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Discussing 99 Cobra IRS rear end or beef up 7.5 stock? in the V6 Mustangs Forum. I have a chance to pick up a 99 cobra IRS rear end with 3.27 ... Modded Mustangs is the premier Ford Mustang Forum on the internet. We discuss all aspects of the Ford Mustang on the forum. Registered Users do not see the above ads. Please Register - It's Free! |
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#1 |
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Newbie
2000 V6 Mustang
Join Date: Mar 2009
Location: In da middle of da sea
Posts: 44
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99 Cobra IRS rear end or beef up 7.5 stock?
I have a chance to pick up a 99 cobra IRS rear end with 3.27 gearing with a little of 70K miles on it for $400.00.
I would like to change to 3.73 and detroit T-loc (or is a loc in there already?)..is it worth it? Or should I just get a t-loc and gearing for my 7.5? Is that a good deal? I don't plan on getting bigtime horsepower, so I think I can get away with beefing up the 7.5, but is this a good price and oppurtunity to do that swap? what do you guys think?
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2000 V6 Atlantic Blue GT Clone True Duals Flowmaster 40's originals custom "H" pipe Headers Eibach Drop Custom tuned w/SCT X3 and a lot more..... Saving for my NEW EDGE GT |
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#2 |
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Hardcore Enthusiast
2003 V6 Mustang
Too long@Too slow
Join Date: Oct 2008
Location: NC
Posts: 2,005
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well, you dont even need an 8.8 in rear end until you go forced induction, but a t-lok and gears will run over $400 after you get it installed, and you should be able to install the 9" rear end on your own. the 9" will have a t-lok, and a detroit tru trac isnt very streetable, so a t-lok is advised if youre not going to make too much power.
its a very good price, but youll just be having extra weight that could be avoided. but the final decision is up to you
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#3 |
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Sonic Blue FTGDMFW!!!
2004 Mustang v6
Join Date: Apr 2007
Location: Portland, TN
Posts: 3,863
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if i can recall from talking to cobra guys around here...they prefer a GT rear end if they wanted to get a 8.8 over the cobra rear set-up...something about the difference between drag vs track racing....i don't know for sure, but i thought this might spark an idea and give ur thread a bumb
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2004 Mustang 3.9 v6 K&N - Flowmaster Original 40s Catback - 5k HIDs Headlights - 6k HID Fog Lights - Alot of blacked out stuff - Show car shine 24/7 Fuckers
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#4 |
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v6 Mustang GOD
2k2 Mustang V6
Join Date: Feb 2007
Location: TEXAS
Posts: 7,128
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Yep, cobra rear end is better for people who are going to auto-x and road course. And it will require you to change your exhaust also.
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#5 |
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Hardcore Enthusiast
2003 V6 Mustang
Too long@Too slow
Join Date: Oct 2008
Location: NC
Posts: 2,005
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ya ive heard that too, something like the 9" irs doesnt launch as well as the 8.8" solid live axle.
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#6 |
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Hardcore Enthusiast
2003 V6 Mustang
Too long@Too slow
Join Date: Oct 2008
Location: NC
Posts: 2,005
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i didnt even think about that, that will run you a couple hundred more, which basically makes the 9" irs not worth it at all on a low power v6.
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#7 |
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v6 Mustang GOD
2k2 Mustang V6
Join Date: Feb 2007
Location: TEXAS
Posts: 7,128
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9" ?
I thought we were talking about an IRS.
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#8 |
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Newbie
2000 V6 Mustang
Join Date: Mar 2009
Location: In da middle of da sea
Posts: 44
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Yeah..
I never really heard much about IRS rear's. Only swapping out for GT rear ends, so I have no idea what is expected. He was also going to include the catback for the axle, so I guess the exhaust my existing exhaust might have to be modified. Ah...I think I might just stick with my 7.5 and gear it to 3.73 and t-loc her. BTW..is the IRS 9" rear end???...DAYUM!!!
