I have seen the receipt of purchase and the guy i bought the car from showed it to me when i was purchasing the vehicle. It was his "deceased" sisters car. I'll see if i can get a carfax or sumthing dun to retreive that info again.

 

Carfax won't tell you the rear axle gearing. And neither will your trim tag on the firewall.

You need the car's buildsheet. A 'receipt' won't tell you a whole lot. You can find the buildsheet by taking out the back seat. It should be visible under the springs of the cushion (thats where mine was.) The assembly line worker will usually put the build sheet either under your back seat or on top of the gas tank.

The buildsheet will tell you exactly what the car has for rear gears.

I still maintain your Berlinetta did not come from the factory with a 3.73 rear gear. However, I'd love to be proven wrong on this and would welcome you to post your scanned buildsheet so we can take a look at it.

Dave

 

Gonna hafta look into that soon....installing a subwoofer soo ill take a look for that.Thanks for the help. Much appreciated.

 

Dave I think you could order a 4psd car with optional 3.73 gears with a Z-28 package?

 

Ok boys I got my Camaro White Book out. What are we looking for LMAO

 

Ok with regard to wheels. RPO N80 is the aluminum wheel package and was available on the Berlinetta, Rallye Sport and Z-28. Those wheels can be color keyed as well. I can also check my original sales broshure. White Book mentions option G92 the performance axle ratio but doesn't say what that is. To my knowledge axle ratios as follows. 2.41 2.56 2.73 3.08 3.42 and 3.73. This depends on the model and year and engine combo. This does not include dealer installed options which can happen.
Without looking really hard, I understand it as follows.
Z-28 from 78-81 3.08 or optional 3.42 with auto and 3.73 with 4spd.
Sport Coupe 6cyl = 2.56
267 and 305 could see the ugly 2.41 (typical on 267's) or 2.56 or 3.08 Typically 305's with 4psds have 3'08s
Saled Broshure doesn't say much in it. Ok I wanna know who has one with a FACTORY CB in it LMAO!!!

 

That is true, and is not the issue here Charles. Scroll back a page or two on this topic, I already mentioned the Z/28 could be had in 1979 with a 3.73 gear and 4-speed. The issue is whether or not you could 'special order' axle ratios such as the 3.73 gear on a model like the Berlinetta. Because of CAFE regs in the US and Federal EPA requirements certifying each engine/transmission/rear gear ratio packages prior to sale, to the very best of my knowledge, you could not order special deeper gears in any Camaro outside of what was offered from the factory, in a given model year.



No, not quite. 1979 was only 2 axle ratios with the Z/28: either 3.73 with the 4-speed manual (close-ratio), or 3.42 with the TH350 automatic. That was it for the Z, in 1979.

In 1980 things changed. The 4-speed was no longer a close ratio, and because of more stringent CAFE fuel economy requirements (Corporate Average Fuel Economy), you got the 3.08 gear with the Borg-Warner Super T-10 4-speed manual (with 3.42 1st gear ratio) - which gave the same rate of acceleration as the close-ratio 4-speed/3.73 gear combo from 1979 but with a few MPG better mileage in top gear at highway speed - or the 3.42 posi
with the automatic transmission.

Dave

 

MY camaro is the best!!! In the sig!!!!!!!

 

I could be wrong, but the previous owner showed me a document for my vehicle. It stated that my vehicle had a 3:73 in it and it was a document from the dealer it was purchased at. Could have been a replacement but i was under the impression it was factory equiped.

 

wow ur pretty high on ur self.

 

You say it runs 12.5 at 120 in on your site

 

hmmmz


i know someone that goes

12.1 @ 116


i dunno about that there.... 12.5

 

Also says on that page the car went high 10's - low 11's. Well something ain't adding up, unless it was using a ton of nitrous and slicks. Somehow I don't see a daily-driver Pontiac 400 running high 10's, though.

Otherwise, a nice car.

Dave

 

Also in '81 some camaro's received computer command control and lock up torque converters. 2&3 in the Z-28 and only 3rd in other models. Wide ratio trans MM4 shows as the 4psd starting in '80 in the White Book. M21 is the close ratio and doesn't show up in 80 or 81. Weird science at Chevrolet.

 

The LM-1 350 for US market Z/28's recieved the CCC and L/U converter. Canadian cars did not.

The wide-ratio is the Borg-Warner Super T-10 with 3.42 first gear, which - as I posted - replaced the Muncie M-21 in 1980. This was when GM began using the 3.08 rear gearing behind the 4-speed transmissions in the Z/28.

Dave