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#1
05-03-2007, 01:39 PM
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Speedo correction
on my 86 firebird I bought it with huge tires in the back, and th350 trans swapped in aleready.
problem is my speed reads double what im going, the Rear tires are 275/60/R15 could this taller tire be part of my speedo problem? Im buying stock rims soon with right sized tires. is there a gear or a dif cable I can switch in the trans to correct the speedo?
__________________
1987 Chevrolet Caprice classic Brougham. 142,000 on the 305 and still chugging 
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#2
05-06-2007, 10:40 AM
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Re: Speedo correction
My guess would be your rear axle gears have been changed or the transmission expects a different axle ratio and tire combination. The speedometer gears must not be right for the tire size and axle ratio you have.
I drive a 1982 Trans AM 350/350 and my winter tires are 275-60-15. When im going 45 MPH the speedo reads 40 MPH. To figure out what drive/driven gears you need you will have to know what the axle ratio is, and what tire size will be used.
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#3
05-06-2007, 06:10 PM
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Re: Speedo correction
I know my rear gear ratio is the stock 3.42, what drive gears and tires do I use with this?
__________________
1987 Chevrolet Caprice classic Brougham. 142,000 on the 305 and still chugging
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#4
05-06-2007, 06:22 PM
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Re: Speedo correction
Quote:
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