The reason I went with the 4l60 is because Speedtech said with that trans, I would not need to modify the tunnel like I would with the 6l80 that I preferred.
I was willing to go with that trans to avoid any tunnel work.
A CV driveshaft isn't recommended by two different shops I asked to hopefully avoid the angle issue. Both said the weight would cause transmission damage due to this.
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1971 Firebird
2017 SS
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