Switching from 3.73 to 4.10 - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 11-27-2008
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Switching from 3.73 to 4.10

How would you go about switching to 4.10's from 3.73? Some of the trucks I am looking at have the 3.73 and I want the 4.10 since I plan on getting 33's. Is it a big job/cost/pain?
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Old 11-27-2008
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I was quoted $1,000 + dollars to do mine.

I just bought a FX4 level II axle from a junk yard and paid around 500.00 after everything was bought fluid and hardware
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Old 11-27-2008
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I bought an 8.8 and it cost me $120. But I think the average cost is about $500 for gears and install.
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Old 11-27-2008
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Its cheaper just to find a Ranger axle at a junkyard that already has 4.10s. Then bolt it right in
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Old 11-27-2008
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i bought a 4x4 axle for 400 at the junk yard. and thats all it cost me cuz i put mine in myself.
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  #6  
Old 11-27-2008
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yeah thats what i did
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Old 11-27-2008
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If your 2wd just get a axle. If your 4x4 look for $400-$1000 depending on shop for a gear change front and rear. Yes its a big job, it can take a long time, its a pain if you dont know what your doing.
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Old 11-27-2008
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i have a 2wd and i switched from 3.73 to 4.10 in like 3 hours but i also had 3 other guys helpin out to. it wasnt to bad
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Old 11-27-2008
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I'll be nice and won't say anything to a 3 hour axle job with 3 people in 3 hours.
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Old 11-27-2008
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yeah it wasnt bad at all. umm the only reason why it got done in like 3 hours was because i was at school and i decided to do this as a project and it had to be out of the shop before a certain time. so we had to bust our butts to get it done
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Old 11-27-2008
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I did my axle swap, new rear lift shocks, rear lift, and was out the door in like 20-25 minutes.
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Old 11-27-2008
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Awesome dude, I have been looking for a while now for my 4.10. I actually went to the junkyard yesterday looking for one. I have been there so many time that I have lost track. I probably saw a dozen 3.73 7.5 axles and one 8.8 3.27.
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  #13  
Old 11-27-2008
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Rear axle is a 1-2hr job with the right tools/equipment. The front is a PITA.
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  #14  
Old 11-27-2008
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Do you have to change front and rear axle? and what is 8.8?
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Old 11-27-2008
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8.8 is just another axle that the some of the Rangers came with.
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Old 11-27-2008
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yes if you have a 4wd, and want to use the 4wd you MUST change BOTH axles to matching gear ratios or only be off by a tiny amount like 5.14 and 5.13...
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Old 11-27-2008
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Quote:
Originally Posted by JRanger View Post
i bought a 4x4 axle for 400 at the junk yard. and thats all it cost me cuz i put mine in myself.
I put mine in myself. The fluid is what was the shocker 12.99 for a bottle of fluid.

My buddy and my dad helped. My dad watched mostly as me and my buddy put it in. about 2hrs I think
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Old 11-27-2008
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its like $4-5 at wally world, unless you demand to use the Mobile 1 or Lucas.. then it gets expensive
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Old 11-27-2008
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for the 31 spline Torsen, you must use synthetic fluid, i think thats what he was talking about.

i did both of my axles myself, for $140.

i went from 3.73 to a 8.8 31 spline torsen 4.10 and a front with an aussie locker and 4.10
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  #20  
Old 11-28-2008
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so once i get my 32's all i need to do is swap a 4x4 rear axle to have 4.10's and i'm done?? (mine is 4x2)
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  #21  
Old 11-28-2008
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Quote:
Originally Posted by 99ranger4x4 View Post
its like $4-5 at wally world, unless you demand to use the Mobile 1 or Lucas.. then it gets expensive
The axle I got was the 31 spline torsen so I had to use the synthetic


Quote:
Originally Posted by Baja1000_Edge View Post
so once i get my 32's all i need to do is swap a 4x4 rear axle to have 4.10's and i'm done?? (mine is 4x2)
U dont have to go to a 4wd axle they have 2wd axles with 4.10's in them
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  #22  
Old 11-28-2008
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Quote:
Originally Posted by STL515273 View Post
The axle I got was the 31 spline torsen so I had to use the synthetic



U dont have to go to a 4wd axle they have 2wd axles with 4.10's in them
how can i tell which axle has 4.10? mine does by any chance? lol that would be beautiful

2001 Edge plus 4.0 2WD stepside
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  #23  
Old 11-28-2008
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You can look on the sticker on your door panel and it will give you a code, just look that up here and you'll find out what you have.
Match the number up on this chart

Name:  chart.jpg
Views: 5
Size:  54.2 KB


Or

Little tag on the diff. cover it will say like

4 L 10 88




More info
http://www.therangerstation.com/tech_library/Axles.html

Last edited by Mykhael; 11-28-2008 at 11:14 AM.
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  #24  
Old 11-28-2008
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diff cover
S338W
3 55 88 1024

ok cool thx !!!
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  #25  
Old 11-28-2008
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Quote:
Originally Posted by Baja1000_Edge View Post
diff cover
S338W
3 55 88 1024
Yup you got 3.55 gears same as what I use to have.

Just find a explorer axle with 4.10 then you can have rear disk brakes
they are easy to find

Finding a ranger axle with 4.10 may be more trouble than it is worth unless your lucky like I was. I had 2 different ones to choose from.
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