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Old 04-15-2006, 03:32 PM
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can I pull a 2:73 gear?

I have a 38 Chev sedan,striped down and slowly getting together.I have a 350 sbc,350 turbo and a GM 10 bolt posi with a 2:73 gear.The engine has a 4bl and a RV torque cam.I picked up the rear end cheap and it was the right width, never did find a Ford.I want mpg anyway, but keep hearing that the car will chug and get worse mpg or that I won't be able to pull the gear.I had a Vette once with a 3:08, big tires and I thought it ran fine.Does anyone know what this combo will run like? Or should I change anything? Thanks Cisco

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Old 04-15-2006, 03:43 PM
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I would say go ahead and run it the way it is and not worry about it..If the ratio does present a problem for you it can be changed at a later date..

I say that becuse a lot of GM cars came with that kind of setup from the factory..

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Old 04-15-2006, 03:55 PM
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That's the same set-up I have in my Olds, with the exception of an Olds 350, and it runs fine. I was looking at a different rear-end too and maybe someday I will replace the 273 rear, but for now it's good on the hiway as is!
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Old 04-15-2006, 04:24 PM
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Quote:
Originally Posted by TheCiscoKid
350 turbo and a GM 10 bolt posi with a 2:73 gear.The engine has a 4bl and a RV torque cam. Does anyone know what this combo will run like? Or should I change anything? Thanks Cisco
It sounds real good to me......The RV cam pulls on the low end of the power band....right where the highway RPM should be.....

Might be a bit lazy off the stoplight but should be great on the highway..

Everything is a compromise....
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Old 04-15-2006, 04:32 PM
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a higher number gear will always wake up a engine, off the line, with that said, you will save gas with 2.73
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Old 04-15-2006, 06:52 PM
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I'd run it.
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Old 04-15-2006, 11:13 PM
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Nobody has mentioned tyre height, stay under 29 inches and it will be happy.
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Old 04-15-2006, 11:21 PM
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can I pull a 2:73 gear?

When the rear end went out in my Suburban I found a 2.73 cheap and used it. It worked great for highway use which was about 80% of my driving. It was a bit of a dog in stop and go traffic but made up for it in gas mileage.
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Old 04-16-2006, 05:59 AM
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GM built millions of vehicles with a 350/TH350 and 2.73 gears. It won't be any stoplight bandit but it will be able to get out of it's own way and wil be able to cruise at Interstate speeds all day long. When I make the switch to a 383 in my PU I was going to swap out the 3.42 for a 3.08 but now I'm considering keeping the 2.73's that are with the posi I have for it. My PU has a Getrag 5 speed with a 4.01 1st gear and a 0.73 5th gear. The 383 should be able to pull that no sweat.
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Old 04-16-2006, 06:03 AM
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I run a 2:73 in my '32 pickup - with 460, mild cam, 750 cfm, and a 29" tire - and it pulls fine. It still guzzles gas...but would be a lot worse if I had a taller gear. I don't think you'll have any problems with it unless you really like snapping your head back at every stop light.
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Old 04-16-2006, 07:13 AM
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I ran that same combo in my truck for years...even pulled my house trailer with it....It works fine. I went to 3.55s a few years ago for "Out of the Hole" power. Then the price of gas shot up. Might go back.
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