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Old 02-10-2012, 09:30 PM
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shakes at stop

Been having some trouble with my 75 k20. Lately when it gets warmed up after driving for 20 minutes or so it does a learching studdering thing when taking off from a stop in drive or reverse. Driving it today and after a half was sitting at a signal totally stopped and every 5 10 seconds could feel the truck vibrate. The motor is new 350 maybe has 500 miles on it, but with the other symptoms I have a feeling its the trans. The truck shifts firm going through all the gears while driving but does a double clunk sometimes going to reverse. Its a turbo 400 supposed to have been rebuilt before I got the truck. Not sure if this is a trans issue or a torque convertor issue. If the trans is shot does anyone have an opinion either way on swapping in an sm465 np205 in place of the 400/203 I have now?

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Old 02-11-2012, 08:52 AM
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I'm just gonna take it to the tranny guy see what he says. Least these are too spendthrift to rebuild.
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Old 02-11-2012, 09:59 AM
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I think you may have an engine tune problem or a camshaft not compatible with the torque converter.

Transmission dont really make a vehicle shake at an idle unless there is a balance problem with the converter as it spins or a cracked flex plate
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Old 02-11-2012, 10:43 AM
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Like a miss probably? Huh. It did have a miss before but did a full tune up and fixed it. This shake happens only after its been driven for a bit. Ok thank you, got me thinking about it differently now.
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Old 02-27-2012, 09:47 AM
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So I have to ask this cause I have looked and looked and cant find my answer. I'm trying to fix this slight miss when truck is warm on my new 350. So the motor came from gm with the valves adjusted do I need to readjust them now that I have some miles on the motor cause I hear that the valves being off some can cause a miss. I just can't find if its common practice to readjust valves after motor has been run after new or with less than 200 miles on it?
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Old 02-27-2012, 09:51 AM
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Meant 2000 miles sorry
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Old 02-27-2012, 11:44 AM
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On the GM crate racing engines, we take all the valvetrain off and check after finding out the hard way about some lacking in the assembly process. Loose studs, missing shims on aluminum heads, missing seals, and broken seals among the problems.
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Old 02-27-2012, 11:59 AM
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Ok so I will be safe and just adjust them. Thank you. Sorry I didn't realize I had this in the trans section still.
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Old 02-27-2012, 01:47 PM
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Something else....if you thinks it's a miss try checking your plug wires. Sometimes on a new installation a random wire can get partially burned through and start shorting out when it gets warmed up and expands the cracked insulator.......just a thought.
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Old 02-27-2012, 02:10 PM
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This is the second set of wires on this new motor Haha. The first time I had a really bad miss I changed dist, plugs, wires, bought the nice protective jackets for the boots and the miss went away except for after driven for a half hour or so. Then I get a miss and studded off idle when I drive it and I can feel the miss like at a stop light. I'm puzzled so I was thinking valve adjustment.
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Old 02-27-2012, 02:25 PM
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Thank you 327nut
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