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Old 08-24-2003, 12:09 PM
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Not hitting 3rd?

1977 Chevy Truck with retrofitted 454. Transmission is a 400.
As far as I know the transmission and torque convertor are stock. Fluid levels are good.

When truck was purchased, the transmission pan wasn't tightened up, which leads me to believe that someone was inside it recently.

I took the truck for a VERY short drive yesterday, and it doesn't feel like it's hitting 3rd. When I let off the gas, it feels like it's "dragging" almost as if I downshifted...doesn't feel smooth at all.

Also, when I look at my torque convertor/flex plate from the side, with truck idling, in park...it looks "loppy" and the flex plate is vibrating like crazy...I'd imagine this isn't normal, but I haven't dealt with this before...is something amiss?

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Old 08-25-2003, 05:28 PM
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http://mysite.verizon.net/vze2wgju/flexplate.mpg

here's a video clip of the flexplate/convertor movement. it's only about 10 seconds long. Right click, save as...about 3 megs big so I don't recommend anyone using a dial-up modem to view.

thanks.
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Old 08-25-2003, 06:32 PM
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I looked at the video for several minutes just to get focused in on it.
It looks like the torque converter and flexplate are moving way more than normal.
The flexplate may just be bent and need replacement. To be on the safe side you might replace the pump bushing, and I don't even have to say it- the seal.
If you have a shop near by have them check the runout on the converter.

Now the part about not hitting third is a totally different situation.
I would just take it apart since the trans has to come out anyway and visually check everything, and install a transgo 1&2 kit if it all looks ok.
Since I'm not a pro and I'm no good at trouble shooting my general answer is 'take it apart and check it all visually'.
A th400 is about the easiest one to take apart.
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Old 08-25-2003, 10:07 PM
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thanks for the input...I was hoping it wouldn't come to this.
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Old 08-25-2003, 11:00 PM
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If the second part of that clip was with the motor idling, I would say to check the endplay on the crank. Did this motor come out of a vehicle with a standard transmission?
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Old 08-26-2003, 07:19 AM
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motor appears to be a "Marine Inboard" manufactured in 1988, retrofitted into 1977 Pickup.
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