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Stock differential replacement

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Old Apr 18, 2013 | 01:41 PM
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Stock differential replacement

I have an open 3.08 rear. Want 3.55 and a limited slip. What spline are the factory axles and are these c clip style rears like the mustang? Just wondering what vehicles I can pull a diff out of and make work.
 
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Old Apr 18, 2013 | 01:54 PM
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IIRC, the axles are 30-31 splines (31 I'm pretty sure of)..

And yes they have the C-Clips (8.8's are the same, except spline count, etc..)
 
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Old Apr 18, 2013 | 06:11 PM
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You will need a truck axle those in cars are only 27 spline, but 3.55 gears were extremely common in trucks so you should not have much trouble finding a complete axle to swap in.. which will save you the cost of re-alligning the gearset. If the one you get has unknown miles new axle bearings and seals are a good idea of course, and look for axle code H5 on the drivers door pillar to get the factory limited slip.
 
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Old Apr 18, 2013 | 07:27 PM
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Originally Posted by Conanski
You will need a truck axle those in cars are only 27 spline, but 3.55 gears were extremely common in trucks so you should not have much trouble finding a complete axle to swap in.. which will save you the cost of re-alligning the gearset. If the one you get has unknown miles new axle bearings and seals are a good idea of course, and look for axle code H5 on the drivers door pillar to get the factory limited slip.
Thanks for the tip. Figured it would be easier to find a full rear than it would be to swap out the gears. Do I have to find one off a rwd truck or can I use one off a 4x4?
 
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Old Apr 18, 2013 | 07:29 PM
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v8 ford explorer w/ 8.8 from 97-2000ish. will have the same carrier etc if you're just looking for cheap gears. then you can grab the ratech tool and install them on the driveway. look on the tag before you open them, it will specify posi and gear ratio
 
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Old Apr 18, 2013 | 08:21 PM
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Originally Posted by BlackHD06
v8 ford explorer w/ 8.8 from 97-2000ish. will have the same carrier etc if you're just looking for cheap gears. then you can grab the ratech tool and install them on the driveway. look on the tag before you open them, it will specify posi and gear ratio
That's what I was thinking about doing. Wanted to go to a 3.55 limited slip as cheap as possible.
 
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Old Apr 18, 2013 | 09:18 PM
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Originally Posted by Jarryd
Do I have to find one off a rwd truck or can I use one off a 4x4?
Same rear axle in all F-series of this vintage.
 
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Old Apr 19, 2013 | 01:13 AM
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Originally Posted by Conanski
You will need a truck axle those in cars are only 27 spline, but 3.55 gears were extremely common in trucks so you should not have much trouble finding a complete axle to swap in.. which will save you the cost of re-alligning the gearset. If the one you get has unknown miles new axle bearings and seals are a good idea of course, and look for axle code H5 on the drivers door pillar to get the factory limited slip.
Ummm..

Isn't the codes-

Open Differential | Limited Slip
18=3.08 H8=3.08 LSD
19=3.55 H9=3.55 LSD

?

Because I pulled the 3.55 LSD setup I have to go in my truck, from a 1990 F-150 with a H9 door code.


Just makin' sure here.
 
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Old Apr 19, 2013 | 07:04 AM
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Originally Posted by SideWinder4.9l
Ummm..

Isn't the codes-

Open Differential | Limited Slip
18=3.08 H8=3.08 LSD
19=3.55 H9=3.55 LSD

?

Because I pulled the 3.55 LSD setup I have to go in my truck, from a 1990 F-150 with a H9 door code.


Just makin' sure here.
Isn't there a code on the axle itself?
 
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Old Apr 19, 2013 | 11:23 PM
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Originally Posted by Jarryd
Isn't there a code on the axle itself?
If the tag is still there then yes..

It'll say 3 55 or 3 L55, etc...

And if the carrier is out, etc... The gear its' self has the ratio stamped into it, IIRC
 
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Old Apr 19, 2013 | 11:29 PM
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Are both of those limited slip?
 
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Old Apr 19, 2013 | 11:36 PM
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Originally Posted by Jarryd
Are both of those limited slip?
No...

3 55 is open differential
3 L55 is Limited Slip
 
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Old Apr 19, 2013 | 11:39 PM
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Figured that was the case. I want a limited slip.
 
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