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post #1 of 5 (permalink) Old 09-16-2009, 06:23 PM Thread Starter
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Mark VIII IRS

Will a 95 Mark VIII IRS fit work on a 97 tbird? Assuming we are replacing the bags with springs. Shouldn't be an exact swap?
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post #2 of 5 (permalink) Old 09-16-2009, 07:13 PM
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Yes, but you have to get some spring perches if you don't use the airbags.
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post #3 of 5 (permalink) Old 09-17-2009, 06:24 AM
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Yes, but be advised that ALL Mark VIII's have open differentials.

IMHO, there really isn't enough difference between the two to really justify a swap. To my knowledge the only major differences are the lower control arms are lighter on the Mark VIII and the Mark VIII's differential housing is lighter, but doesn't come with posi.

But I guess it depends on the intended application, and just my .02.

97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!! )
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
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post #4 of 5 (permalink) Old 09-17-2009, 09:47 AM
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Quote:
Originally Posted by 94 Daily Driven 4.6L View Post
Yes, but be advised that ALL Mark VIII's have open differentials.

IMHO, there really isn't enough difference between the two to really justify a swap. To my knowledge the only major differences are the lower control arms are lighter on the Mark VIII and the Mark VIII's differential housing is lighter, but doesn't come with posi.

But I guess it depends on the intended application, and just my .02.
Interesting, I never knew that first tidbit.
If you want the advantage of lighter parts it will be much easier to just swap the control arms and the pumpkin. (After you install Trac-Lok and steeper gears, of course!)
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post #5 of 5 (permalink) Old 09-17-2009, 10:16 AM
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Yeah, the only gear ratios available were 3.07 open or 3.27 open....

97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!! )
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
73 Mercury Cougar Convertible w/351C 4V (Partially Restored)
69 F100 LWB w/460 Engine
76 Glastron Carlson 23' Jet Boat w/460 CJ Engine
94 Daily Driven 4.6L is offline  
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