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Old 11-30-2011, 09:50 AM
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4.56/3.73 Gears

I posted this a while back, and I got a little feedback. I just wanted to run it by everyone one more time. I have a '88 Mustang with 4.56 gears installed. I bought a set of 3.73s and a install kit to replace the 4.56 gears currently in it. I'm somewhat mechanically inclined, and I just wanted to ask could this be done in a home garage? I dont drive the car everyday, so it's no rush to get it back together. Basically, I use it as a learning tool. And does anyone know if there's a posting anywhere with a step by step walk-thru on how to do it? I've seen a few, but they're not very detailed.

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Old 11-30-2011, 09:59 AM
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i have been told that this is a good book

thats the best that i can help
i dont know of any web postings
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Old 11-30-2011, 01:11 PM
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Re

Friend of mine just showed up about an hour ago saying he had something for me. It was a rearend, eventhough I've already ordered a gear set. But the id tag reads as follows
S390D 373 A75 8E04
Can anyone tell me what this is out of? He knew I was looking for a set of 3.73 gears. But I'm just curious for my learning curve, is this an 8.8 in. rearend and would it have worked in my 88 Mustang 5.0?
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Old 11-30-2011, 01:15 PM
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Re

Just found my own answer. Out of a Ford Ranger, 7.5. Oh well, maybe I can still cancel my order and use the gears. They are 3.73s.
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Old 11-30-2011, 05:18 PM
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7.5 and 8.8 gears dont interchange.
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Old 11-30-2011, 05:54 PM
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I realized what I said after I posted that. So, I did'nt cancel the order, and now I have 7.5 in. rearend layingin my garage. More junk for my wife to fuss at me about. Who knows, maybe it will be needed one day.
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Old 12-01-2011, 03:29 AM
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This Link is for a GM 8.875" 12-Bolt Diff rebuild, the Ford 8.8" Diff is basically the same style Rear. It's a very detailed Build so it should help you out.
http://www.webrodder.com/article.php?AID=134&SID=60
One more >> http://www.hotrod.com/techarticles/d...install_guide/

Using a Solid Pinion Spacer would make the Install much easier, you don't have to worry about all the torque required for that Crush Sleeve.
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Old 12-01-2011, 08:32 AM
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Quote:
Originally Posted by Mac88
I realized what I said after I posted that. So, I did'nt cancel the order, and now I have 7.5 in. rearend layingin my garage. More junk for my wife to fuss at me about. Who knows, maybe it will be needed one day.
i have another 7.5 we just pulled out of my kids ranger p-up that you can have for your pile
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Old 12-01-2011, 05:04 PM
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Another question just for learning. So if I pulled a 8.8 rearend with 3L73 gears out of an ford explorer, could the entire assembly be swapped into a Mustang 8.8 without messing with the shims or bearings, just a straight swap? Not the entire axle, just the gear assembly and pinion?
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Old 12-01-2011, 10:35 PM
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Very doubtful, you would still need to check Pinion preload, Gear backlash, and Wear/Mesh pattern when swapping Ring & Pinion and Diff. You could start with the stock Shims & go from there.
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Old 12-02-2011, 07:56 AM
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but it would be a cheap way to get a set of gears and a 31 spline carrier
there is a chance it will be close and maybe between the two rears, you can put something together without having to buy too many parts
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Old 12-06-2011, 11:38 PM
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http://www.youtube.com/watch?v=Zgl5xcZmWpI


this might help its on a new f150 but it should be about the same idea?
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