Lost reverse

Discussion in 'Troubleshooting & Diagnosis' started by Jerry M, Sep 3, 2020.

  1. Jerry M

    Jerry M Member

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    Hey! I’m back with another question about my car, I just swapped out a worn out 700r4 for a long cone turbo 350 out of a 74 c10 into my 1981 camaro. Car has a small block 305. Transmission was sitting a couple years so when I got it I changed fluid filter and gaskets, the pan had some clutch material but nothing unusual. On its first test drive I backed it out of the garage and did some laps around our property and then drove it to town with my father following me, it made it to town no problem, barely noticed it shifted into second but at 60mph I don’t expect it stayed in first, was running good when I pulled into a gas station and parked, we went inside and when I went to back out afterwards it wouldn’t move. Still had forward gears and neutral but no reverse, I can’t say 100% it had park as I was holding the brake anyway, but it was all of 10-15 minutes after I backed it out of the garage that it wouldn’t move in reverse. Any ideas?
     
  2. cadillac_al

    cadillac_al Veteran Member

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    I had a th350 lose reverse once. I didn't know what it was or how to fix it so I had to replace it.
     
  3. budro6968

    budro6968 Veteran Member

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    When you shift to low1 does it go? Probably just the seals went in the low reverse piston. 74 if never rebuilt is lucky to still work. Time for a rebuild.
     
  4. Jerry M

    Jerry M Member

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    Yeah it certainly still has low 1/2 but yeah I think it needs a pretty good rebuild.
     
  5. biker

    biker Veteran Member

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    Before you go to worst case scenarios, is the linkage still hooked up and/or properly indexed? If you just installed it, something may have wiggled it's way off.
     
  6. pomartin

    pomartin Veteran Member

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    You mentioned transmission was sitting for couple of years... I swapped my old 350 which also sat for long time.
    It was acting odd... sometimes it had reverse sometimes not, ahifting at extremely high RPM and so on...

    Well after swap I decided to just re-seal it completely (bought a kit without steels as internal components looked as new). Buddy tried it up and it works perfectly.

    My point being it could be that your inner seals need replacing
     

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