Detail: A 1999 suburban 1500 4x4 speedometer is not working and the gauges are jumping on take of on takeoff it feels like it's in 4th gear if I manually shift it than it shifts the trans has been rebuilt .
Solution: Who rebuilt the trans ? , Hi, A 6ya expert can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US. The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones). click here to download the app (for users in the US for now) and get all the help you need. Good luck! , take it back to the shop you had build it and have them fix it. if its newly rebuilt then there should be a warranty with it , Did it not work right after the rebuild or did it work for a while then quit? , run the fault codes and look for a problem vehicle speed sensor (VSS)