Nate came up and helped me pull the 4l80e from the donor truck. Looks like a legit trans as advertised and the torque converter appears to be new.
It has a tag on it but no idea where it came from.
It's certified by someone!
I also got some good news for the electronic control. I was reading about the problems you can have with Doublers and Magnum Box behind a 4l80e. The transmissions uses 2 speed sensors to detect slipping in the transmission. On a 4wd there's a sensor at the front of the trans and your typical sensor on the tcase. The problem is with a Doubler or Magnum there are additional low range gears you can't program into the controller so it's going to think the trans is slipping in the other low ranges. I had no idea about this and that most people try to use a 2wd 4l80e because of it. The 2wd version has both speed sensors in the transmission.
After some searching and reading I found that the earily 4wd 4l80e came with the 2 sensors in the case just like the 2wd. The catch is they didn't necessarily have the rear tone ring. We pulled the rear sensor and found mine does have a tone ring.
Front:
Rear:
The only negative is the speed the transmission thinks the truck is moving at will not be accurate in low range, but I don't see that being a problem. I don't need speed for the EFI and I use a GPS speedometer.
While Nate was up he brought me an NP205 from an 1980 K20. It's 32 spline input so it'll work with the Magnum. I have a 10spl NP205 I can rob the fixed output yoke from.
Next step will be to buy some new stuff, no more recycled parts. I need to get the controller and shifters tcase and Magnum.
I'm torn between cable shifters or good old fashion mechanical linkage.
