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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> 4.56/3.73 Gears
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Topic Review (Newest First)
12-06-2011 11:38 PM

this might help its on a new f150 but it should be about the same idea?
12-02-2011 07:56 AM
matts37chev 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
12-01-2011 10:35 PM
SSedan64 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.
12-01-2011 05:04 PM
Mac88 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?
12-01-2011 08:32 AM
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
12-01-2011 03:29 AM
SSedan64 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.
One more >>

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.
11-30-2011 05:54 PM

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.
11-30-2011 05:18 PM
lmsport 7.5 and 8.8 gears dont interchange.
11-30-2011 01:15 PM

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.
11-30-2011 01:11 PM

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?
11-30-2011 09:59 AM
matts37chev i have been told that this is a good book

thats the best that i can help
i dont know of any web postings
11-30-2011 09:50 AM
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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