Need diagram for 1976 chevy pick up auto trans. shift indicator diagram

I am not certain as I have not done this actual swap, but since the 318 was an option I would think it would be a drop in swap.

take it in to an auto transmission specialist shop for a proper diagnosis there is a band piston in a housing that has a habit of cracking and the band will not work effectively and from your description , that is indicated

could you edit your post and add what kind of diagram you are looking for? ie., what part or parts?

shift solenoid for third gear maybe bad up inside the transmission pan

Here you go.

The neddle is attached to the column via a thin metal wire and spring which then clips to the edge. Remove the trim above the column and look for the clip attached to the wire and a warn spot on the column and reattach it. :)

That does sound like a linkage adjustment problem.

If that does not work, I'd try a fluid change and filter. But your diagnostics with pulling on the gear shifter is a pretty good indication of a linkage problem.

Speed sensor and neutral safety switch need to be checked and or replaced.

Not a lot to go on here! But, Sounds like this has an auto trans? If it has, get a socket on the front crankshaft pulley nut, turn the engine just a bit back an forth. If you hear a metal to metal 'clunking', then remove the inspection cover at the front bottom of the trans. Now move the flywheel with a screwdriver, you will find that the flex-plate is loose or broken. If its a manual trans, None of this applies! Frankster016

i have a 1976 c10 350 4bbl and it dont want to stay on