C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

A bit unwanted fishtail

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Old 06-16-2003, 04:39 PM
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Southern Comfort
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Default A bit unwanted fishtail

Sometimes when I do a hard accel and it shifts into 2nd it seems the rear wheels are not syncronized and it fishtails a little bit. Not so much a burn type but like something is out of adjustment. Does it goin around corners when it happens to shift gears in the turn mostly from first to second even in a mild acceleration. Any help?
Old 06-16-2003, 04:43 PM
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Strick
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Default Re: A bit unwanted fishtail (Southern Comfort)

Here is a shot in the dark, how is the posi doing? Maybe a clutch slipping?
Old 06-16-2003, 04:57 PM
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vader86
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Default Re: A bit unwanted fishtail (Southern Comfort)

Does it shift hard or make a clunking sound of any kind?
Is there any whine from the rear?
Old 06-16-2003, 05:38 PM
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buzzbomb
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Default Re: A bit unwanted fishtail (vader86)

Jack up the rear end, and see how much play there is in the wheel, when pulling on top and bottom. Sounds to me like your wheel bearings, I had the same symtoms. I replaced them and all is well now. :cheers:
Old 06-16-2003, 06:20 PM
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speedjohnson
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Default Re: A bit unwanted fishtail (buzzbomb)

Many folks work real hard to achieve that kind of "problem". Try buying better tires!
Old 06-16-2003, 06:34 PM
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h rocks
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Default Re: A bit unwanted fishtail (Southern Comfort)

It's either the toe rods, the camber bushings, the wheel bearings or a combination. Tell us more after you jack it up and check for play in both vertical and horizontal positions.
Old 06-16-2003, 06:50 PM
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Southern Comfort
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Default Re: A bit unwanted fishtail (Southern Comfort)

well when I had the tranny rebuilt because my TC self destructed they put in a "Gil Younger" shift kit. Said they had to or replace the valve body. So it shifts real crisp. I just replaced the hub/bearings. During normal Accel it works great. :crazy:
Old 06-16-2003, 07:29 PM
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BAM92
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Default Re: A bit unwanted fishtail (Southern Comfort)

Does the rear end kick out to the right on upshifts? Or both directions.
Old 06-16-2003, 08:06 PM
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Southern Comfort
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Default Re: A bit unwanted fishtail (BAM92)

I think to the right.
Old 06-17-2003, 02:32 AM
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BAM92
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Default Re: A bit unwanted fishtail (Southern Comfort)

If it kicks to right on hard upshift this seems normal. I believe it is due to the gyroscopic effect of the rotation of the engine, transmission and drivetrain. When tires brake loose at same time this effect causes the rear to slide to right. Watch the drag racers on tv or at track and you will see this. My 89 auto did it on 1st to 2nd upshift.
Old 06-17-2003, 02:42 AM
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Default Re: A bit unwanted fishtail (Southern Comfort)

I had a tranny rebuild with a shift kit and 2,000rpm TC and my '88 kicks out on hard acceleration and I just love it. I was passing a truck the other day, forced a downshift into 1st and she "waved" her tail at him on the 1-2 shift.

Going around a corner is even more prone to do it as the tires are lifting a little.

Try running about 32psi in the rear tires; I find that best for hookup.
Old 06-17-2003, 11:30 AM
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Southern Comfort
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Default Re: A bit unwanted fishtail (65Z01)

Based on what I am hearing it is probably normal. No noises or clunks or abnormal stuff.

Thanks all :seeya
Old 06-17-2003, 12:07 PM
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War Machine
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Default Re: A bit unwanted fishtail (65Z01)

Try running about 32psi in the rear tires; I find that best for hookup.
I'll have to try that. :thumbs: I usually keep the tires around 35psi and if I jump on the gas, God forbid I do it around corners :rolleyes: , the fish tail is so severe that it'll just do donuts! :crazy: :crazy: :thumbs: I always figured it was just the sticky track surface that helped that out, but maybe the 32psi and lower had a helping hand there too. ;)

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