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overdrive

This is a discussion on overdrive within the Automatic Transmission forums, part of the Drivetrain category; i have a 94 z auto. i bought the car a few weeks ago and it had no overdrive. ireplaced ...

  1. #1
    Member luciangage's Avatar
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    overdrive

    i have a 94 z auto. i bought the car a few weeks ago and it had no overdrive. ireplaced it w/ a used one but it was no good. i decided to let my freind rebuild the one that was in the car. he is going to school for mechanics and is doing it there. i bought the kit from tci that has the exact same parts as their street fighter kit we put it back in and a shift kit. car shifts hard in a good way but still will not go into overdrive. this is my first trans experience so any ideas will be greatly appericiated

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    Member performabuilt's Avatar
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    Im assuming you have a 1994 z28 ?
    Ok in the 4l60e there could be several reasons for no fourth , First get it scanned for codes and then let everyone know what they are .
    performabuilt

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    Member luciangage's Avatar
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    it is a z28.2 codes#59 trans temp. circut high and #90 tcc enable fault(qdm) thanks

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    Member performabuilt's Avatar
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    trannsmission will not go into overdrive as long as those codes are there either will put it in hot mode and disallow od ,Also are you sure its a 94 trans?
    performabuilt

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    Member luciangage's Avatar
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    what causes these codes? sensors? how do you test? do i need a trans range pressure switch assembly? pressure control solenoid? what causes hot mode is there a solenoid for od? i vve got no idea about this stuff. im trying to learn thanks for being helpful and responsive

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    Member luciangage's Avatar
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    oh yeah car had reman trans in it when i bought it so car is 94 trans ??? it this a factor?

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    Member performabuilt's Avatar
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    Well the codes could be real codes caused but overheating due to tcc not locking , Or they could be ghost codes from a bad trans range presure switch , thats the hard part determining which , A technicial with a good scanner could easily make that determination by reading the data stream to see whats actually happening , If i was gonna guess though I would go with range presure switch ,
    performabuilt

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    Member luciangage's Avatar
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    so go ahead and replace it?

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    Member luciangage's Avatar
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    ok that didn't work so now what?

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    Member performabuilt's Avatar
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    wait a minute I just remembered something I ran into a couple years ago , We had a 1994 z28 come to the shop to have the unit replaced , So we replaced it with a unit built non pwm for a 1994 after we built it we had no fourth a quad driver failure and a trans temp sensor lockup code, just like yours ,
    The solution was to put the original transmissions internal wiring harness and solinods on it .After doing some research I learned a couple , under the dash we found there was not only a gm1 plug but and obd2 as well though it gave the obd1 gm1 code numbers and the obd2 plug didnt work ,
    to make the tranny work we had to use the wiring harness and solinods specifically the pwm solinoid from a 1995 year , Is there a prndle switch mounted to side of transmission where the linkage goes , black thing with two plugs on it ?
    performabuilt

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    Member luciangage's Avatar
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    no i dont have that plug and i dont have the original wiring either. however i do have the motor and trans out of a 94 caddy. this is what i was going to build for my car. i could use the wiring harness, solenoids, and computer on my car? iwould have to use lt1 edit or something but if you think it might work i can try it. thanks. oh yeah i bought an atsg manual so maybe this will help

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    Member performabuilt's Avatar
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    you do not need to swap out the car harness just the transmissions internal harness and solinoids .

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    Member luciangage's Avatar
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    and the computer?

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    Member luciangage's Avatar
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    changed out the trans wiring and solenoids nothing different do i need to put the other computer in the car?

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