Can you get rear end ratio from VIN?

[Coach529]

Found a Gen 2 F Body parts car to steal a rear end from. The snow was too deep and I was too lazy to crawl underneath it yesterday to see if it had a tag.

Is it possible to pull the rear end ratio off the VIN?

Thanks Fellas!!

[mechanixman]

As far as I can tell, I'm afraid you can't.
This website should show you what exactly your VIN says.

http://53truck.ez15loan.com/howto/vin.htm

[swizzlestick]

dont most gm cars have rpo codes in glove box? they tell you all the options

[Garys8]

2nd Gen Fbody (If I'm reading your post correctly) has build sheets on the top of the gas tank (forget that) and behind the upright rear seat. Although some years vary, what year is the car?

[Garys8]

And too bad you're not closer since I have a bunch of those rear axles. I'd give you one. I just can't bring myself to junk any of this stuff. Someone has to need it!

[mechanixman]

Oh, my bad.
I didn't quite read that correctly.
But here's a diagram of where all the VINs are on the truck.
(just in case)

What year is the parts car?

[NEWFISHER]

Coach,
I just logged onto Dealer Global Connect and the vin is no longer supported by GM. Grab the "G" codes on the glove box sticker and we can help.

[Coach529]

Originally Posted by NEWFISHER

Coach,
I just logged onto Dealer Globac Connect and the vin is no longer supported by GM. Grab the "G" codes on the glove box sticker and we can help.

Thanks Fish.........I will check it out!!

[FiftyTwo]

This should help.

Camaro/Firebird
Service Parts Label Identification Label is located in the center console, below the console door. It includes the vehicle identification number, a listing of option codes, paint type, paint code, and an interior trim code.
Example Option Codes:
AQ9 Adjustable Custom bucket Seats
AU3 Power Door Locks
CC1 Removable Glass Hatch Roof

Here's what you want to look for:
Axle, Rear 3.45 Ratio GM3
Axle, Rear 2.73 Ratio GU2
Axle, Rear 3.08 Ratio GU4
Axle, Rear 3.23 Ratio GU5
Axle, Rear 3.42 Ratio GU6
Axle, Rear 3.27 Ratio GW6
Limited Slip Differential Axle G80
Axle, Performance Ratio G92

[Coach529]

Anybody know the width on a 86 Fire Bird rear end?

[mechanixman]

I know an 89 is 62 inches, I think its the same width.

[FiftyTwo]

I came up with the same as Mechanixman, 1982-92 should be 62" backing plate to backing plate.

[Coach529]

Which is the exact same as a AD truck right?

[mechanixman]

Not quite, from center (of wheel/tire) to center, it's 61 in the back. So your wheels would stick out maybe a 1/4 to a 1/2 on either side.

[Coach529]

Swung by the scrap yard today on my way home....of course with no tools. They had slipped the Trans Am over for me. I could not find a code on the axle. Could not find any G codes inside either.

I did not have any tools to pull the diff cover. I could not unbolt the driveshaft either!! I did find a couple nice 5 bolt steels wheels as rollers and a couple more tailgates though!!

GM 10 bolt anyway........

[mygirlz55]

On the camaro rearend I have I found the stamped letters/numbers on the passenger side of the axle housing. Found the ratio and coding info at nastyz28.com.
Hope that helps you some.

[Coach529]

Originally Posted by mygirlz55

On the camaro rearend I have I found the stamped letters/numbers on the passenger side of the axle housing. Found the ratio and coding info at nastyz28.com.
Hope that helps you some.

Thanks....I will check again.

My research is not turning out positive. Only two gear rations were available that year on a Firebird. 3.42 and 2.73. 3.42 would work........but I am afraid 2.73 would be way too tall.

[mygirlz55]

Looks like my rear end is a 2.41:1 which is on the high end and they made it that year for "fuel economy".
I might start looking for another rearend, possibly something with a posi in it.

[Coach529]

Originally Posted by mygirlz55

Looks like my rear end is a 2.41:1 which is on the high end and they made it that year for "fuel economy".
I might start looking for another rearend, possibly something with a posi in it.

I plan on upgrading to a T5 transmission in the next year....so a 3.40-3.70 gear ratio is what I am shopping for.