85 corvette
Thread Starter
6th Gear
Joined: Sep 2009
Posts: 6
Likes: 0
From: houston tx
85 corvette
ok guys i just got my 85 vette auto, i traded my 87 iroc and my ar15 for it!!
what size is my rear end? is it posi? what is gear ratio? and what gear ratio should i replace it with?
what should i know about my car(problems)
car is stock except straight exhaust, really loud to(original owner put tru duals to center of car wit drop offs no cats), but what can i do to add hp?? all input will be appreciated
thanx
what size is my rear end? is it posi? what is gear ratio? and what gear ratio should i replace it with?
what should i know about my car(problems)
car is stock except straight exhaust, really loud to(original owner put tru duals to center of car wit drop offs no cats), but what can i do to add hp?? all input will be appreciated
thanx
Racer
Joined: Aug 2009
Posts: 496
Likes: 4
From: Cordova TN
ok guys i just got my 85 vette auto, i traded my 87 iroc and my ar15 for it!!
what size is my rear end? is it posi? what is gear ratio? and what gear ratio should i replace it with?
what should i know about my car(problems)
car is stock except straight exhaust, really loud to(original owner put tru duals to center of car wit drop offs no cats), but what can i do to add hp?? all input will be appreciated
thanx
what size is my rear end? is it posi? what is gear ratio? and what gear ratio should i replace it with?
what should i know about my car(problems)
car is stock except straight exhaust, really loud to(original owner put tru duals to center of car wit drop offs no cats), but what can i do to add hp?? all input will be appreciated
thanx
Thread Starter
6th Gear
Joined: Sep 2009
Posts: 6
Likes: 0
From: houston tx
no mods done to my iroc just exhaust and intake
Thread Starter
6th Gear
Joined: Sep 2009
Posts: 6
Likes: 0
From: houston tx
Thread Starter
6th Gear
Joined: Sep 2009
Posts: 6
Likes: 0
From: houston tx
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Thread Starter
6th Gear
Joined: Sep 2009
Posts: 6
Likes: 0
From: houston tx
Team Owner
Joined: May 1999
Posts: 22,830
Likes: 13
From: Columbus Ohio
CI 3-4, 8-9-10 Veteran
St. Jude Donor '06-'08-'10
On late model C4s the D36 came from the factory with automatic transmissions. D44 was standard with manuals. No idea if the same held true in 85
Try here for more details
Try here for more details
Racer
Joined: Jul 2004
Posts: 351
Likes: 3
From: amarillo tx
1985
hi, one of the best ways to find out how your 1985 was equiped is to look at the rpo code list. you will find a small white sticker with alot of 3 digit codes like j55, kc4, and so on printed on this sticker. it will be stuck on the bottom of the compartment lid behind the seats or on the bottom of the center console lid. it will be about 2" by 3" in size. make sure that the vin number on the sticker is the same as the vin number on the car. if you can find it, post the codes for all to see. you can also search this forum under an rpo search and find them posted in another thread. see ya
Last edited by blkzr1; Sep 13, 2009 at 02:37 PM. Reason: add info
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
If it has a G44 RPO code, then its a 3.07. Otherwise it will be a 2.59.
Welcome to the 85 club. You'll find there's a few differences from the later years. The codes are located on the underside of the rear compartment lid. Write em, down and post them here. We can tell you what you bought.
If your 85 is truly stock, you're looking at 230 Hp if tuned properly. A major difference with later years is that you have cast iron heads. GM went to aluminum heads midway thru the 86 year. So new aluminum heads should be near the top of you performance list.
Welcome to the 85 club. You'll find there's a few differences from the later years. The codes are located on the underside of the rear compartment lid. Write em, down and post them here. We can tell you what you bought.
If your 85 is truly stock, you're looking at 230 Hp if tuned properly. A major difference with later years is that you have cast iron heads. GM went to aluminum heads midway thru the 86 year. So new aluminum heads should be near the top of you performance list.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Read the Sticky C4 technical summary and FAQs at the top of the page.
There really are not any meaningful cheap mods for this car. Don't fall for the crap products that claim big power improvements. Valve train, porting the intake, and exhaust are the easiest to do. A 3.07 gear set will help your stop light times.
There really are not any meaningful cheap mods for this car. Don't fall for the crap products that claim big power improvements. Valve train, porting the intake, and exhaust are the easiest to do. A 3.07 gear set will help your stop light times.
Burning Brakes
Joined: Apr 2008
Posts: 1,179
Likes: 5
From: Lake Orion Michigan
Hi and welcome,
I too have an 85 and after try everything....
K&N air filter, Magnaflow SS exaust and Smooth air inlet, ported and polished plenum, ported and powdercoated runners and Hooker ceramic super comp headers and airpump delete...So far I would say I have gotten it to around 300 horsepower it has woken up a lot with these mods. My next mod is a new roller create motor.
I too have an 85 and after try everything....
K&N air filter, Magnaflow SS exaust and Smooth air inlet, ported and polished plenum, ported and powdercoated runners and Hooker ceramic super comp headers and airpump delete...So far I would say I have gotten it to around 300 horsepower it has woken up a lot with these mods. My next mod is a new roller create motor.