i change the rear to 5.13, will i need to make any adjustments for the front end? i always thought the front and rear gearing had to match. i know with my ifs there is no front dif, but surely there is something that regulates the gearing right? any one know anything or every done something like this?
Mountain Pass
Joined: Dec 2006
Posts: 114
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From: Hudson Valley, NY
If it is a 4x4 you have a front diff...It sounds like you are thinking of a solid front axle, one that looks like your rear end but allows the front wheels to turn.
I think the F-150 IFS has the diff. on the left arm????
513 gears...!!!...I don't know if your rears can accept them...some housings are made for a certain ratio down and then others for ratio's up...you need to do alot of homework first...good luck
I think the F-150 IFS has the diff. on the left arm????
513 gears...!!!...I don't know if your rears can accept them...some housings are made for a certain ratio down and then others for ratio's up...you need to do alot of homework first...good luck
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New User
Joined: Dec 2006
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From: so tex
thanks for the input guys, i never thought about the truck not taking that size gears. i'm moving up to 37's and when i looked at the chart at four wheel parts it recommended 5:13's. i thought it was a bit over kill anyways. i guess i'll check what size can be put in there. i pull my travel trailer quite a bit and was looking for a little more power. thanks again!!
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New User
Joined: Dec 2006
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From: so tex
it's a four wheel drive. i don't know for sure what axle is in it, but it has the 5.4 so it should have the bigger one. we swapped my friend's rear end out on his and i remember his was smaller because he had the 4.6.
