99 GT IRS?

stang1996gt · 08-06-2001, 08:08 AM

Does the 1999 GT have the IRS or does it have the regular Ford 8.8? my friend wants to put 3.73s on his 99 gt 5-speed, this will be his first mod (besides K&N) along with something else...help decide for him! thanks

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1996 GT full exhaust and underdrive pullys: 14.6 @93 MPH

95mustanggt · 08-06-2001, 09:27 AM

No. So far only the 99+ Cobras have IRS.

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1995 Mustang GT

32V SVT · 08-07-2001, 11:48 AM

I'm told the "Upgrade" to an IRS package is about a $4k investment into the car, and don't know if they can retro-fit the IRS to the pre 1999 chassis...

Rara · 08-08-2001, 09:57 AM

the IRS should fit, even as far back as a 79 mustang, though pre sn95 cars may need a bit more modification. But I personally wouldn't recommend it, especially if your looking to go faster, even around corners.

Nitrous Al · 08-11-2001, 09:33 PM

The 1999 GT has a regular 8.8" rearend. The 1999 Cobra has the IRS rearend. The 3.73:1 gearset should knock a half of a second off the e.t. and really spin the tires with the transmission's 2.90:1 first gear.

08-06-2001, 08:08 AM	#1
stang1996gt Registered Member Join Date: Jun 2001 Location: LaFox, IL USA Posts: 23	99 GT IRS? Does the 1999 GT have the IRS or does it have the regular Ford 8.8? my friend wants to put 3.73s on his 99 gt 5-speed, this will be his first mod (besides K&N) along with something else...help decide for him! thanks ------------------ 1996 GT full exhaust and underdrive pullys: 14.6 @93 MPH

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08-06-2001, 09:27 AM	#2
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	No. So far only the 99+ Cobras have IRS. ------------------ 1995 Mustang GT

08-07-2001, 11:48 AM	#3
32V SVT Registered Member Join Date: Aug 2001 Location: Redondo Beach, Ca. Posts: 8	I'm told the "Upgrade" to an IRS package is about a $4k investment into the car, and don't know if they can retro-fit the IRS to the pre 1999 chassis...

08-08-2001, 09:57 AM	#4
Rara Registered Member Join Date: Aug 2001 Location: Novi, MI Posts: 1	the IRS should fit, even as far back as a 79 mustang, though pre sn95 cars may need a bit more modification. But I personally wouldn't recommend it, especially if your looking to go faster, even around corners.

08-11-2001, 09:33 PM	#5
Nitrous Al Registered Member Join Date: May 2000 Location: Everett, MA Posts: 417	The 1999 GT has a regular 8.8" rearend. The 1999 Cobra has the IRS rearend. The 3.73:1 gearset should knock a half of a second off the e.t. and really spin the tires with the transmission's 2.90:1 first gear.