[James Lamb]

I literally just did this a week ago on my '89 Suburban. I got tired of 700R4 transmissions pooping out if I glanced at them while frowning, and had an electronically controlled and beefed up 4l60e put in. But because mine has a mechanical speedometer cable, and on a 4 wheel drive the speedo signal comes off the back of the transfer case, I needed something to send the signal to the new transmission. The good news is it was like $50, AND I can adjust it so that me speedometer finally reads correctly due to the oversize tires I run.

For a two-wheel drive I think the speed signal comes off the tail piece of the transmission. I will look tonight because I can't remember the vendor. But I called them, told them what I was doing, and they told me exactly which part # I needed. Hopefully it's that simple.

Also, my 700r4 had no electrics, so I had to buy an aftermarket controller for the new transmission.