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You can get the plug at any transmission shop. Specs are gonna vary, there are a few different ways to do it. I used a 2wd 4l80, tall 400 to 205 adapter (fig 8). I had adapter machined, changed the plug & cut down the output shaft of the 4L80. I also have the rare (91 only) factory...

I posted on here to complement True Knights write up & detail not to hijack his post. I will start my own build thread soon. Back on subject: Whether your doing a diesel or gas build, I think its much cheaper to buy a complete vehicle. (im not knocking True Knights way of building.) I...

Great write up. I just started a vortec 350/4l80/205 repower & after seeing yours, I cant wait to get it done now.