8.8" diff in an Aerostar?
Thread Starter
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Laughing Gas
Joined: Sep 2004
Posts: 1,057
Likes: 3
From: gravel road ONTARIO
8.8" diff in an Aerostar?
I have heard rumoured that some Aerostars came with an 8.8" rearend. Is this true or just somebody wishfull thinking? I am picking up my "PARTS" Aerostar on Tuesday afternoon and it is a 1995 Aerostar sport extended, with a 4.0 , and I was wondering about an 8.8 in it. It is not AWD.
Thanks for any input!
Thanks for any input!
Senior User
Joined: Feb 2004
Posts: 389
Likes: 0
From: Rochester, NY
IIRC, a number of them had 8.8" axles, but I think it may have been the last few years of production and only with a 4.0L. Only 2WD as well, at least that's what everyone had always said...
That said, check the axle code. The codes have been posted here a number times, so you should be able to find it in a search.
That said, check the axle code. The codes have been posted here a number times, so you should be able to find it in a search.
Thread Starter
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Laughing Gas
Joined: Sep 2004
Posts: 1,057
Likes: 3
From: gravel road ONTARIO
Thanks for the replies. It has an axle code of '25' on the sticker. It does look bigger than the one in the 93 3.0 and I could read some of the code on the axle tag. On the one line I think it said ??? 8.8 4L16 . could it have a 4:16 ratio ?
I don't get home from work until around 2 am thats why I post at weird hours.
I don't get home from work until around 2 am thats why I post at weird hours.
Senior User
Joined: Feb 2004
Posts: 389
Likes: 0
From: Rochester, NY
There's no such thing as a 4:16:1 gear set for an 8.8... From another thread:
Code Ratio
Conventional
22 4.10
23 3.45
24 3.73
25 3.27
26 3.55
Traction-Lok
B2 4.10
B4 3.73
B9 3.55
Code Ratio
Conventional
22 4.10
23 3.45
24 3.73
25 3.27
26 3.55
Traction-Lok
B2 4.10
B4 3.73
B9 3.55
Last edited by Torsen Rick; May 16, 2006 at 01:39 PM.
Lead Driver
Joined: Sep 2003
Posts: 7,015
Likes: 208
From: SoCal
As I posted a couple days ago, I saw with my own two eyes an 8.8" (open diff) rear axle on a 1991 2wd Aerostar. I don't believe that they were "leftovers" from anything. They have that rear upper control arm pivot cast right into the housing, so they can't come from any other car line. And 1991 was well before the end.
By the way, we found out that a 2wd with open diff is like a 1wd when trying to drive in slippery conditions.
By the way, we found out that a 2wd with open diff is like a 1wd when trying to drive in slippery conditions.
Post Fiend
Joined: Oct 2005
Posts: 5,242
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From: Kiev, Ukraine
I have 8.8'' rear end (trully I have 2 rear end, but I swap it every year. 3.45 is used for summer, 4.1 - for winter). Unfortunatly flanges are different, 3.45 is whith 2 u-bolts...
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Junior User
Joined: Jan 2004
Posts: 62
Likes: 0
I believe that when Ford added the rear anti lock brakes in the '90 model they went to the 8.8. My '90 3.0L auto does have an 8.8 and it came from the factory that way.
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Lead Driver
Joined: Sep 2003
Posts: 7,015
Likes: 208
From: SoCal
RABS came on the Aerostar before 1990. I know someone with an 89 model that has it. I'm not sure of the size of the rear diff though.
My 1990 4wd has a 7.5 rear diff. Maybe they figured that with AWD, at least 30% of the power goes to the front drive train, so the rear does not have to be as strong as a RWD where the rear end has to take all the power of the engine. Just guessing.
My 1990 4wd has a 7.5 rear diff. Maybe they figured that with AWD, at least 30% of the power goes to the front drive train, so the rear does not have to be as strong as a RWD where the rear end has to take all the power of the engine. Just guessing.