Transmission loosing gears when driving

[99burban2018]

I have a 99 suburban and on first start up I have no issues it runs and drives great but after about 10 mins of driving when it starts to warm up i loose all gears and acts like it's in neutral but if I wait a few mins and start it back up I have all gears again then a few mins while driving I loose them again I have no idea what's going on any suggestions

 

[Nad_Yvalhosert]

It's hard to read your wall of text without punctuation or paragraph breaks try to edit and provide us with additional info like any tests you've done have you checked the fluid level how many miles what speed does this issue occur have you taken it to a transmission shop what the codes in the computer help us help you.

 

[NickTransmissions]

I have a 99 suburban and on first start up I have no issues it runs and drives great but after about 10 mins of driving when it starts to warm up i loose all gears and acts like it's in neutral but if I wait a few mins and start it back up I have all gears again then a few mins while driving I loose them again I have no idea what's going on any suggestions

Check or replace your vehicle speed sensor, it could be going bad. If you do and the problem persists, yank it out for overhaul. Whether its a 4L60 or 80, false-neutral while in gear is either VSS intermittent failure or wiped clutch packs.