Fox T-Bird/Cougar Forums

Technical => Drivetrain Tech => Topic started by: dragon574444 on March 24, 2010, 12:09:19 PM

Title: 3.45 Axle Ratio. Wait, what?
Post by: dragon574444 on March 24, 2010, 12:09:19 PM
I was looking at my history 999 report today when I noticed something that didn't make sense...yet I'm hoping is true :D
According to Cool Cats, these cars should have come with a 2.73 gear?
(http://i98.photobucket.com/albums/l280/dragon574444/1984%20Ford%20Thunderbird/LetterfromFordedit.jpg) (http://s98.photobucket.com/albums/l280/dragon574444/1984%20Ford%20Thunderbird/?action=view¤t=LetterfromFordedit.jpg)
Title: 3.45 Axle Ratio. Wait, what?
Post by: vinnietbird on March 24, 2010, 01:57:18 PM
What rear does it have now? I just called for the Sport's report.They said they'd call me within two business days,then I can have them mail or email the report.We'll see what happens.
Title: 3.45 Axle Ratio. Wait, what?
Post by: jandmmustangs on March 24, 2010, 05:33:28 PM
The 86 Cougar XR7 Turbo i just parted out had a 3.45 tracloc rear in it.  It was a 7.5in though.
Title: 3.45 Axle Ratio. Wait, what?
Post by: Cad-T-Bird 500 on March 24, 2010, 05:54:42 PM
Yes but I thought all the V-8 models were 2.73.  You need to crawl under the car and look for yourself.

TED
Title: 3.45 Axle Ratio. Wait, what?
Post by: ZondaC12 on March 24, 2010, 07:32:23 PM
Yea I believe standard for a 5.0 was 2.73s....and then 3.08s were optional. Or *maybe* 3.27s, if I remember correctly from coolcats, 87 and 88 the 5.0 XR7s could have a 3.27 trac-lok if ordered that way.
Title: 3.45 Axle Ratio. Wait, what?
Post by: mcb82gt on March 24, 2010, 07:43:56 PM
3.45's were only for the Turbo 4 cars

One way for sure to tell is, jack the rear end up and turn the tire 1 revolution and count how many times the driveshaft makes complete rotations.  About 3.5 times would be your answer.
Title: 3.45 Axle Ratio. Wait, what?
Post by: hypostang on March 24, 2010, 07:50:57 PM
Quote from: mcb82gt;315708
3.45's were only for the Turbo 4 cars

 



^^^^^^^^^^^^^^^^
and certain 5.0 84 elans :rollin:
Title: 3.45 Axle Ratio. Wait, what?
Post by: V8Demon on March 24, 2010, 08:09:14 PM
Dealer option?????
Title: 3.45 Axle Ratio. Wait, what?
Post by: mcb82gt on March 24, 2010, 08:10:29 PM
Quote from: hypostang;315710
^^^^^^^^^^^^^^^^
and certain 5.0 84 elans :


How odd would that be if that were true!  How could Ford screw that up on a report??
Title: 3.45 Axle Ratio. Wait, what?
Post by: dragon574444 on March 24, 2010, 09:56:02 PM
Well, the sticker on my door jamb says I have a locking 3.08 axle. I think I'll do what mcb said, just for the hell of it. It is a 7.5" by looking at the shape.
Title: 3.45 Axle Ratio. Wait, what?
Post by: hypostang on March 24, 2010, 10:01:40 PM
Quote from: mcb82gt;315712
How odd would that be if that were true!  How could Ford screw that up on a report??


Stranger things have happened  , I  owned a vintage Mustang once with two different VIN stampings  one above the other on the inner fender .
Title: 3.45 Axle Ratio. Wait, what?
Post by: jandmmustangs on March 25, 2010, 07:30:31 AM
That was a pretty common occurance.  Those vins were hand stamped on the assembly line.  It seemed to happen at the Dearborn facility more than anywhere else.
Title: 3.45 Axle Ratio. Wait, what?
Post by: TurboCoupe50 on March 26, 2010, 10:32:08 PM
Quote from: V8Demon;315711
Dealer option?????


Unless it was a mandated factory modification, the 999 report would not show any dealer changes(doubtful even then)...

Just goes to show, don't believe everything you see...
Title: 3.45 Axle Ratio. Wait, what?
Post by: V8Demon on March 26, 2010, 10:37:24 PM
Quote from: TurboCoupe50;316034
Unless it was a mandated factory modification, the 999 report would not show any dealer changes(doubtful even then)...

Just goes to show, don't believe everything you see...


That's what I meant.  Maybe the dealership actually did a special order for one for some reason?  I would guess stranger things happened....
Title: 3.45 Axle Ratio. Wait, what?
Post by: TurboCoupe50 on March 26, 2010, 11:54:58 PM
AFAIK the 3:45 wasn't available for order on a 5.0 for any reason, I believe the combo would have had to be smog certified...

Anyway the data tag calls out a 3.08, just another Ford screw up...


One of my cousins worked at the Norfolk Assembly(now closed), on a tour for myself and a friend in '94 he said his son wanted a certain axle ratio in his truck but wasn't available, I said "Lee you can't fix that"??? He said "nope parts are ID and loaded on the assembly line by Job/VIN number, and besides the supporting plants only ship parts in after the vehicles order number was received in the front office... A axle assly would have to be mis-marked at the plant that mfg'd it to be incorrectly installed...
Title: 3.45 Axle Ratio. Wait, what?
Post by: V8Demon on March 27, 2010, 09:38:08 AM
Would it have been the same 10 years earlier though?


Probably.



Is it worth it to point out this discrepancy to the people who do the 999 report?
Title: 3.45 Axle Ratio. Wait, what?
Post by: EricCoolCats on March 27, 2010, 09:38:30 AM
Refer to the information here please...

http://www.foxtbirdcougarforums.com/showpost.php?p=250839&postcount=7

Should help you figure it out.

History 999 reports are known to be wrong sometimes. I've seen incorrect axle ratios before on them.