Question about 1983 Toyota Pickup

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83 toyota pickup s10 auto, usually will shift into overdrived after driving a few blocks, but quit shifing mostly a few days ago. tried changing plug and spark wires as it was spark jumping and rough idle, thought it might have decreased vacuum, which might have affected shifting

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  • w_kratzer Nov 15, 2009

    when problem first came up a few yrs ago, looked at toyota info at dealer, and started squirting wd 40 on all the linkage at the firewall and on right side of carb. seemedd to work for few months then would use wd again. last week shifting became intermediate into fourth gear which is overdrive, but this time squiring didt work. then as was getting ready to flush tranny, shifted into od for the trip, then when started again, no od.....any idea what i could have been squirting to make it shift??????? if i can pinpoint that can try focusing on that point. wondering if it could be vacuum leak from an old rubber hose in that area of which there are a bunch....

    to complicate this, i found the tranny pan bolts ...a couple, are sheared off, but pan doesnt leak. got a new tran filter, but to pull the pan is going to be a real project right now, so looking for other solutions until i get time and spaceand patience to attack the pan. cant risk screwing it up and not having a driver right now. Thanks for your input.


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There are many things that can cause the tranny to not shift properly and Vacume is one of them.

tranny sensors
low on fluid
tranny filter
dirty/used tranny fliud
loose linkage
worn transmission bands
valve body malfunction on the tranny
speed sensor

here are 90% of them. You just need to start with the basics first like tranny fluid and fliter. drop the pan and see whats there. If you have metal shavings its the bands or gears. while you have it apart remove the valve body and put a rebuild kit on it. If the valve body id gunked or leaking you can have much of the same issues.

Posted on Nov 15, 2009

  • Roger Campbell
    Roger Campbell Nov 15, 2009

    Well now I know all the info yes I do believe its a vacuum leak. WD 40 makes rubber swell. So the thing is that now the rubber has deteriorated or split so far it wont let it shift. You need to trace the lines out on that side. ANY vacuum leak will cause this. Its hard to say or even pin point what one is the problem. Hell just go to the auto parts store buy a roll of vacuum tubing and start replacing one at a time.


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