Its the valves in the valve body,depending on how bad their stuck you can get a solution(on ebay) that can release the gum in the valve body.if the problem isnt severe it should work ,if so drain tranny fluid and put new filter in with another dose of tranny solution.this willremove the gum out of the fluid so it doesnt happen agian.this has worked for about ten people i have recomended it to. so good luke.this will cost you under 100$,better than about 2500$
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There are normally several shift solinoids 1st 2nd, 3rd 4th. one solinoid operates 2 gears. They are located inside the gearbox, you will need to remove the sump & determine which one you need to replace.
I don't have the shifting schematics for THIS vehicle .
However, they are available in the vehicle's repair manual. If you obtain this manual look for what is common between 2nd gear, final drive and overdrive this is your problem.
Remember they source of the problem may require a rebuild of the transmission. You may want to save some time and just give it to a repair shop.
No 3rd or 4th gear: “3-4” clutches are worn out. R&R. The car is safe to drive (in 2) until you can get it fixed.
Trans shifts into gear harshly, car feels sluggish off the line, No
1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only
available gears, CEL is on: Transmission is either in limp-home mode or
has lost electrical power. If there are lots of error codes in the PCM,
check the under hood fuse that powers the transmission, and if it pops
again, look for a short in that circuit like an O2 sensor harness
touching exhaust. Otherwise, check PCM codes for a particular fault in
the transmission causing the PCM to put it in limp-home mode.
No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD
and locks the converter : Shift A solenoid failed. Easy fix in the pan.
Or a wiring problem from PCM to trans.. or PCM.
Check to see if your transmission is in the limp mode, which would only give you 2nd, 3rd and reverse gears. No 1st or 4th gear.
i have heard that the ignition switch can be faulty and not let the full voltage thru to the electricaly controlled 4l60e trans.i have the same problem with my 95 1/2 t. i rigged a switched wire from the fuse block via a relay to the proper wire on the trans....ask a trany tech and they will know what im talking about,,,good luck