New 4L60 (YEA!) and speedo problems... :(

[RedBed]

Just picked my truck up from the mechanic. He swapped my TH350 out for a 4L60. Works great and happy I did it. Hopefully the extra MPGs will help pay the bill.

About halfway home, the Speedo quit working. And I did speak to the mechanic and he will fix it later in the week, but I thought I'd ask about it first.

As I said - it worked, then didn't work. No noise, and the cable was recently lubed.

I unhooked it at the transmission side, spun the cable, and the speedo works. What would cause it to quit working inside the transmission?

When I removed the cable from the trans side, a very small wire ring (like a clip) fell out, so I have it in an envelope.

Any ideas? I might fix it myself if I can.

Also - He said it is currently 17/37 speedo gears. When my speedo reads 60, my GPS speed is 57. So would that mean I need to maybe a 17/36 setup?

THANKS