Stock Rear end Ratio for 1982...please help

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Apr 10, 2007 | 12:35 PM

1982CorvetteDude

Thread Starter

Melting Slicks

Joined: Jun 2005

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From: Arkansas

Stock Rear end Ratio for 1982...please help

Is the stock rear end ratio for a 1982 Corvette with a 700r4 automatic 2:87:1 ?

Please confirm this

Thanks again!

Apr 10, 2007 | 01:02 PM

mooneyd

Drifting

Joined: May 2004

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From: Flanders NJ

Actually it was 2.78:1 and the Collector's Edition was 2.87:1.

Apr 10, 2007 | 01:53 PM

moosie982

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Joined: Oct 2000

Posts: 3,547

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From: Carbondale Pa.

A bit of a hijack,,,

Whats the ratio for a 1980 L-82 turbo 350 ? anybody know? Because when I go to the 100megs free place they list it as 3.55:1 and I will soon (as soon as I find my motovation) I will be putting together a '82 with parts and pieces from the "80. And adding a BW T-10 4spd. Thanks,,,Peace,,,Moosie

Last edited by moosie982; Apr 10, 2007 at 01:59 PM.

Apr 10, 2007 | 01:56 PM

OregonVette80

Burning Brakes

Joined: Jul 2006

Posts: 830

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Quote:

Originally Posted by moosie982

Whats the ratio for a 1980 L-82 turbo 350 ? anybody know? Thanks,,,Peace,,,Moosie

Hey Moosie, odd you should ask. Because in one publication our 1980's have 3:55 and on another it says 3:07

Owners manual says 3:55 but everywhere else I've read 3:07's
I've been told there's a way to jack up rear & spin the wheel to determine...I haven't quite been able how to figure that out yet...Slow learner

Apr 10, 2007 | 02:00 PM

Rich N.

Instructor

Joined: Sep 2006

Posts: 154

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From: Upper Darby PA

mark (chalk or such) a rear tire carefully inline with a fixed point, eg the top of fender well. spin the tire one full revolution. count the times the driveshaft turns. three full turns- 3:07, three and a half- 3:55, etc. good luck, Rich

Apr 10, 2007 | 02:11 PM

OregonVette80

Burning Brakes

Joined: Jul 2006

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Quote:

Originally Posted by Rich N.

D@MN!!! Thanks Rich

"D'oh" It sounded much more complicated when it was explained to me before

Apr 10, 2007 | 02:15 PM

Glensgages

Race Director

Joined: Jan 2003

Posts: 15,177

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From: State of Confusion

Quote:

Originally Posted by mooneyd

Actually it was 2.78:1 and the Collector's Edition was 2.87:1.

my Black exterior/Dark Red interior '82 had 2.87s before I swapped to 3.73s:
I believe the other gear ratio available was 2.72:1.....

Apr 10, 2007 | 02:17 PM

moosie982

Safety Car

Joined: Oct 2000

Posts: 3,547

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From: Carbondale Pa.

Quote:

Originally Posted by OregonVette80

Either that or find where the code is stamped on the case, it was my understanding that automatic L-82's had 3.55's and the 4 spd's ? had the 3.07's. I know that when my car was on the road it accelerated pretty good and tach'd up pretty high at highway speeds,,,,,,,,crs as to what #'s though. Anybody know for sure? Peace,,, Moosie

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Apr 10, 2007 | 02:42 PM

MN-Brent

Le Mans Master

Joined: Apr 2001

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From: Minneapolis, Mn USA

I read once that there was a link between getting the N90 aluminum rims option and the 2.87 rear.

If you did not order the N90 rims, then you got the 2.78 rear gears.

It was not only CE models got the numerically higher gear.

Apr 10, 2007 | 02:49 PM

#10

Ken73

Melting Slicks

Joined: Aug 2000

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From: Sealy Texas

Cruise-In III Veteran

I pulled the rear out of my '82 just a few months ago to bump mine up to 3.23's and the originals were 2.87. I also bought a spare diff and it was a 2.73 (confirmed on the actual gearsets.) I believe those were the two options available.

Apr 10, 2007 | 03:09 PM

#11

Glensgages

Race Director

Joined: Jan 2003

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From: State of Confusion

Quote:

Originally Posted by MN-Brent

I read once that there was a link between getting the N90 aluminum rims option and the 2.87 rear.

If you did not order the N90 rims, then you got the 2.78 rear gears.

I had read that (N90 wheels + 255/60R15 + 2.87:1 came only as a unit, while Rally wheels + 225/70R15 + 2.72s were standard, with no deviations ) from 2 different sources, and repeated that here (maybe you saw one of my earlier posts? ), but I have since seen window stickers, showing N90-wheels w/ 225/70R15 tires, so I am not-sure that wheels/tires/gear-ratios had any influences on each-other, and I don't repeat my prior comments.
:o

Apr 10, 2007 | 03:43 PM

#12

Mikes*Corvettes

Pro

Joined: Oct 2006

Posts: 564

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From: London

2.72:1 Standard Wheels
2.87:1 Aluminum Wheels

according to this

http://www.corvette-world.com/corvet...tification.php

Apr 10, 2007 | 09:07 PM

#13

mooneyd

Drifting

Joined: May 2004

Posts: 1,442

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From: Flanders NJ

Quote:

Originally Posted by Dell Boy

2.72:1 Standard Wheels
2.87:1 Aluminum Wheels

according to this

http://www.corvette-world.com/corvet...tification.php

That must be it, I thought the CE was the difference. Any case it one or the other

I put 3.55's in mine.

Apr 11, 2007 | 11:42 AM

#14

Wrecked82

Le Mans Master

Joined: May 1999

Posts: 6,692

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From: Texas

Quote:

Originally Posted by mooneyd

Actually it was 2.78:1 and the Collector's Edition was 2.87:1.

Except when I had my non-Collector edition rear end replaced with a 3.55, was told it had a 2.87 in it, per stamp on gears or something.

Edit - did not read all posts before I posted. Have aluminum wheels, hence the 2.87.

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