While being in school learning everything fom metal work to enigine, i want to start putting together my build plan for my iroc! starting with rear end, want posi, what do i get? would like to include rear disk at same time
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Post Whore
- November 8th, 2009
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- Tyler Porter
- 85 Z28, 91 Trans am
- Clinton Township Michigan
- student
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ls rears a decent lower budget option. find a decent used one freshen it up install it. has definitely better discs than optioned thirdgens had, and they have posi. if you want to drop a ton of cash into a rear then the possibilities are endless91 Trans am, 305, Lt1 cam, 24lb injectors, headers, SLP LM2, SW chassis, massive panhard, lowered, modded TPI, Tuned, 4.10s, Lincoln locked
85 Z28 406/th400?/3.42 4th gen disc rear/4th gen dash
00 Tahoe Z71........Stock
97 K1500 lt4 cam, 1.6s, MPFI, Solid axled, IROKs,------winter beater
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Obsessed

- December 28th, 2005
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- '87 305 IROC Z Bride nick named my ride as "The Ole Whore". IDK, jealous maybe?
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Ask your teacher???Originally posted by Bluedevil19 View PostWhile being in school learning everything fom metal work to enigine,
You want a powerful rear end... Rear ends do not produce power.Originally posted by Bluedevil19 View Posta powerful rear end with posi and disk.....
Your spelling is worse than mine.Originally posted by Bluedevil19 View Postgota be mo specific, dont know anything bout it yet lol
Like I said before you need to figure out what gear you have right now. Changing the gear to a higher numerical ratio usually results in better accelleration.
A ford 9" is a very popular choice but they are expensiveLast edited by bri2203; October 15th, 2011, 05:31 PM.
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Interior Whore
- January 21st, 2008
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- fred
- 1996 Camaro z28
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if you have an auto ive heard 12 bolts are more streetable, the new fad is moddifying ford 8.8's as well but that takes some fabrications work. auto 3.73s and if you have a manual i saw your building a 383 id go with a 4.10 gear ratio. best bet is to find a rear end specialty shop and go in and talk to them.wishing i could drive like joe and the atm squad
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aka "Plum Nuts"
- June 4th, 2008
- 5699
- Larry Meissen
- 1998 Trans Am convertible, 2012 Camaro V6 auto IBM
- Macomb, Michigan
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1st choice you need to make is: 1. do I want a cruise car, 2. do I want a cruise car and one I will occassionally take to the track. 3 do i want a car for primarily running on the 1/4 with very little street use. Each choice could mean a different rear gear ratio.sigpic
1998 Trans Am Convertible A4 - WS6 hood, WS6 air lid, WS6 rims, drilled/slotted rotors.
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that is a diff guy with the 383Originally posted by MunsterZ28 View Postif you have an auto ive heard 12 bolts are more streetable, the new fad is moddifying ford 8.8's as well but that takes some fabrications work. auto 3.73s and if you have a manual i saw your building a 383 id go with a 4.10 gear ratio. best bet is to find a rear end specialty shop and go in and talk to them."IROCZ86"
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number one but with posi lolOriginally posted by Plum Nuts View Post1st choice you need to make is: 1. do I want a cruise car, 2. do I want a cruise car and one I will occassionally take to the track. 3 do i want a car for primarily running on the 1/4 with very little street use. Each choice could mean a different rear gear ratio."IROCZ86"
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Post Whore
- November 8th, 2009
- 3000
- Tyler Porter
- 85 Z28, 91 Trans am
- Clinton Township Michigan
- student
- Send PM
if you run a 4th gen rear i dont think you can run your iroc rims either, could be wrong maybe someone else could chime in on that91 Trans am, 305, Lt1 cam, 24lb injectors, headers, SLP LM2, SW chassis, massive panhard, lowered, modded TPI, Tuned, 4.10s, Lincoln locked
85 Z28 406/th400?/3.42 4th gen disc rear/4th gen dash
00 Tahoe Z71........Stock
97 K1500 lt4 cam, 1.6s, MPFI, Solid axled, IROKs,------winter beater
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Post Whore
- November 8th, 2009
- 3000
- Tyler Porter
- 85 Z28, 91 Trans am
- Clinton Township Michigan
- student
- Send PM
the offset in the rear is all wrong correct? meaning those irocs will be pushed out really far?91 Trans am, 305, Lt1 cam, 24lb injectors, headers, SLP LM2, SW chassis, massive panhard, lowered, modded TPI, Tuned, 4.10s, Lincoln locked
85 Z28 406/th400?/3.42 4th gen disc rear/4th gen dash
00 Tahoe Z71........Stock
97 K1500 lt4 cam, 1.6s, MPFI, Solid axled, IROKs,------winter beater
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Correct, I believe the 3rd gen rear is 2" narrower than 4th gen. Thus requiring spacers for 3rd gens to run 4th gen rims, and 4th gens not able to run 3rd gen rimsOriginally posted by TylerT/AZ28 View Postthe offset in the rear is all wrong correct? meaning those irocs will be pushed out really far?
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