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2000 V6 Atlantic Blue GT Clone True Duals Flowmaster 40's originals custom "H" pipe Headers Eibach Drop Custom tuned w/SCT X3 and a lot more..... Saving for my NEW EDGE GT |
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#9 |
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v6 Mustang GOD
2k2 Mustang V6
Join Date: Feb 2007
Location: TEXAS
Posts: 7,128
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Irs = 8.8
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#10 |
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Hardcore Enthusiast
Modded V6
Join Date: Sep 2006
Location: Mukilteo WA
Posts: 1,259
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How much power do you plan on making?
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2001 SVT Cobra- SLP o/r x-pipe, Comp Cams, Borla exhaust, BBK CAI |
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#11 | |
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Air Embolism Assassin
2004 Cobra #2260/3768
Join Date: Sep 2005
Location: Chesapeake
Posts: 7,101
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The IRS is better for handling. So if you want it to be a car that handles better than your average mustang you can go the irs way, but if you plan on drag racing it keep a solid axle. The IRS is known for wheel hop in Cobras especially the 03-04 which can all sorts of problems. Now granted if your not looking for tons of power you probably won't be thinking of the power range of the 03-04 Cobras. Not saying they have a lot, but just saying that might be out of the range your looking at. |
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#12 |
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Hardcore Enthusiast
2000 V6
Join Date: Jan 2007
Location: Albuquerque
Posts: 2,587
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Dont go irs...and if you dont plan on a lotta power keep the stock rear
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2000 V6 vert Mac LT headers, Mac O/R H-pipe, Mac CAI, ASP 25% underdrive pulley(r.i.p), SCT tune, 8.8 rear and 4.10 gears. |
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#13 |
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Regular
1999 Mustang GT
10.6@130
Join Date: Jan 2009
Location: Texas
Posts: 467
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IRS > 8.8 solid > 7.5 solid
IRS hooks better on the street IRS hooks better on the track (when setup properly) IRS ride quality is TONs better. I know. I traded my solid for an IRS. I made over 650-700rwhp and its still together. Stock axles, stock Posi, IRS brace at a minimum, and poly bushing if you can. FOr your application, you can probably just to IRS brace and springs. It will hold a lot and keep the axle hop down. |
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#14 |
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Newbie
2000 V6 Mustang
Join Date: Mar 2009
Location: In da middle of da sea
Posts: 44
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I don't plan on going any higher with the horsepower then what my stock engine with headers and CAI can push out.
I guess makes more sense to keep my 7.5. So I think I might just T-loc and 3.73 the rear end.
__________________
2000 V6 Atlantic Blue GT Clone True Duals Flowmaster 40's originals custom "H" pipe Headers Eibach Drop Custom tuned w/SCT X3 and a lot more..... Saving for my NEW EDGE GT |
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#15 |
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Hardcore Enthusiast
2003 V6 Mustang
Too long@Too slow
Join Date: Oct 2008
Location: NC
Posts: 2,005
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wow, its is 8.8, i wonder where i got 9 from
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#16 | |
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Sonic Blue FTGDMFW!!!
2004 Mustang v6
Join Date: Apr 2007
Location: Portland, TN
Posts: 3,863
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__________________
2004 Mustang 3.9 v6 K&N - Flowmaster Original 40s Catback - 5k HIDs Headlights - 6k HID Fog Lights - Alot of blacked out stuff - Show car shine 24/7 Fuckers
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#17 |
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Regular
1999 Mustang GT
10.6@130
Join Date: Jan 2009
Location: Texas
Posts: 467
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91 LX. upper/lower control arms, 3.73s, built Windsor, 5500rpm launch, solid, NO A/C, No backseat, lightened.
1.69 60ft on 16" ET streets. 99 GT, Full weight +IRS, A/C, back seat, 3.55 gears, no transbrake, leaving at 2300-2400, no boost till almost the 60ft mark...heavy... 1.73 60 on the same ET street from 3 years ago. Ill take the IRS any day. AND I know some 1.5 60 ft IRS cars...stock save for a brace. |
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