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Thread: 89 chevy 2500 wont go into overdrive

  1. #1
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    Question 89 chevy 2500 wont go into overdrive

    I bought a 89 silverado from my grandpa for $500, he said i'd have to get it running right though. My problem is that it wont go into overdrive, the truck just sits idle and will rev up as if it were still in neutral. When I put it in drive the truck will run but has a hard time shifting. A mechanic friend of mine said it's probably a sensor problem( at least for the overdrive). I'm not sure if the shifting is the same problem. Anyone have any ideas or things I can try?

  2. #2
    Forum Moderator Boudin's Avatar
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    I'm assuming you have the 700R4 transmission, right?

  3. #3
    Forum Moderator Boudin's Avatar
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    Sorry, I just noticed you said it was a 3/4 ton. I don't think the 700R4 would be in anything but a 1/2 ton.

    Do you know what transmission it has in it?

  4. #4
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    I would think so, sad to say this is my first older chevy truck so i'm still familiarizing myself with them. It's whatever came stock with it haha.

  5. #5
    Senior Member wyochimneysweep's Avatar
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    gas or diesel?

  6. #6
    Senior Member wyochimneysweep's Avatar
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    does reverse work

  7. #7
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    It's gas, it's got the 350 in it. It does go in reverse. All gears work fine except the drives, overdrive does nothing and drive struggles to shift.

  8. #8
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    89 chevy 2500

    Well, the '89 Chev. and GMC 3/4 vans definitely did have 700R4s in them. Got two. Also have an '89 Chev 1 ton van that has a T400 in it with the 350 TBI.

  9. #9
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    I've got an 89 k2500 with a rebuilt 700r4 in it that had the same symptoms. It's time for a trip to the transmission shop.

    GL, eric
    1988 K2500 5.7TBI (288K)
    1978 K20 292CI (16K)

  10. #10
    Senior Member wyochimneysweep's Avatar
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    sticking throttle vavle? they have a junior shift kit that will fix the stickie vavle.

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