Rear end gears
Thread Starter
5th Gear
Joined: Jul 2006
Posts: 5
Likes: 0
Rear end gears
I recentaly bought a 1987 corvette rear for a custom project im doing.... However im unaware of what gears are in it. I was told when i purchased it, that everything was stock. I know there is usually a tag that says the gear ratio but it must of been ripped/taken off
Anyone have any ideas
http://www.streetsourcemag.com/issue...PM26481_tn.jpg
Anyone have any ideas
http://www.streetsourcemag.com/issue...PM26481_tn.jpg
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 34
From: The Top of Utah
You should have a "Service Parts Identification" tag on the underside of the lid to one of your rear compartments or your console lid. Look for an option code starting with a "G". Ignore "G92". Any other "G" code will designate the ratio the car was built with. Also the ratio that was installed in the diff at the factory is stamped on the bottom of the diff. As a last resort, you can jack up the car, turn both rear wheels through one revolution, and count the drive line revolutions.
RACE ON!!!
RACE ON!!!
Thread Starter
5th Gear
Joined: Jul 2006
Posts: 5
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sorry bro i just have the rearend so as far as the console goes i cant do that but i never looked on the bottom so tomorrow ill go out and check that out there is a lable on one of the half shafts that has a bunch of numbers ill post that also
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 34
From: The Top of Utah
Originally Posted by laydoutjimmy
sorry bro i just have the rearend so as far as the console goes i cant do that but i never looked on the bottom so tomorrow ill go out and check that out there is a lable on one of the half shafts that has a bunch of numbers ill post that also
RACE ON!!!
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
DUDE i didnt notice from your opening post that you didnt have the whole car there is no factory tag on either of the halfshafts so anything you find there is not original information the turning of the shafts is the most reliable way of finding out the true ratio in case it has ever been changed
RACE ON!!!
RACE ON!!!
one-ups-manship on non-punctuated run on sentences totally knarly dude i sure am glad you are back to your old self CFI-EFI far out man
Race Director
Joined: Jan 2005
Posts: 10,641
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From: Slidell Louisiana
On the C4 rears I've seen the gear ratio is engraved on the diff. If you clean up the rear and look hard you may seen the ratio. Here's what the numbers on a D36 look like. My D44 is similar:
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Mine didn't have numbers on the casing.
I would check it by turning the pinion until the axles make a full revolution. If it turned 3 times, you've probably got a 3.07, etc.
If nothing else you can pull the cover off, on the ring gear the ring and pinion tooth counts are on there.
Like 40 13 etc. 40/13 = gear ratio.
I would check it by turning the pinion until the axles make a full revolution. If it turned 3 times, you've probably got a 3.07, etc.
If nothing else you can pull the cover off, on the ring gear the ring and pinion tooth counts are on there.
Like 40 13 etc. 40/13 = gear ratio.
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Brett Foote
Safety Car
Joined: Apr 2001
Posts: 3,525
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From: Houston TX
For '87, the factory ratios were:
auto (D36)
coupe - 2.59 or performance ratio of 3.07
convertible - 2.73 or performance ratio of 3.07
std (D44)
coupe or convertible - 3.08
I am going by memory, but I think the above is correct. I hope you know whether the car was coupe or convertible, and D36 vs D44 is easy enough to determine. If all else fails, count the rotations of the input shaft (drive shaft) as a complete rotation of the output shafts (connect to half shalfs) is done.
Aaron
auto (D36)
coupe - 2.59 or performance ratio of 3.07
convertible - 2.73 or performance ratio of 3.07
std (D44)
coupe or convertible - 3.08
I am going by memory, but I think the above is correct. I hope you know whether the car was coupe or convertible, and D36 vs D44 is easy enough to determine. If all else fails, count the rotations of the input shaft (drive shaft) as a complete rotation of the output shafts (connect to half shalfs) is done.
Aaron
Thread Starter
5th Gear
Joined: Jul 2006
Posts: 5
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well i have the rear end completely torn apart and the center section on jack stands. However i didnt feel like flipping it over so i just turned it, I turned the pinion one complete time and the half shaft turned about .4 of a a turn....
Any ideas fellas?
Any ideas fellas?
Thread Starter
5th Gear
Joined: Jul 2006
Posts: 5
Likes: 0
Alright bro thanks.... whats a good set of gears to go with for jsut street cruising
Im actually putting this rearend in a 1995 gmc jimmy body dropped on 22's it has the stock 4.3v6 with a the heads cut down .020 and headers
I know it aint a ls1 or ls6 but im only 19 and on a budget hahah
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Alright bro thanks.... whats a good set of gears to go with for jsut street cruising
Im actually putting this rearend in a 1995 gmc jimmy body dropped on 22's it has the stock 4.3v6 with a the heads cut down .020 and headers
I know it aint a ls1 or ls6 but im only 19 and on a budget hahah
Im actually putting this rearend in a 1995 gmc jimmy body dropped on 22's it has the stock 4.3v6 with a the heads cut down .020 and headers
I know it aint a ls1 or ls6 but im only 19 and on a budget hahah
What tire size? And what are your tranny gears? Need that info first.
Race Director
Joined: Nov 2000
Posts: 17,103
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From: stop the fun suckers
with a jimmy i'm assuming an automatic.. the v6 is a bit underpowered compared to vettes.. I would guess you would be happy with a gear in the range of 3.45-3.73 (the lower getting more milage the higher having more pep..)
good luck!
good luck!
Le Mans Master
Joined: Apr 2005
Posts: 8,077
Likes: 4
From: Scarborough ONTARIO
pete k is selling 3.73 in sale section, it has new seals, spider gears and over all reworked, and everyone knows pete k he is damn good with these stuff, and the price is just right.
