84 rear ?
Thread Starter
Melting Slicks
Joined: Jul 2000
Posts: 2,107
Likes: 14
From: Lancaster PA
84 rear ?
I have found a rear out of an 84 with 3.31 gears. Will this fit in my 94 automatic and would this be a good ratio to run. I do about 3-4 track days a year and quite a bit of autocrossing and I'm looking for a little more acceleration off the corners. Thanks guys
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
I dont see any really good reason as to why it wouldnt fit yeah. The whole unit should fit in exactly as the other one comes out. If you have a 2.59:1 then that change to 3.31 would certainly make it much quicker off the line. 
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
I think there may be 2 or 4 bolts, like for the camber adjustment cams, that are a different diameter and may have to be drilled out for the larger bolts. That is a driveway operation. Then after that, it's a bolt in. The whole operation is a weekend driveway project. That diff was a pretty rare find. There were only 410 cars built with the 3.31:1 gears.
RACE ON!!!
RACE ON!!!
Bench Racer
Joined: Feb 2003
Posts: 4,201
Likes: 15
From: Palm Beach Gardens FL
St. Jude '03 thru 14,'25
Originally Posted by CFI-EFI
...That diff was a pretty rare find. There were only 410 cars built with the 3.31:1 gears.
RACE ON!!!
RACE ON!!!
Burning Brakes
Joined: Aug 2005
Posts: 1,239
Likes: 0
From: North Central Indiana
I would really like some new rear end gears. Mine is stock GM1 - 2.59. I would love to find a Dana 44 but don't have the funds at the moment. What are the best gears I can fit in the rear end I have ?
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Bench Racer
Joined: Feb 2003
Posts: 4,201
Likes: 15
From: Palm Beach Gardens FL
St. Jude '03 thru 14,'25
Originally Posted by Scott-89
Just for the street. I just want a little more pep when I punch it. It will barely turn over the tires now. It feels strong I just want it to be a little quicker.
Burning Brakes
Joined: Aug 2005
Posts: 1,239
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From: North Central Indiana
Didn't realize the options were that limited. I read in another thread that 3.07 was a good choice for an Auto. I don't want to race it, and I drive conservative. I just want the pep you get from a better gear ratio.
If I ever want more than stock with the mild mods I would really want a D44 and I may go that way in the end just because its not a ton more price wise for a good upgrade and more options.
Thanks
If I ever want more than stock with the mild mods I would really want a D44 and I may go that way in the end just because its not a ton more price wise for a good upgrade and more options.
Thanks
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
3.07 is a good option. I am a drag racer and can tell you from experience: 3.73 will make your l98 (auto)feel faster. 3.07 will make it run faster. This is drag racing situations only. I have no other racing backround. The beauty of the 3.07 ratio is you can often find complete pumpkins for as little as $100. Add free labor, fluid and new speedo gears and $150 is a real low possible number. ThIS is why I often recommend it.
Melting Slicks
Joined: Sep 2003
Posts: 3,326
Likes: 1
From: I live at www.domesticlugnuts.com I sleep in PA
Originally Posted by CFI-EFI
That diff was a pretty rare find. There were only 410 cars built with the 3.31:1 gears.
RACE ON!!!
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Rich & Lisa_84
That sucks. We have 2 of them. That means when I break mine, I'll probably be S.O.L.
RACE ON!!!
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by Scott-89
Didn't realize the options were that limited. I read in another thread that 3.07 was a good choice for an Auto. I don't want to race it, and I drive conservative. I just want the pep you get from a better gear ratio.
If I ever want more than stock with the mild mods I would really want a D44 and I may go that way in the end just because its not a ton more price wise for a good upgrade and more options.
Thanks
If I ever want more than stock with the mild mods I would really want a D44 and I may go that way in the end just because its not a ton more price wise for a good upgrade and more options.
Thanks
I had a factory G92 (3.07:1) in my 87 when i had it, and it was quicker up to at least 35 MPH than my 400 BHP LT1 94 with a base 2.59. I reckon in terms of fuel economy it was just as good or slightly better if youre doing alot of town driving. 2.59:1 has only proved better on the highway and only for fuel economy,but city MPG seemed better with the 3.07:1 even with the L98.
Bench Racer
Joined: Feb 2003
Posts: 4,201
Likes: 15
From: Palm Beach Gardens FL
St. Jude '03 thru 14,'25
Originally Posted by Rich & Lisa_84
That sucks. We have 2 of them. That means when I break mine, I'll probably be S.O.L.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by tobijohn
Nope. Motive Gear sells Dana 36 3.31 ring & pinion sets. At least according to their catalog...
Who knows how much effort is it to reprogram the 94 computer to work properly with a different rear end ratio in the autos? Does the computer shift the auto based on engine revs or vehicle speed? Cause if the computer governs shifting points by speed then its not going to be a simple task is it.... But then i havent looked into this yet and have no idea what exactly the computer shifts by....
Drifting
Joined: Nov 1999
Posts: 1,324
Likes: 18
From: St. Peters MO
Originally Posted by Casethecorvetteman
Who knows how much effort is it to reprogram the 94 computer to work properly with a different rear end ratio in the autos?
Sometimes they be be purchased "used" in the classifieds, or, they still sell them new from all the usual Corvette Vendors as well.