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Unread 10-25-2011, 01:28 PM   #1
jhumphrey
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d30 -> 2001 explorer sport TRAC 8.8

hey all,

so my dad found an 8.8 from a 2001 ford explorer sport trac at a local boneyard. he knew that i had been looking for one, so he bought it for me and called me all excited. i wasn't sure if a sport TRAC 8.8 is the same as the explorer 8.8.

I'm at work and did a quick search, but didn't reach a quick conclusion. some of the sites say that the sport trac's rear was 28 spline, others say 31. he told me that it had disc brakes and by all accounts that means it should be a 31 spline, correct? (https://www.fleet.ford.com/truckbbas...01/expstcd.pdf - about half way down it shows axle specs and lists it as 31 spline).

Other than splines, is there a difference between the explorer and the sport trac rear (length, diameter, etc). I just want to make sure this is the right thing, since my dad is several miles from me, id hate for us to get together only to find out this isn't right. it'd be easier for him to get his money back if its not right. oh, gear ratio is 3.73 by all accounts, which i plan to regear to 4.56 anyway.

thanks all!

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Unread 10-25-2011, 01:47 PM   #2
Joe Dillard
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Axle tube diameter is different (~1/4" smaller) according to the link you posted.
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Unread 10-25-2011, 02:00 PM   #3
aztec
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i have a question that pertains to 8.8's.

so i finally have enough money to do the swap and was calling local junkyards and they asked me, 'is it 4x4 or not?' my quesion is: does it even matter?? is there such a thing as a 4WD 8.8 and a 2WD 8.8 other than that guy trying to charge me more money for the same thing?
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Unread 10-25-2011, 02:10 PM   #4
Joe Dillard
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As long as it came from an Explorer (not Sport Trac) the axle itself is basically all the same with the exception of brakes ('91 - '94 = drums, '95 - '01 = discs) and the attached optional sway stuff between models.

So the important stuff (tubes, width, wheel bolt pattern, axle spline count (they are ALL 31 splines if it came from an Explorer) carrier spline count) inside is all the same.

2wd & 4wd doesn't come into play as far as internal strength.
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Unread 10-25-2011, 02:35 PM   #5
aztec
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thank you.
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Unread 10-25-2011, 02:49 PM   #6
jhumphrey
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Quote:
Originally Posted by aztec
i have a question that pertains to 8.8's.

so i finally have enough money to do the swap and was calling local junkyards and they asked me, 'is it 4x4 or not?' my quesion is: does it even matter?? is there such a thing as a 4WD 8.8 and a 2WD 8.8 other than that guy trying to charge me more money for the same thing?
There isn't a difference. Just make sure it's from an explorer and NOT an explorer SPORT TRAC. Apparently (from the best i can gather), they are different in some ways. It is also worth noting that it doesn't matter if the explorer is a 6 cyl or 8 cyl. Heck, even gear ratios don't matter, if you're planning a regear, like me (4.56). Don't pay a premium because it's "4x4".

On that note, I called the boneyard. They confirmed that he bought the 8.8 from a 2001 explorer SPORT, not a sport trac, so I'm golden . I can rest easy now!
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Unread 10-25-2011, 02:57 PM   #7
Joe Dillard
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Nice! Looks like it should workout just fine.
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Unread 10-25-2011, 03:04 PM   #8
aztec
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right on! thanks for the advise and good luck on your build.
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Unread 10-25-2011, 03:27 PM   #9
jeepster93
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The Ford 8.8 came on Crown Vics, Mustangs, E-150 Vans, F-150 pick ups and many things in-between. Ford got good use out of the 8.8 for sure.
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Unread 10-25-2011, 03:38 PM   #10
jbolty
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The good news is that almost all the Explorer Sport seem to have 4:10 gears.

If it's from a sport trak it is almost certainly NOT a 31 spline axle. The sport trak is built off a ranger pickup base and only a very, very small number have the "good" 8.8
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Unread 10-25-2011, 05:00 PM   #11
jhumphrey
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Quote:
Originally Posted by jbolty
The good news is that almost all the Explorer Sport seem to have 4:10 gears.

If it's from a sport trak it is almost certainly NOT a 31 spline axle. The sport trak is built off a ranger pickup base and only a very, very small number have the "good" 8.8
Yeah, I was panicking there for a little bit because I could've sworn he said it was a sport trac. I called the yard and they said it was from an explorer sport, which made me feel MUCH better.

I know that a sport trac made after aug 02 - 05 has the 31 spline 8.8, from what I read. Another article I read said anything before that was 27 spline (ford ranger series). That would've been bad. I'm sure my dad could've taken it back, but that's a lot of hassle...

I still piecing together everything I need for the swap. I'm just excited to have the actual axle . As far as I know, it has 3.73 gears in it, but I plan to put 4.56s in anyway. Overall, my 8.8 project is going to be higher than originally planned, but I did get a great deal on the axle, so that levels it out some...
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