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Transmission problem

Transmission problem, will not shift lever. If car moves while on P, then the interlock will not disengage. I car doesnt roll at all it will allow me to shift gears but if the cars rolls just one inch then i cant shift gears. Already replace brake sensor.

Make, model, year, miles?

2002 trailblazer, 186000 miles.

TB uses the 4l60E trans. has cable operated shift lever assy on driver side. there is an adjustment tab that can get off a bit. i had my trans out last week so i know all about it.

Is it on top next to the shifter or below by the transmission

Underneath. Bracket is bolted to side of trans next to lower pan seam. Easy to reach.

Ok thanks will check on it