Brushing up on my Hurst Olds info for 1979 and need an answer

[azmusclecar]

As I was reading about authentication of a Hurst Olds 1979 I came across info which seem to be different.

I pulled this quote off one site

I believe that all of these cars had a 2.73 to 1 final drive ratio, regardless of if the axle was limited slip or not.

and then on another site It said......

The final gear ration may be 3.08 depending on options ordered or installed.



Silly me had the rear diff cover off a few months ago and didn't give it a thought to check it. I know I can roll the tire
and mark number of times the driveshaft goes in one rev but I was hoping someone could clear this up for me.
I'm dealing with a health issue that is unfortunately keeping me out of my garage and figured reading up on my ride
is as close as I can get to spending some quality time with it.

Thanks for the inputs and if you do have verified info can you state where it came from....

AZ

 

[azmusclecar]

Here is the info copied from the other site:

Drivetrain


Gearbox:
GM Turbo Hydramatic THM-350
Transmission type:
automatic

with manual shift mode


Number of gears:
3
Gear ratios (overall):






Torque converter factor:
2.25
Final drive ratio std:
2.73
optional:
3.08

 

[Jeff Blagden]

I have a 1980 442 the exact same car but no Hurst shifter they all came with 2.73 rear end same for 1979 there was no option on these rear ends on these cars

 

[azmusclecar]

One reason I asked was I saw on the You Tube GBody site the guy got scratch from the tires in 2nd gear.........he did mention a shift kit, so that
may have been installed, but with 2.73 and posi....I just couldn't see how he could bark the tires in 2nd gear.....and thought maybe his H/O
has the 3.08
That and I just wanted to know for my record.......
Odd with all that other site that mention the 3.08 was such a detailed specs website.......and for it to have the 3.08 makes me

 

[Jeff Blagden]

No chirping in second gear if all stock nice to drive on a Sunday but lucky to do a 16 second quarter mile ha ha have a good day Jeff from Winnipeg

 

[Huen79H/O]

My 79 has 2.73. I have had trans with shift kits the would bark between gears with 2.73 gear but it was shifting in to 2nd at 50 mph 3rd at 85 mph

 

[Huen79H/O]

The good thing about a 2.73 gear is 60mph is 2000 rpm with a turbo 350 trans

 

[azmusclecar]

My 79 has 2.73. I have had trans with shift kits the would bark between gears with 2.73 gear but it was shifting in to 2nd at 50 mph 3rd at 85 mph

Well the owner of the GBody You Tube channel I think DID mention a shift kit....so it must be that. Thanks for the verification....

 

[Jeff Blagden]

yeah I drive like a old man I baby her it only has 39000 kms so around 25000 miles

 

[azmusclecar]

The good thing about a 2.73 gear is 60mph is 2000 rpm with a turbo 350 trans

yea it's good to have highway gears out here in AZ where the speed limit is 75 and no one does that.........add 7 or 10 to that.

So I imagine somewhere around 2500 rpms is what I'll see if the tach and speedo agree.....