Where would I get a new speedo gear for my 700R4. I need one for 3.73 gears. Thank you guys

 

figure out which one(s) you need. there's a tech article about it. there's also bizillions of previous posts about it. There's even a program that somebody posted once to help you figure it out.

then you can get them at www.gmpartsdirect.com

if you need the 45 tooth as the driven gear, you will need a different carrier for the gear. however, the part number the tech article lists for this is wrong. you can have your local dealer order the right one, they should be able to get it.