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Old 08-23-2005, 05:19 PM   #1
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ThunderBird IRS ...Rear End Swap to 8.8

I need to know if its possible to swap the Independent Rear Suspension found on the 1993 Thunderbird for a Solid 8.8 out of say a 5.0 Mustang. Does anyone know where I could ask (forums or tech articles) or maybe have done it themselves (or know someone that has done it) where I may get some information. Thanks for any help
-jesse
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Old 08-23-2005, 07:20 PM   #2
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Old 08-24-2005, 11:43 AM   #3
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your only option is to back-halve the car.
Whats wrong with the IRS?
There are a few guys that have thier "IRS" t-birds and cats in the mid to high 10's.
Of course with aftermarket axles and poly bushings, and other crap I can't remember.
The IRS is strong, it will hold a lot of power, in stock form, as long as you don't do a lot of high RPM drop clutches(but yours is most likely an auto, unless you've swaped it out for a 5 speed of some kind).
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Old 08-24-2005, 02:43 PM   #4
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I thought the IRS and solid axle 8.8 were direct swaps?!?!?!?! utilizing the same mounting locations and all..
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Old 08-24-2005, 03:23 PM   #5
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mustangs only direct swap. the mn-12's got their own irs for them and only them and i think the mark 8. it's not a fox platform and the cars are wider than a mustang. i would look for a mark 7 rear with the longer axles. if you want to swap out. and. pluse they usually have like 3.08-3-27's bc they are heavy
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Old 08-24-2005, 03:29 PM   #6
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Quote:
Originally Posted by 88CougarCoupe
mustangs only direct swap. the mn-12's got their own irs for them and only them and i think the mark 8. it's not a fox platform and the cars are wider than a mustang. i would look for a mark 7 rear with the longer axles. if you want to swap out. and. pluse they usually have like 3.08-3-27's bc they are heavy
Yup. The MN-12 is an entirely different chassis from the fox/SN95. It's definitely not a direct swap
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Old 08-24-2005, 03:31 PM   #7
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I thought most Mark VII's were 3.73's?
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Old 08-24-2005, 10:05 PM   #8
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The T-bird, Cougar, and Mark VIII,(from 89-97) all share the same platform - MN12, I also belive that the 97-98 Lincolns were on an FN10 platform(I think).
Which all had an IRS from the factory, it didn't matter if it had a V6, V8 or SC V6.
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Old 08-24-2005, 11:11 PM   #9
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Quote:
Originally Posted by MYLITTLEHO
I thought most Mark VII's were 3.73's?
Mark 7's were 3.27's or 3.55's.

Mark 8's (which is what the IRS we are discussing here) comes with 3.08's except for the LSC's which get 3.27's.

And yes, the Mark 8 is an FN-10 chassis...which is a full sized version of the MN12.

The Cobra IRS is borrowed from the MN-12 chassis but will not interchange. It's similar though as a popular mod with the Mark 8's is to swap Cobra halfshafts on and SN95 hubs and convert to Cobra disk brakes and the SN95 lug pattern.
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