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Old 03-24-2009, 08:54 PM   #1
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7.5 to 8.8 Tutorial?

I blew up my 7.5 rear end last November before I stored my car for the winter. I snapped the spider gears that got wedged in the pinion and damaged the transfer case. So this has prompted me to get a 8.8 rear end. I need to find a tutorial to do this to help me with the conversion process. If you can link me or help me by explaining any special details here such as changing quad shocks, any drilling, etc., etc. that would be greatly appreciated.

I will be doing the swap with 2 diesel mechanics so I am hoping that this comes fairly easy for us together.

I also still need to order the rear end and Im wondering if I need to order any special parts like different brakes or anything.
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Old 03-24-2009, 08:58 PM   #2
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Re: 7.5 to 8.8 Tutorial?

If you get a diff. out of a GT it should bolt right in
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Old 03-24-2009, 09:15 PM   #3
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Re: 7.5 to 8.8 Tutorial?

'94-'98,8.8, 3.08, quad shock, 5 lug disc brake, w/ABS, �complete rotor to rotor.

Is $300 less than a 99-04 8.8. Is that going to bolt into my 2003 v6 fine as you are saying or does the year change it that much?
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Old 03-24-2009, 09:44 PM   #4
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Re: 7.5 to 8.8 Tutorial?

That rear end will bolt in but it will be narrower.

Also, if you have ABS try to find one with ABS. Otherwise you will have to either swap axles to get the ABS readings or go without.
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Old 03-24-2009, 10:49 PM   #5
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Re: 7.5 to 8.8 Tutorial?

i thought i saw some decently price new rear ends from mustangs unlimited if that helps any
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Old 03-25-2009, 09:05 AM   #6
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Re: 7.5 to 8.8 Tutorial?

you jack up the rear and put the frame on jack stands so the rear hangs down freely

jack up the rear via the chunk (do not put the jack on the back cover, only on the under part so you dont mess up the rear seal)

remove the shocks on each side and brake calipers, use some wire to hang them off to the side so you dont stretch the cables

lower the jack and then move the jack to one or the other axle end and jack it up thus pushing down the other side

remove the spring, reverse and remove the spring on the other side

Place the rear end axle shafts on jack stands if you wish or use the jack to hold it up a big

remove the drive shaft bolts and slide the drive shaft down to the ground

remove the brake lines that go to the axle

remove the lower control arm at the axle on each side

Remove the upper control arm bolts at the axle on each side of the chunk

The rear is now free, reverse following tq specifications

the only issue may be abs wires to fiddle with~ etc
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Old 03-25-2009, 10:07 PM   #7
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Re: 7.5 to 8.8 Tutorial?

Wow have you done this before Specter? Sounds like you know what you are doing. I may take pics and post a tutorial with the step by step process for anyone planning on tackling this job in the future.

How drastic is the narrowness? Does it look bad?
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Old 03-25-2009, 11:22 PM   #8
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Re: 7.5 to 8.8 Tutorial?

Quote:
Originally Posted by Reaperstang View Post
'94-'98,8.8, 3.08, quad shock, 5 lug disc brake, w/ABS, �complete rotor to rotor.

Is $300 less than a 99-04 8.8. Is that going to bolt into my 2003 v6 fine as you are saying or does the year change it that much?
Yea, if you get the '94-'98 rear, you'll need to get spacers. I think the '94'-'98 rear is 0.5" shorter than the '99-'04.
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Old 03-25-2009, 11:56 PM   #9
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Re: 7.5 to 8.8 Tutorial?

I would definitely find a 99-04 8.8 if you are wanting to do the swap.

It's pretty straight forward...just plan a day for it to be safe.
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Old 03-26-2009, 04:56 AM   #10
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Re: 7.5 to 8.8 Tutorial?

As long as you are not having to swap axles, this is a very easy swap and can be done in a couple of hours once you know what you're doing.

The worst part is the driveshaft bolts. They can be a ***** to get loose.
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Old 03-26-2009, 04:13 PM   #11
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Re: 7.5 to 8.8 Tutorial?

Reaperstang posted this at a perfect time, I'm doing a similar swap and have a couple more questions hopefully you guys can help with.

I have a 2007 V6 and just blew the 7.5 rear for the 2nd time. Warranty covered it the first time. I've found places that sell the 8.8s for pretty reasonable price and the only thing that needs to be changed is the pinion flang, so I have that one covered.

My son has a 2003 V6 that he is building the 3.8 into a 4.3. Since I've blew the 7.5 twice I'm sure he will blow it the first time he hits the gas, so want to put an 8.8 into it. From this post it sounds like the 8.8 from 94-04 will bolt right in, with the earlier ones being a little shorter.

Here comes the questions.

I seem to be able to find 05-08 Newer rear ends (takeoffs with < 10 miles) for a lot less $$s than used 99-04. Can a 05-08 8.8 bolt into the 2003? Would the brakes and shocks from the 2003 bolt to the 99-04 rearend? Does the 2003 V6 driveline bolt up the same as the 05-08 V6 or V8 or completely different.

Thanks for any help/advise you can provide.
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