FX4 axle worth it? - Ranger-Forums - The Ultimate Ford Ranger Resource


Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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  #1  
Old 11-07-2011
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FX4 axle worth it?

I've got a base model 2007 Ranger with the 7.5" 4.10 open rear end (axle code 87). Found an FX4 axle with 8.8 4.10 gears for $400, BUT its got 90k miles on it. My truck only has 30k. Should I consider this at this price or move on?
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Old 11-07-2011
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Is it an open dif or ls
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Old 11-07-2011
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Limited slip. I figure I need to either get something like this FX4 axle with the ls already in it or get a lower mileage 8.8 open and put an Aussie locker or something to that effect in it.
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Old 11-07-2011
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That's high.

Go find a 96+ expo 8.8 with disc brakes. All you have to do is flip the spring pads and little brake work.
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Old 11-07-2011
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really depends what u want... ur 7.5 will hold up for daily driving. limited slip will be better in the winter and in wet traction but not completely necessary. if u wanna go offroading than an 8.8 l/s at least is def. preferred.
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Old 11-07-2011
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You've got a point. May not even need an 8.8. It's my daily driver and all I'm really looking for is better traction while pulling into traffic in the rain and the occasional access road. Guess I should research putting something in the current axle as an alternative. Any suggestions?
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Old 11-07-2011
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i have no experience with aftermarket lockers, but an l/s axle could be obtained for pretty cheap at a j/y. like seed mentioned u could go with an expo axle. they have disk brakes from 95+ on I believe and if just a 2wd truck you could lower the truck in the rear by simply bolting up the axle due to them being a spring under axle
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Old 11-07-2011
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I would see if he'd come down in price at all. Any money you throw at that 7.5 might be a waste. What are your plans with this truck? The 4.10s are good for some lift and 31's. However if you wanna lower it and put some 17's w/low profile rubber, then 4.10 years might be too high for you and an axle w/ 3.73 or 3.55 might be a better option.

Make a sig too so we know what equipment/ options your truck has. It makes it easier.
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Old 11-07-2011
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This will be my daily driver. It will see road use 95% of the time and any off road use will be going to the landfill or down dirt access roads. I'm really not too hard on it, just get tired of spinning the inside tire when it's wet. What's weak on the 7.5 axles anyways? Read on a few sites where it was the spider gears, any insight on that? I'll be searching for answers to these questions as well, just thought i would throw it out there.

Everything i'm looking at in the less than 100k miles range is $350 and up. That includes 8.8 ranger and expo rear ends. Is that out of the ordinary? Am i looking in the wrong spots? My main place is car-part.com. Any other good places to scour for this stuff?

I was also looking at this guy, any good?
http://www.summitracing.com/parts/FM...-C75/?rtype=10
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Old 11-07-2011
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What i'm working with, bone stock except for the tires.

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Old 11-08-2011
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I'm not sure what makes the 7.5 a weaker axle. It might have to do with the shaft size and I think I've heard something about the gears also. I do know that people swap them if they wheel alot. If your truck is 2wd and will never see trails that might be a better choice for you.
Bump for a nice truck and hopes for 7.5 info.
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Old 11-08-2011
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The 7.5 28 spline runs the same axles as the 8.8 28 spline, difference is all in the ring gear size. Bigger gear more power handling.

The 31 spline fx4 unit has bigger axle tubes making the housing stronger.

FWIW, mustang guys can run 400hp though the 7.5 but its a little lighter than the ranger. Also the axle wont be used on one wheel like when you off road.

IMHO, being South Carlina running on the street I don't see the need for an L/S as long as this is a DD.
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Old 11-08-2011
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The FX4 Torsen limited slip is very desirable. $400 isn't too bad actually considering it has disc brakes, 31 spline axles, bigger bearings ect ect.

I'd pick that up in a heart beat. Save yourself some work from welding new perches and shock mounts on an expo axle.

It is basically the same thing as an exploder axle, with the spring perches flipped, and new shock mounts welded on.

Scoop that sucker up and you'll be money ahead.

**** I have over $1000 into a JY expo axle and I did half the work myself.
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Old 11-09-2011
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Also the FX4 axle is the correct width as the expo is narrower. For a street queen with no power adder I see it as a waste of money.
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Old 11-09-2011
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I am also going to say that $400 for a Torsen LSD and 8.8 that will directly bolt in is a good deal, if you are concerned about the mileage, inspect the gears before you buy.

I also thought about getting an EXPO rear end but the extra work to end up with a narrower rear is just not worth it...
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Old 11-09-2011
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Quote:
Originally Posted by Blhde View Post
Also the FX4 axle is the correct width as the expo is narrower. For a street queen with no power adder I see it as a waste of money.
Quote:
Originally Posted by angus- View Post
I am also going to say that $400 for a Torsen LSD and 8.8 that will directly bolt in is a good deal, if you are concerned about the mileage, inspect the gears before you buy.

I also thought about getting an EXPO rear end but the extra work to end up with a narrower rear is just not worth it...
False. Explorer axles are the same width. Actually they are a hair wider but
For all intensive purposes the are the same as the Ranger's WMS to WMS.

Where do you guys get all your mis-information?
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Old 11-09-2011
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Wrong. No disk brakes
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Old 11-09-2011
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Quote:
Originally Posted by j99ranger4x4 View Post
Wrong. No disk brakes
Whoops. My bad.

But it does have the bigger drum brakes versus the 7.5. And it would be a bolt on affair to put expo disc brakes on the fx4 axle I believe ( though I could be wrong, but I doubt it).
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  #19  
Old 11-15-2011
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Guy started getting all wishy washy on me with the price so I moved on. Decided that the toughest duty it will get might be a donut in a field or a muddy road so decided to stick with the 7.5" rear end for now and slap the ford racing lsd in there. Install went well and am happy with the results. Won't be spinning wheels in the air with this truck so no too worried about strength. We'll see if I have to eat those words down the road, but so far i'm happy with my decision.

Currently getting the parts together for an OEM power window swap. That's for another thread though. :-)
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