good question!i've had cars with powerglides and cars with 2.73 gears.the combination is mind numbing!0-60 in 23.4 minutes!
but consider the economy factor,not to mention a bulletproof tranny.
wonder what the top end would be with a rig like that in an aerodynamic newer body style?
i can say (with a bit of embarrasment!)that i have shifted a powerglide from neutral to reverse at 50 mph while on a downhill roll!what a ride!the point is there was absolutely no damage to the car(68 camaro coupe)!the tranny made an awful grinding sound but showed no damage and ran perfectly!
those things are tough!
Eric B

 

Although more power than a 327... I had 2.73 (under work bench right now)and with my th350 at 6000rpm in first gear was right at 80 on my speedometer,shift to second and bury needle easily. I did a on-line math thing and got a top speed of something like 162?
Was fun playing with ricers on the hiway, throw down in first, go WOT,and bark tires at 55 just to serve as a wake up call, not all muscle cars can't run on the hiway (rpm limited).

idon'tknow, what might be the date code your looking for ? I have a 2.73posi under work bench (for just in case).

 

I think the reason could be weather, ie snow and slipping in northern states.

 

I think the reason could be weather, ie snow and slipping in northern states.

"Dead on", years ago (in the days of rear-wheel-drive cars) up in this area it was a lot easier getting around in bad weather, if you had two back wheels pushing instead of one. Thanks, Gary in N.Y.

 

Thanks Doug G. but, I'm not looking for a 273. I'm looking to get away from the one I have. What I would like to find is something like bt. 307 & 355. A 331 would be ideal. Especially if I eventually get the TKO. I can understand a 273 open end. I just don't really see someone wanting to order one as a posi unit. The weather in the N.E. seems like a good answer though.

 

The 2.73 10 bolt was the standard axle for a 327 with a powerglide transmission in 67. Posi (G80) was an $40.00 option in a 2.73 axle (G97) which is fairly steep in relation to the price of the car back in the day, but if you needed posi for snow or mud or whatever it was a probably worth it. Either that or it was a way for the dealer to tack on some extra profit.

 

I figure it's a "Dealer mark-up, traction and economy" deal back then too!!!

I ordered our '77 AMC Mantador 4-Dr., 258 auto car with h-d suspension AND posi...

I think it even had a GM 8.5" center section rearend with the old stle AMC, splined and nutted, axle ends and hubs on it.... I do know it had a MOPAR 904 automatic in it..

Great old "stately-looking" car AND the kids loved for me to do donuts in the snow in the supermarket and mall parking lots when the snow was about 4" deep later in the evenings.. He, He!! have trouble doing that with a front wheel drive car nowadays!!!

pdq67

 

My '77 nova came with a 2.56 posi :clonk:

 

have trouble doing that with a front wheel drive car nowadays!!!

pdq67

Not in reverse Discovered the reverse doughnut in my Mom's brand new Ford Tempo back in '86. Crank the wheels to the stops one way or the other, put her in reverse, and that lil sucker would spin like a top . . .

. . . or so I am told.

 

My 67 FB OHC 6 came with a PG(ST300) and a 2 series open rear end(2.53/2.73 I'm not sure which). It ran the 1/4 at the local strip at 90 mph and an ET of a few minutes, but it did'nt up shift from low range until after I went through the traps! For economy, the car does get 26 mpg. I'm thinking of putting in a switch pitch trans and upgrading with a 2 series posi. Good combo?

 

Richmond gear makes special thinner ring gear sets for use with the 2 series posi carrier in a 12 bolt axle, I don't know if they do the same for a 10 bolt. You might ask them. My 10 bolt positraction was so tight the car would squeal the tires just driving around a parking lot. I was glad to be rid of it and get a 12 bolt, much nicer posi.
David

 

I got a 2:73 rearend in my 86 Scottsdale truck and it has the TH350C that has a lock-up converter. This thing loves interstate cruising.

 

My friend's 96 Z28 came with a 2.73 posi. This was pretty standard for 4th gen automatic f-bodys. With a 26" tire, 0.70:1 4th gear and 2.73's this thing had serious top end capabilities. 30mpg on the hiway is nice too!

 

I must be in serious need of a engine rebuild.. I bought a '69 Camaro in october. Originally straight six, now with a 350 with TH350 and 2,73 Non-posi rear end. It runs about 14mpg on hiways

And it's a pretty shaky ride at speeds around 70 to 80 miles

 

My 2.73 open with a th350, B&M torkmaster converter, and mild 355 loves the highway. Hits 100 from 50 in no time. I will upgrade when I can afford a 5sp.

 

I run 2.73 posi in my '80 Malibu with a Super T-10 w/3.42 first gear. Car does real nice on the freeway. My 1/4 times ain't too bad either 13.8 @ 100 mph.

John

 

Well yea, on the plus side of the 273's: I have a completely stock 1967 327/275hp with a power glide (1 to 1 ratio, [I think] on the highway). I can fill up my tank in Dallas & go down to my brother's in San Antonio. That's approximately 300 miles. When I get down to S.A. I have about an 8th of a tank left. That's a good bit better than my 68 camaro used to do with a Goodwrench crate engine that was about 210hp & 273's.