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Old 02-05-2002, 04:21 PM
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Post gears too low?

i have a 79 corvette it has a t350 trans and a smallblock 350. i just bought the car for xmas and wondering how do i lower my rpms at highway driving withought changing my rearend i have no idea what it is geared at so maybe you guys could help me with that too. on highway driving i am at 4500 rpm at 70mph.

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Old 02-06-2002, 10:04 AM
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Old 02-06-2002, 05:48 PM
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Brian, the first thing you do is verify the engine speed (RPM) that your factory tach is displaying. At 70, that car should'nt be running much more than 2500 RPM. Get a hand held test meter with Tach, hook it up, run the cables around and through the drivers window, and take off down the highway. Unless someone change the gears to 4.56, you'll soon find the answer.
Oh, if it would have 4.56 gears, it should be a rocket from stop light to stop light!
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Old 02-07-2002, 03:20 PM
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I'm wondering if it is shifting into final drive. Those RPM's are way too high for street. You can check the gear ratio very easily. Jack up the back end and put a block under one wheel so that only one wheel turns. Then turn your remaining free wheel one full revolution counting how many times the drive shaft turns. Divide this by 2 and this is your drive ratio. You could also pull off the differential cover (I think your going to be doing this anyway) and the ring gear has the ratio stamped on it (4.56.1). I'm guessing that somebody has taken a serious interest in racing your toy in the past. Don't worry, ring and pinion sets are not expensive.
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