Axle Swaps???
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Freshman User
Joined: Jan 2004
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From: Richlands N.C.
Axle Swaps???
My 97' F150 4X4 has 3.55 gears and I would like to upgrade to 3.73's. Will axles from a newer truck bolt up? What if they're 9.25" vs. 8.8"? I have read that lower gearing really helps the 4.6 on the low end with out killing gas mileage, assuming you don't go too low. I'm not looking to get any radical improvements, just want to make the usual tasks (occasional load of lumber, pulling a camper 8 or 10 times a year) a little easier on the engine. What do you guys think?
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Freshman User
Joined: Jan 2004
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From: Richlands N.C.
I'm running 265-70 16's. I found several stock 3.73 gear sets on ebay. But I've always heard that swapping gears required some special tools for setting backlash and other stuff, and that even with the right tools it was still pretty tricky. I'm pretty handy with anything mechanical, I've rebuilt engines in cars, atv's, etc. But I have absolutely no experience with diff's. Thats why I was looking at swapping out the whole thing.
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Freshman User
Joined: Jan 2004
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From: Richlands N.C.
Yes, I had already figured on doing both diff's. If I just swap out the gears in them would I need more than just the ring and pinion sets. Will the clutch in my rear diff work with 3.73 gears?
Mountain Pass
Joined: Oct 2005
Posts: 224
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From: High River
If you decide to do it I would like to know if you want your old gears I am running 3.08 and would like to put 3.55 in I also have a 4x4. any help would be appreciated.
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i have naver done it...
find someone who will back you up and get them installed and make her it comes with a warrenty...
doing it your self can be done but i dont know how so i cant say lol
need the tools.. you need some weard tool to sence how much space thare is on the
gears or something and you need a press for Sureeee...
i have seen it started naver finshed...
find someone who will back you up and get them installed and make her it comes with a warrenty...
doing it your self can be done but i dont know how so i cant say lol
need the tools.. you need some weard tool to sence how much space thare is on the
gears or something and you need a press for Sureeee...
i have seen it started naver finshed...
Posting Guru
Joined: May 2006
Posts: 2,486
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From: Iowa
Its really not to bad of job once you have done it a couple of times. Except for the back lash... that is kinda tricky. Your best bet is to let sombody who knows what there doing to help you with it. Im sure that you can figure it out but alot of times when sombody who is new to it does it, you will have a humming noise especially when decelerating.
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