Originally Posted by boomguy
Ready to burn this thing, broke the sun shell, purchased another trans, installed now it has reverse and 1st, will not shift into second unless i am turning like 4000 rpm or I manually shift it, will not shift into drive or over drive.. also think that my vss is bad cause my speedo quit working... Any help would be much appreciated..
Welcome to Hotrodders. I edited the thread title to remove ''help'' , the members here are a smart group.
If your speed-O does not function, your PCM will not know the vehicle is moving and will not shift the transmission.
you may need to fixed - replace the VSS first. I also suggest you check the fuses in both fuse panels if the 1999 tahoe has 2. Check the simple stuff first.
Regarding The replacement trans, do you know this is good unit or a junkyard unit that is ''warranteed'' ?