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1988 chevy blazer, 700 transmission, will not shift into drive nor overdrive, it acts like it goes into neutral, all other gears reverse etc. seems to be fine, all fluids have been checked and changed. What is the problem here?
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Disconnect shift cable from transmission linkage and try to manually put transmission in drive gear ( make sure wheels chocked/park brake on ). If transmission goes into drive gear, suspect a shift cable or shifter assembly problem. If you can't manually shift into drive gear by hand with cable disconnected, suspect internal transmission/shift linkage issue
It sounds like when you accelerate it downshifts and acts like it is in neutral, when you let off, it shifts back to coast like it is in drive. I would question shift solenoid first. I know this is what 1-2 shift solenoid can act like if you have no low 1 and starts in low 2 or 2nd. There are two solenoids, 1-2nd and 2-3rd. You can drop pan and change them easy.
The D inside of an O is for overdrive. It is an automatic overdrive transmission. There isn't an overdrive button on it. If you want to disable the overdrive you have to shift down a gear.
sounds like 3rd gear clutch is out (it might have blew out a lip seal or something)
pull the pan c if there is a lot of black on the bottom of pan (no 3rd = no 4th either) the 3rd gear clutches are engaged along with the 4th gear clutches to make overdrive
if the tcc cable is out of adjustment it mite shift at wot (wide open throttle) max rpm (5000-5500)
if it just 1,2, neutral its probly clutches
Sounds like the car is just slipping out of gear. Keep your hand on the shifter when you back up next time. See if you can feel the shifter move when the car comes out of gear. If the shifter moves up when it happens keep pressure on the shifter holding it back like you dont want it to move forward. And of course if the shifter moves back when it comes out of gear, put forward pressure on the shifter so it doesnt slip out. This might work for now but but i know i wouldnt want to spen 700 for that ****. Let me know how it goes.
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