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Discussion Starter · #1 ·
Has anyone had issues with a 4L80 swap ?
2001 trans am.
Since the swap I'm experiencing extreme shake at around 70mph + from the drive train.
Already tried a new balanced driveshaft. Transmission shimmed up but still not getting the angle alignment needed from trans to rear end.
The speed shop doing the Dyno and swap has run out if ideas.
Could not complete tunning on the dyno the shake is so bad.
And help would be appreciated.
 

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The same thing happened with my 02 Camaro. It originally had a T56 but we swapped it with a reman 4l80 from these guys, https://reman-transmission.com/transmission-codes/?code=4L80-E, along with a Moser 9in diff and a custom aluminum driveshaft. Sad to say that, after months and months of changing pinion angles just to find that it moved the vibration to a different speed range, we sold it. If you find out how to get rid of the vibration I would be interested to hear how you did it.
 
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