Gear Vendors

Discussion in 'Transmission & Driveline Topics' started by BlueBaron762x39, Sep 11, 2018.

  1. BlueBaron762x39

    BlueBaron762x39 Veteran Member

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    Has anyone here installed a gear vendors overdrive unit in an f-body with a TH350? I recently purchased one for my 1979 Trans Am and thought the only modification I was going to have to do was shorten the drive shaft.
     
  2. ULTM8Z

    ULTM8Z Veteran Member

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    I'm expecting to do one next year. I think you have to notch the floor pan stiffener that runs over the tail housing.
     
  3. BonzoHansen

    BonzoHansen Administrator Lifetime Gold Member

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    When my friend put his in his 79 behind a 502/TH400 he had to cut most if not all of that brace going across that is just behind the trans.

    He loves that GV though.
     
  4. BlueBaron762x39

    BlueBaron762x39 Veteran Member

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    From what I've read so far, it seems that there is more work involved in installing a Gear Vendor on a TH400 than a TH350. I'm hoping little to no cutting will need to be done under the car (other than the drive shaft which will need to be shortened).
     
  5. BlueBaron762x39

    BlueBaron762x39 Veteran Member

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    The gear vendor is now installed. The modifications required included notching the floor pan brace, shortening the drive shaft, and shortening the TH350 transmission's output shaft.
     
  6. big gear head

    big gear head Veteran Member

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    I saw one for sale yesterday at the Louisville swap meet for $900 for a TH400.
     
  7. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    Do you have a photo of the notching involved?
    Was it even close to fitting without notching or was it an extensive notch?
     
  8. Fbird

    Fbird Veteran Member Lifetime Gold Member

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    an overdrive in a 79 BIRD....i would assume you have swapped the rear end gears? or loking to go 1000 mph TA's were typically geared like turds...2.56 or 2.73 gears ....3.08 for the "hot rod version....lol
     
  9. slayer021175666

    slayer021175666 Veteran Member

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    I'd like to see pics of the work involved, too.
     
  10. ULTM8Z

    ULTM8Z Veteran Member

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    No pics, but you have to remove that entire brace from the tunnel. A cut off wheel can make short work of it.

    I tried a "notch" but it the GV unit would still hit. It can move quite a bit with the rubber mount on the transmission. I tried a urethane mount to reduce movement, but resulted in too much vibration/noise into the cabin for my liking. Ultimately went back and removed the entire brace.

    Been running it for about a year now and no issues with that. But the GV is certainly one of the best mods I've ever done.
     

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