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3.73 re-gear

Sour_Squirrel

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Donstar Senior Enthusiast

Donstar

Posted
Posted
3 hours ago, KARNUT said:

Tire technology was a little more advanced than that. I can remember going with my pops to get Michelin tires on an 65 Electra 225.


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Yes, my fathers '64 Ford Galaxie 500XL 390 4 barrel (300 hp) had the AM radio with reverberator!  LOL

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redwngr Senior Enthusiast

redwngr

Posted
Posted
7 hours ago, KARNUT said:

Tire technology was a little more advanced than that. I can remember going with my pops to get Michelin tires on an 65 Electra 225.


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Sure, Michelin's been around much longer than that, but in 65 they wouldn't have been radials on a NA production car.  

 

 

 

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

I raced on bias ply tires. Bought them as long as they sold them. Early radials were not what they are today and even back then bias wasn't that bad. 

 

The 6L80 has a very low first gear. 4.03:1 with a second gear close to that of an old four speed close ratio. 2.36:1 and then it has two stages of overdrive. 0.85 for fifth and 0.67 for sixth. Third and fourth are 1.53:1 and 1.15 respectively. The C6 automatic in my first Ford had a 2.46 low gear, 1.46 second and direct drive third. The Ford with the 3.0:1 rear end then had an overall ratio of 7.38:1 in low gear or about the same as the 6L80 does in second (7.62:1) with the trucks 3.23 rear gear. In low this trucks low gear over all ratio is 13.02:1. To get a first gear that low back in the day I needed a rear gear of 5.36:1! ( put a 4.30 in her later)

 

With the 390's 401 ft./lb. torque and 7.38 low gear this 4500 lb. car had a wheel torque of 2958 ft./lb. The 305 ft./lb. torque of my 4.3 six banger coupled with it's 13.02 low gear supplies 3971 ft./lb. to my RCSB that weighs a few hundred pounds more, 300 to be exact. The Ford needed a 4.11:1 gear to equal the low gear thrust of this pickups low gear launch. A similar result could be obtained with an Impala or C10 with a 396 and a TH-400 on a 3.08 gear. 

 

Once out on the road at 70 mph the Ford of old needs to turn nearly a thousand rpm faster (2675 rpm) that the current Chevy (1690 rpm).

 

The Chevy at 2/3 the displacement and spinning 2/3 the speed gets nearly twice the MPG and lives over twice as long but acts like it's actually powered by a bigger motor than yesteryears 390.  

 

It isn't better oil or better metallurgy or better heat treats that makes the new ones last longer and feel more powerful. It is straight up math and physics. The rest is smoke an mirrors. (marketing)

 

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

I ran 373s back in the day. HWY speeds back then was 55. Impalas and novas mostly small blocks.


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zach1990 Senior Enthusiast

zach1990

Posted
Posted

I had 3.73s with my old truck on 315s. Felt like a dog. Wished the entire time I owned it that I would have regeared

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