1999 chevy truck VSS code and shifting problem

First time on site so let me see if I know as much asi think -well I have seen qustions close to mine.problem is with a 4L60E (16-bolt pan) it is in a 1999k-1500 4by4 with a 5.7L or 350CI whatever you want to call it. I scaned it and got a po500 & 501.

I think it been a while back anyway it said it was the VSS and the other code said low input to the VSS- vehicle speed sensor.so now the coupe'degra I bought the trk late 04 and got lots of maint recp 1 for a new trans & transfercs so now the symtoms with eng warm or not put in dr start rolling & no spdomitr (then I can tell it will only dr in 1st &2nd)so I go 1 mile or 15 just easeing along then shut it off maybe 5or30 min start it up put in drive move40ft spdomitr starts working trk shifts fine so what is it ?

I've been told just the vss to the whole trans bad (also can anyone tell me where the vss is located at on that trans or case) been told 25 diff places on that to thank you for the info!

I wish I could tell you it's a pinpoint item. But, cars don't work like that any more. Your transmission is probably NOT your problem. There is a gear in the trans-system that turns the VSS sensor. the vss sensor sends the signal to the instrument cluster. the instrument cluster then sends the signal to the ecm. You could have a bad sensor, a bad cluster or a bad ecm. (Not to mention wiring) You will need to have a scanner and a graphing dvom or a lab scope. you have to look at the signal coming out of the speed sensor and watch the scanner to see if the vss is not sending the signal or it is sending a signal but the ecm is not getting it. The instrument cluster may be dropping the signal.