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internal/external balance, 28/50oz ?

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Old 08-21-2009, 11:49 PM   #1
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Default internal/external balance, 28/50oz ?

i have a 79 f150 302 c6 trans., it needed a new motor so i got a good long block out of a 94. the motor is in and it runs but any rpm above idle it shakes the whole truck. some research has told me the 81+ 302s are extenaly balanced. so i put the 94 harmonic balancer back on, and its still fine at idle but shakes everywhere else.

could it also be the flex plate? could i have it clocked wrong? how do i know where the flex plate weight should be in relation to the crank, i cant find in any of my service manuals anything about it.
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Old 08-23-2009, 02:55 AM   #2
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what fly wheel u use you cant use the 79 on the 94 i believe
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Old 08-23-2009, 09:43 PM   #3
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i had the 79 flex plate on. i was under the impression from a friend that if u use a matching flex plate and crank balancer u should be fine, which i now know is wrong.
i got the flex plate off it today and the 94 flex plate would work except the fact that it would pull the converter out of the tranny about 1/16'', because its for a AODE and not a c6.
im gona call some parts stores tomorrow and go from there
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