In case you're thinking about a 4L80E...

[davepl]

I backed myself into a corner by choosing gears (4.88s) that require overdrive, since I was going to use a 200-4R I had on hand. Had that rebuilt and it lasted 48 miles (but 3 years, so no warranty).

So I decided on a 4L80E, basically the original TH400 but with overdrive.

Of course you need a computer to run that.

$650 KA-Ching.

But the computer doesn't work without a throttle position sensor.

$250 Ka-Ching.

And your speedo doesn't work without a speedometer control unit.

$500 KA-Ching.

And so it goes. That TH400 is looking pretty good right about now! I sure hope this thing works and drives well. The good news is that the TH400 is not my favorite shifting trans anyway, so maybe the 4L80E with the electronic control and accurate TPS (not a kickdown switch) will be nicer. Hope so!

But I'll be into it for about $2250 on the trans, $1200 for computer stuff, and probably a couple of thousand to install it, since I don't have a trans jack and these are too heavy to bounce around on a floor jack (I've bench-pressed powerglides into place, but these are heavy!).

- Dave