Vin number
Thread Starter
Burning Brakes
Joined: Feb 2011
Posts: 849
Likes: 0
From: Woodland California
Vin number
I'm trying to fing the gear ratio in my 75 Stingray.
Thought I'd run the Vin number and see what was up.
When I went to run the Vin I got an error message that it needed to be 17 numbers. My Vin is only 13 numbers.
The Vin # is 1z37j58428069
Any help on this?
Ralph
Thought I'd run the Vin number and see what was up.
When I went to run the Vin I got an error message that it needed to be 17 numbers. My Vin is only 13 numbers.
The Vin # is 1z37j58428069
Any help on this?
Ralph
Acct suspended by request 19 April 2011
Joined: Jul 2009
Posts: 478
Likes: 0
From: La Porte In
By gear ratio I assume you mean rear end. There should be a tag there with the correct ratio numbers. You won't find it in the Vin
Team Owner
Joined: Sep 2006
Posts: 31,170
Likes: 4,249
From: Westminster Maryland
Hi,
I believe that in 75 the rear ratio code of 2 letters was still stamped on the case along with a production date.
If you can find it, I'll bet that someone here can 'translate' it for you.
Regards,
Alan
I believe that in 75 the rear ratio code of 2 letters was still stamped on the case along with a production date.
If you can find it, I'll bet that someone here can 'translate' it for you.
Regards,
Alan
Race Director
Joined: Oct 2000
Posts: 12,639
Likes: 3,102
From: Shamong, NJ
1Z = Chevrolet Corvette
37 = Coupe Body (67 would be a convertible)
J = Base L-48 engine (T would be an L-82)
5 = 1975 model year
8 = you need to recheck this, it should be an "S" for the St. Louis assembly plant
4 = is a GM sequence number, that varied by year
28,069 = you have the 28,069, 1975 Corvette built (It was built approximately May 21st, 1975)
In 1975, the standard axle ratio with an L-48 4 speed was 3:36, with 3:08 as an option. With the automatic and an L-48, the standard ratio was the 3:08, and a 2:73 was optional.
There is a 2 letter code stamped on the bottom of the differential housing, just forward of the rear cover. It really can't be seen with the car on the ground, and can even br hard to read on a lift. This code indicates what the axle ratio is. Both "AX" & "LR" were used to identify a 3:36. "AW" is the code for a 3:08, and "AY" is the 2:73.
Race Director
Joined: May 2006
Posts: 18,662
Likes: 2,563
or jack up the back of the car, put it in neutral with the parking brake off, put a chalk mark on a tire and the drive shaft, and as you turn the tire 1 complete revolution count how many times the driveshaft turns
Thread Starter
Burning Brakes
Joined: Feb 2011
Posts: 849
Likes: 0
From: Woodland California
I looked with a flash light and could not see the numbers.
But it is 3 drive shaft turns to 1 tire rotation almost exactly.
I'll try again tomorrow to find the letters stamped on the housing.
To say the car is sluggish on the take off would be an understatement.
It idles at 40mph in 3rd, well a fast idle anyway.
What would be a good ratio for an automatic?
Looking for an all around ratio, not a 200mph ratio.
New rings and bearings
ZZ4 head
Voodoo Cam
Edelbrock performer intake
Summit headers
Lunati Voodoo cam
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,400-5,700
Intake Duration at 050 inch Lift 219
Exhaust Duration at 050 inch Lift 227
Duration at 050 inch Lift 219 int./227 exh.
Advertised Intake Duration 262
Advertised Exhaust Duration 268
Advertised Duration 262 int./268 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.468 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.489 in.
But it is 3 drive shaft turns to 1 tire rotation almost exactly.
I'll try again tomorrow to find the letters stamped on the housing.
To say the car is sluggish on the take off would be an understatement.
It idles at 40mph in 3rd, well a fast idle anyway.
What would be a good ratio for an automatic?
Looking for an all around ratio, not a 200mph ratio.
New rings and bearings
ZZ4 head
Voodoo Cam
Edelbrock performer intake
Summit headers
Lunati Voodoo cam
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,400-5,700
Intake Duration at 050 inch Lift 219
Exhaust Duration at 050 inch Lift 227
Duration at 050 inch Lift 219 int./227 exh.
Advertised Intake Duration 262
Advertised Exhaust Duration 268
Advertised Duration 262 int./268 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.468 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.489 in.
Acct suspended by request 19 April 2011
Joined: Jul 2009
Posts: 478
Likes: 0
From: La Porte In
You might email or call GM with the VIN. They could tell you. There should be a metal tag. Also depends on the year. The tag may be gone. I have a 78 which should have had a tag, mine is gone
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
There never was a 'tag'
Uhh, no it doesn't. No C3 had a tag.
Regards from Mr. Nasty.
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Race Director
Joined: Oct 2000
Posts: 12,639
Likes: 3,102
From: Shamong, NJ
I believe he was referring to the invoices that are available through the GM Heritage Center. You pay $50, and GM sends you an email pdf of your invoice.
Unfortunately, they are only available for 77 and newer Corvettes, and the original poster has a 75.
It seems that your (Mr. Nasty) responses to his post, have chased 78 C3 Light Corvette Blue off the Forum. He posted earlier today that he has requested to be removed from the Forum. I guess that he doesn't like to be corrected.
He left saying that there are too many babies on the Forum. I guess there is one less now!
Unfortunately, they are only available for 77 and newer Corvettes, and the original poster has a 75.
It seems that your (Mr. Nasty) responses to his post, have chased 78 C3 Light Corvette Blue off the Forum. He posted earlier today that he has requested to be removed from the Forum. I guess that he doesn't like to be corrected.
He left saying that there are too many babies on the Forum. I guess there is one less now!
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
It seems that your (Mr. Nasty) responses to his post, have chased 78 C3 Light Corvette Blue off the Forum. He posted earlier today that he has requested to be removed from the Forum. I guess that he doesn't like to be corrected.
He left saying that there are too many babies on the Forum. I guess there is one less now!
http://forums.corvetteforum.com/c3-t...my-choice.html
lit the fire, and my Mr. Nasty above fanned the flames.
Sorry, but I have no compassion or time for people that routinely spread blatantly false information.
You have 3.08:1 gears.
