I currently have a vibration when I take off and once I get on plane it dissipates but when ever I get on the gas it becomes more noticeable. I have went thru the pump and all good there. I have adjusted the degree pitch of my motor as well (did that several times). I had new u joints put in last summer when I fixed the seals on the motor. Could it be my u joints? Possible incorrect ones? I am currently at a loss and any help would be much appreciated. Thx.


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Sounds to me like the drive line splines are too deep into the pump and the yoke is bottoming out under power.

There should be 1/4"-3/8" of free movement on the yoke splines from bottoming. Major engine damage could result if left unattended.

Not saying for sure, but what it sounds like to me.

Another thing to look for is a cracked flywheel/flexplate or a broken motor mount.

Good luck.

GT

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X2 ☝🏻️☝🏻☝🏻 check this


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I had the same issue once after having my motor rebuilt. Turned out that the flywheel that was replaced was wrong.


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Any chance you flipped the flex plate around backwards?

What drive line assembly? Have a picture?

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Gt don't some of those driveshafts have to be "clocked" a certain way? Maybe he has it say 180* out when putting in the new u joints? Just thinking out loud...


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Yes, but unless it's a splined shaft drive line, it would be very difficult to do. Typically it's very difficult to blow it on a double cardan deal.

GT

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Gotcha... just thinking out loud...


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The flex plate was not removed when the motor was pulled out. I just pulled the motor to do all of the seals since it sat for a few years.


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Here is a pic of my drive shaft assembly. It has an "H" Bar.


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Anybody else see it?

First off, the engine alignment is in the wrong ball park.... Not even close.

Second, what retains the joint caps on the splined yoke?

GT

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I 1st noticed the H bar angle up which didn't seem correct, then the cap looking like it's working it way out due to the missing retainer. Pretty close to a much bigger issue.

First thing I said to myself...well that ain't right... I knew you would set him straight GT.

1977 Challenger