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700r4's, pre and post 87

Discussion in 'The Garage' started by TXsizeK5, Feb 19, 2003.

  1. TXsizeK5

    TXsizeK5 1/2 ton status

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    700r4\'s, pre and post 87

    what was it that the 87+ 700's had that pre87 didnt that make it better? Thanks
     
  2. HarryH3

    HarryH3 1 ton status Author

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    Re: 700r4\'s, pre and post 87

    GM had a serious public relations issue with the early 700R4's. So many of them were failing that GM, under pressure, agreed to pay for any 700R4 that had been rebuilt in models up through 1986. The 1987 model had many upgrades to make it more reliable. There's probably a list of the upgrades out there somewhere, but the later model 700R4's are a much better tranny to start a buildup with.
     
  3. TXsizeK5

    TXsizeK5 1/2 ton status

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    Re: 700r4\'s, pre and post 87

    but if i had say a 85 700r4 and had it rebuilt anyway since im getting it free would it be reliable as if i got a 87 rebuilt?
     
  4. jeffro

    jeffro 1/2 ton status

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    Re: 700r4\'s, pre and post 87

    Early 700r4s has a smaller input shaft and less vanes in the oil pump. The oil drain port also need to be enlarged behind the front seal.
     

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