New Section for Steering Topics - Impala Tech
 
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post #1 of 11 (permalink) Old 04-06-2012, 11:11 PM Thread Starter
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New Section for Steering Topics

Thank you for creating this section for steering topics.
Jim

Last edited by JIML82; 04-07-2012 at 06:42 AM.
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post #2 of 11 (permalink) Old 04-06-2012, 11:17 PM
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Steering woes

I am having steering troubles... When I go, to wide open throttle, on my 427-425 Impala, the back end goes way over to the right!! When I turn the wheel to correct, the back goes way over to left! I tried it over, and over and its always the same Could it be a ball joint??
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post #3 of 11 (permalink) Old 04-06-2012, 11:29 PM Thread Starter
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I think that it is your right foot.
jim
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post #4 of 11 (permalink) Old 04-06-2012, 11:41 PM
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prompt response

Jim! thank God! I thought it might be mechanical! My wife was screaming so loud, I could not tell... you are right, my 66 427-425 Vette on skinny tires was the same way......
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post #5 of 11 (permalink) Old 04-07-2012, 06:33 AM
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funny post.
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post #6 of 11 (permalink) Old 04-07-2012, 09:03 AM
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We all need some humor... I just got a 67 Impala SS on Thursday its a Iowa sold 327-275 factory 4 speed... It has standard steering....It was suggested to add a later model power steering box what year and up, would give me variable ratio ??
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post #7 of 11 (permalink) Old 04-07-2012, 09:58 AM Thread Starter
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Modern fast ratio power steering gears have either 12.7:1 or 14:1 straight ratios (i.e. The same gear ratio from on-center all the way to full lock.) These gears typically have heavier effort valves in the gear.

Older Chevrolet B-car power gears (1965 - 1969) had ratios around 17.5:1 - and had "pinky finger" light effort steering. Around 1969 variable ratio gears began appearing in Chevrolet B-cars. The variable ratio gears were still quite slow right on center (16:1) but quickened as you turned the steering wheel to full lock (12:1). The faster ratio at near full lock reduced the total number of steering wheel turns but the steering was still pretty slow and doggy right on center. These gears also tended to be "pinky finger" light effort.

One thing else to remember, your older B-cars had gears that were "full travel". In other words the pitman shaft would rotate something like 86 degrees in order to move the linkage and steering knuckle to full lock. Some people make the mistake of trying to install a Camaro or Firebird fast ratio gears into their B-cars. The F-car gears have restricted travel to match the Camaro/Firebird suspension geometry. The F-car pitman shaft rotates roughly 70 degrees compared to the 86 degrees in a B-car. If you install a restriced travel F-car gear into a full travel B-car you will find that your turning circle begins to approach that of a Greyhound bus.

That is why you need to obtain a fast ratio (12.7:1), full travel gears from the following vehicles in order to upgrade the steering in older B-cars:
1885-88 Monte Carlo SS (not quite full travel but close)
1988-94 Chev B-car with F41 or FE2 suspension
1992-94 Chev B-car police
1995-96 Chev B-car with police, FE, FE2, or FE3 suspension
1985-87 Buick A-car Grand National
1992 1/2 - 1998 Jeep Grand Cherokee

Jim
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post #8 of 11 (permalink) Old 04-09-2012, 12:30 AM
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Carl, you can't control your car now! Why would you want faster steering?


Tom

1965 Impala SS Tahitian Turquoise 427 4 Speed
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post #9 of 11 (permalink) Old 04-09-2012, 09:18 AM
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Why?

I figure If I can get faster steering left and right I can make shorter sets of tire marks!! right now its 800 feet squealing to the right then 800 feet squealing to the left I need shorter cooler S marks
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post #10 of 11 (permalink) Old 04-09-2012, 09:51 AM
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Good to see Jim on the Impala forum. His papers helped me rebuild my C3 t/t steering column.

Thanks for all the help on the Corvette Forum Jim.
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post #11 of 11 (permalink) Old 04-26-2012, 08:20 AM Thread Starter
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My first car was a new 1965, 396 Impala. I ordered it the day they became available to order in February 1965. Has always been my favorite car.
Jim
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